How is calcite different from quartz?

Text of the scientific work on the topic “COLLECTION SAMPLES OF QUARTZ AND CALCITE FROM THE DALNEGORSK DEPOSITS IN THE FEGI MUSEUM”

VeibUk IG Komi SC UB RAS, April, 2019, No. 4 Chronicle, events, facts • Chronicle, events, facts COLLECTION QUARTZ AND CALCITE SAMPLES FROM DALNEGORSK DEPOSITS IN THE FEGI MUSEUM Dalnegorsk quartz and associated calcite are the brightest examples of diverse processes of mineral formation of individuals and aggregates of the same minerals within one deposit or within a group of similar deposits. Collection samples from the museum exposition illustrate a wide variety of rare forms of quartz and calcite crystals faceting, the presence of several generations in one sample, evidence of simultaneous and sequential crystas growth, different stages of splitting, and numerous mineral associations forming druse intergrowths. The future of stones is not in their value, not in the wealth invested in them, but in their beauty, in the harmony of colors, colors and shapes, in their eternity. Collectible minerals are unusual, rare mineral individuals and crystalline aggregates that found themselves in free conditions that allowed them to adopt an external cut specific to each mineral type—a crystal. The exposition of the FEGI Museum contains more than five hundred such exhibits, and it is replenished with crystals, intergrowths and druses from deposits of Primorye. The largest portion of revenues traditionally comes from the Dalnegorsky district, which is still of great interest today as a source of collectible mineral raw materials. This is due to the presence of a large number of open cavities for the crystallization of minerals, the multi-stage and multi-stage genesis of mineralization, and the spatial combination of mineral aggregates of different ages. These cavities contain forms that indicate both fast (spherulitic, dendritic and skeletal) and slow growth (so-called recrystallization drusen) [2]. Most of the collection samples of quartz and calcite on display in the museum are from polymetallic deposits Nikolaevskoye, Verkhnee, Sovetskoye-2 and Photo 1. Drusen of “bipyramidal” quartz crystals (10x7x4 cm). Dalnegorsk, Sovetskoye-2 field. Photo by T. Knyazeva Photo 1. Druse of “dipyramidal” quartz crystals (10x7x4 cm). Sovetskoye-2 deposit, Dalnegorsk. Photo by T. Knyazeva borosilicate deposit Bor. Collectible samples from the museum exhibition, presented in photographs, illustrate a wide variety of crystal cutting shapes, signs of simultaneous and sequential growth of minerals, numerous mineral associations that form drusy intergrowths with quartz and calcite. In the skarns of polymetallic Dalnegorsk deposits, three morphological varieties of quartz are observed: long-prismatic, short-prismatic “bipyramidal” habit (photo 1) and fine-crystalline crusts formed on the ascending faces of first-generation quartz or other minerals. Quartz, often associated with calcite, is interesting not only for its variety of crystalline forms. Quartz of different habit in deposits of Dalnegorsk is found in association with many minerals, including ore minerals (photo 2), often growing on them in the form of a crown or druse crust. Intergrowths of long-prismatic (acicular) crystals of quartz and papirspar are often overgrown with sulfide druses (photo 3). Photo 2. Drusy intergrowth of prismatic crystals of quartz, galena and pyrrhotite with subsequent growth of fine-crystalline cubic pyrite and colorless rhombohedral calcite (10x5x5 cm). Dalnegorsk, Nikolaevskoye field. Photo by T. Knyazeva Photo 2. Druse intergrowth of prismatic quartz crystals, galena and pyrrhotite with subsequent growth of fine-crystalline cubic pyrite and colorless rhombohedral calcite (10x5x5 cm). Nikolaevskoye deposit, Dalnegorsk. Photo by T. Knyazeva Âecrnmtc IG Komi Scientific Center Ural Branch RAS, April, 2019, No. 4 Particularly impressive are the prismatic quartz crystals overgrown with pyrite (photo 4). Coal-black crystals of ilvaite with glossy edges, which made the Dalnegorsk deposits famous (it is almost never found in the form of crystals in other deposits), contrast perfectly with the associated quartz and calcite (photo 5). In addition, quartz often has numerous inclusions. At the Nikolaevskoye and Sovetskoye-2 deposits, pinkish-red quartz is found, colored by inclusions and scaly hematite deposits (photo 6), and transparent pyramidal-prismatic crystals, saturated with black hematite inclusions (photo 7). Mineralized cavities in the Bor deposit are developed as widely as in polymetallic deposits, and belong to the same genetic type, but differ in mineral composition. Therefore, quartz here is observed in association with other minerals (in addition to calcite, these are datolite, danburite and apophyllite) and forms other morphological forms. In cavities with drusy aggregates of quartz and calcite at the deep horizons of the Bor deposit, amethyst-like quartz is found in wollastonite skarns. Scepter-shaped (photo 8) and multi-headed quartz crystals are known. The so-called sawn quartz, revealed Photo 3. Aggregate of galena, sphalerite and pyrite, overgrown with fine-needle quartz and papirspar (28x20x18 cm). Dalne-gorsk, Nikolaevskoye field. Photo by T. Knyazeva Photo 3. Aggregate of galena, sphalerite and pyrite, overgrown with fine-acicular quartz and calcite-“papierspath” (28x20x18 cm). Nikolaevskoye deposit, Dalnegorsk. Photo by T. Knyazeva Photo 4. Druses of long-prismatic quartz crystals with pyrite powder. Autoepitaxy of papierspar on rhombohedral calcite (crystallized to quartz) (21x18x13 cm). Dalnegorsk, Nikolaevskoye field. Photo by Yu. T. Vaskovsky Photo 4. Druse of long-prismatic quartz, overgrown by cubic crystals and films of pyrite. The colorless calcite-“papierspath” autoepi-taxially overgrow the rhombohedral calcite crystal. Nikolaevskoe deposit, Dalnegorsk. (21x18x13 cm). Photo by Y. Vas’kovskyi. found in leaching cavities in quartz pockets and in tectonic cavities, represents intergrowths of prismatic transparent crystals of quartz and papierspar that grew simultaneously (photo 9). The Bor deposit is known for quartz pseudomorphs of calcite. The most interesting are the complete ones Photo 5. Fine-crystalline ilvaite on the ascending faces of long-prismatic quartz crystals (14x11x6 cm). Dalnegorsk, Verkhneye deposit. Photo by Yu. T. Vaskovsky Photo 5. Fine-crystalline ilvaite aggregate accumulated on the upward faces of long-prismatic quartz crystals (14x11x6 cm). Verkhneye deposit, Dalnegorsk. Photo by Y. Vas’kovskyi. Photo 6. Split quartz crystal in the “jacket” of dick-kit-antigorite (MiniFlex2 X-ray diffractometer). Colored with inclusions and flakes of hematite (MiniFlex2) (14x5x5 cm). Dalnegorsk, Sovetskoye-2 field. Photo by T. Knyazeva Photo 6. Split quartz crystal in a “jacket” of dikkit-antigorite (X-ray diffractometer MiniFlex2). Painted with inclusions and scaly hematite secretions (MiniFlex2) (14x5x5 cm). Sovetskoye-2 deposit, Dalnegorsk. Photo by T. Knyazeva Photo 7. Druze of pyramidal-prismatic quartz with inclusions of hematite crystals (ICS) (13x10x6 cm). Dalnegorsk, Sovetskoye-2 field. Photo by G. Grishin Photo 7. Druse of pyramidal-prismatic quartz with inclusions of hematite crystals (Infra red spectroscopy) (13x10x6 cm). Sovetskoye-2 deposit, Dalnegorsk. Photo by G. Grishin Vestnik IG Komi SC UB RAS, April, 2019, No. 4 quartz pseudomorphs on large (35–40 cm) danburite crystals that have retained their shape. Particularly valued as collection material are the tube-shaped pseudomorphs of rock crystal and paper spar on dan-burite, indicating that the replacement and leaching of danburite occurred simultaneously (photo 10). An outstanding feature of Dalnegorsk calcite is its unique rare forms of crystal cutting. The Verkhnee deposit is best known for its wide variety of calcite: from acicular, formed by the faces of an acute scalenohedron Photo 8. Druse of scepter-shaped quartz crystals (8x7x6 cm). Dalnegorsk, Bor deposit. Photo by V. G. Sazonov Photo 8. Druse of sceptre quartz crystals (8x7x6 cm). Bor deposit, Dalnegorsk. Photo by V. Sazonov Photo 9. “Sawed” quartz and datolite with papirspar (7x5x4 cm). Dalnegorsk, Bor deposit. Photo by Yu. T. Vaskovsky Photo 9. “Cut” quartz crystals and datoli te with calcite-“papierspath” (7x5x4 cm). Bor deposit, Dalnegorsk. Photo by Y. Vas’kovskyi Photo 10. Pseudomorphosis of rock crystal and papierspar on danburite (10x7x5 cm). Dalnegorsk, Bor deposit. Photo by V. G. Sazonov Photo 10. Rock crystal and calcite-“papierspath” pseudomorph after danburite (10x7x5 cm). Bor deposit, Dalnegorsk, Photo by V. Sazonov in combination with a prism to split dendrites. Some examples of colorless transparent, white, pink and brownish-brown calcite, forming druses and complex intergrowths, are among the best in the world in terms of richness of shapes and quality. The morphological diversity of calcite is explained by the many combinations of simple forms that form crystals and aggregates, the processes of leaching and splitting, the presence of several generations in one cavity, as well as the frequent change of habit forms during the formation of subsequent generations of the mineral. For example, in one sample three generations of calcite are demonstrated (photo 11): on a massive spine-rhombohedral calcite base (first generation), pinkish split rhombohedral calcite is later (third generation) than the previously formed tubular intergrowths of crystals composed of the finest papierspar (second generation ). Similar hollow formations were noted in zones of partial leaching and recrystallization [3]. On the walls of the calcite cavity of the Verkhnee deposit, known for a wide variety of calcite, the following were discovered: intergrowths of classical calcite scalehedrons with multi-headed growth forms; dendrites of split scalenohedra of pink calcite (photo 12); rare unique calcite crystals with growth splitting like a spherocrystal; spherocrystalline forms, reminiscent of cauliflower, formed due to the denser growth of comb dendrites. The formation of such complex crystals, which are transformed into aggregates during the cleavage process, could occur due to rapid crystallization during the early stages from a supersaturated mother solution containing suspended particles that can create cleavage centers [1]. Despite many observations, no patterns have been identified in the distribution of morphological varieties within the deposits; there are only differences in the predominance of mineral forms in each deposit [4]. Scalenohedral and split Photo 11. “Bud” of a pinkish split rhombohedral calcite crystal on an aggregate of previously formed tube-shaped hollow calcite deposits (0.5-1 cm in elongation), folded with the thinnest paper spar (20x17x12 cm). Dalnegorsk, Sovetskoye-2 field. Photo by Yu. T. Vaskovsky Photo 11. A pinkish “bud” of split calcite rhombohedral crystal on the earlier formed aggregate of hollow-tubular calcite (0.5—1 cm), composed by superfine calcite-“papierspath” (specimen size is 20x17x12 cm). Sovetskoye-2 deposit, Dalnegorsk. Photo by Y. Vaskovskyi. Secmícoc IG Komi Scientific Center Ural Branch RAS, April, 2019, No. 4 Photo 12. Dendrites of split scalenohedra of pink calcite (15x15x13 cm). Dalnegorsk, Verkhneye deposit. Photo by Yu. T. Vaskovsky Photo 12. Dendrites of split scalenohedrons of pink calcite (15x15x13 cm). Verkhneye deposit, Dalnegorsk. Photo by Y. Vaskovskyi Photo 13. Calcite. Autoepitaxy during a change in habit forms—oriented overgrowth of acute rhombohedral calcite of the late generation of split scalenohedra of the early generation. Iron hydroxide shielding film (IOX) (15x15x10 cm). Dalnegorsk, Nikolaevskoye field. Photo by V. A. Solyanik Photo 13. Calcite. Autoepitaxia with changing of habit forms – oriented overgrowth of early generation split scalenohedrons by late generation sharp-rhombohedral calcite. Iron hydroxide shielding film (Infra red spectroscopy) (15x15x10 cm). Nikolaevskoye deposit, Dalnegorsk. Photo by V. Solyanik forms of calcite are almost never found in the “vents” of the Nikolaevskoye and Bor deposits, which are characterized by rhombohedral crystals. These crystals form drusy intergrowths with quartz, fluorite and other minerals or participate in the recrystallization of early tabular calcites. Papirspat is typical for the Sovetskoye-2 and Bor deposits, but is rare in Nikolaevskoye and almost never occurs in Verkhny. For the Sovetskoye-2 and Nikolaevskoye fields, the Photo 14. Druse of papierspar crystals (“flowering branch”) on a quartz-sulfide substrate. (23x12x10 cm). Dalnegorsk, Sovetskoye-2 field. Photo by Yu. T. Vaskovsky Photo 14. Druse of calcite-“papierspath” crystals (“flowering branch”) on a quartz-sulphide substrate. Dalnegorsk, Sovetskoye-2 deposit. Photo by Y. Vas’kovskyi We have a combination of a prism with an obtuse rhombohedron and auto-epitaxy of calcite with a change in habit forms, when oriented overgrowth of acute rhombohedral calcite of the late generation of scaleno-hedrons of an earlier generation occurs (photo 13). An important role in changing the habit of a crystal is often played by a screening film on the surface of its faces, which slows down their growth compared to other faces. Calcite of acute rhombohedral cut is found in all deposits. It crystallized in the last post-ore stage of mineralization. Sometimes drusy intergrowths of calcite crystals create spectacular shapes resembling flowers. In the museum’s collection this is a “flowering branch” formed by papierspar calcite (photo 14), pink split acute rhombohedral calcite forming a “rose” (photo on the cover), etc. The museum exhibition of collectible minerals is of great value both in scientific, educational and aesthetic terms. Work on the classification and description of various forms of mineral release and their drusy intergrowths in order to clarify the history of their growth and the sequence of mineral release continues. 1. Grigoriev D. P., Zhabin A. G. Ontogeny of minerals: individuals. M., Nauka, 1975. 339 p. 2. Grigoriev D.P., Kapitonov M.D. Two types of mineral drusen. Reports of the USSR Academy of Sciences. 1953. Volume 89. No. 3. P. 543-545. 3. Grant R, and Wilson WE 2001. Famous mineral localities: Dal’negorsk, Primorskiy Kray, Russia. Mineralogical record, Vol. 32 (1), pp. 3-30. 4. Moroshkin V. and Frishman N. 2001 Dalnegorsk: Notes on Mineralogy. Moscow, Ocean Pictures Ltd., Mineralogical Almanac, Vol. 4, 136 pp. Responsible for the release: Publisher editors: O. V. Gabova, K. V. Ordin (English) Computer layout: E. V. Antropova R. A. Shuktomov Seid. o reg. media PI No. FS77-75435 dated April 19.04.2019, 31.05.2019, issued by Roskomnadzor. Printed: 60/84/1. Paper size 8×6 140/1109. RISO stamp. Conditional p.l. 167982. Circulation 54. Order 8212. Founder: Federal State Budgetary Institution Federal Research Center Komi Scientific Center Ural Branch of the Russian Academy of Sciences. Editorial office, publishing house, printing house: publishing and information department of the Institute of Geology of the Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences. Address: 24, Komi Republic, Syktyvkar, Pervomaiskaya, 51. Tel.: (60) XNUMX-XNUMX-XNUMX. Email mail: vestnik@geo.komisc.ru Photos used on the cover: N. Koealchuk, E. Kushmanoeoi, Y. Golubeeoi, Y. Glukhoea Forum for students, applicants for geological specialties and geologists.

Quartz with calcite?

there are a lot of questions like: identify a rock or mineral from a photograph. Or maybe it’s a meteorite?
Identifying minerals from amateur photographs is a fun sport, but sometimes even this is possible. Therefore, we have created a separate thread for such questions. Moderator: Paul 8 messages • Page 1 of 1 Lex Member Messages: 9 Registered: Fri Oct 20, 2006 10:51 pm From: moscow Contact Information:

Quartz with calcite?

Message Lex » Fri Jan 19, 2007 10:59 pm I made quartz cabochons with “calcite” inclusions from purchased crystals and posted them on LiveJournal. And they scolded me, completely categorically informing me that there could be no inclusions of calcite in quartz because there could never be. Different growth conditions, antagonism. and so on. I don’t know much about gemology and mineralogy, and therefore I don’t know who is right. Tell me, please. And what could it be if not calcite? I am sure that this is nature. Having held in your hands the raw materials from which these cabochons are made, you can say this with complete confidence. Pavel Site Admin Messages: 604 Registered: Fri Jun 09, 2006 6:59 pm From: Moscow State University, Geological Faculty Contact Information: Message Paul » Sat Jan 20, 2007 11:18 am The pink crystals in the top right photo look like some kind of zeolite, such as stilbite. Can you take a close-up photo of one cabachon so you don’t have to break your eyes looking at the shape? Pavel Site Admin Messages: 604 Registered: Fri Jun 09, 2006 6:59 pm From: Moscow State University, Geological Faculty Contact Information: Message Paul » Sat Jan 20, 2007 11:19 am I meant the top left cabochon Pavel Site Admin Messages: 604 Registered: Fri Jun 09, 2006 6:59 pm From: Moscow State University, Geological Faculty Contact Information: Message Paul » Sat Jan 20, 2007 11:41 am I briefly described stilbite here. And the white one could be apophyllite, but it’s hard to see. Pavel Participant Messages: 10499 Registered: Mon Jun 12, 2006 4:31 pm From: Krasnoyarsk Contact Information:

Re: Quartz with calcite?

Message Paul » Sat Jan 20, 2007 1:08 pm “And they scolded me, completely categorically informing me that there could be no inclusions of calcite in quartz because there could never be.” Hm. I don’t know what exactly you have there, because it’s hard to determine closely, but don’t pay attention to the scolders. Carbonates are found in quartz. As well as vice versa. To be truthful, you need to know very well what a lie is and always be able to distinguish it from the truth.
Nikolai Ivanovich Sladkov Lex Member Messages: 9 Registered: Fri Oct 20, 2006 10:51 pm From: moscow Contact Information: Message Lex » Sun Jan 21, 2007 12:11 am Enlarged version And a few additions:
1. The material is soft and loose. Inclusions crumble with a fingernail.
2. The sellers of raw materials (Latin Americans) said that it was quartz with calcite. Perhaps they said something else, but I didn’t understand correctly, since we communicated in English, which we both know with a C grade.
3. It’s not that they scolded me too much. Rather, they tried to explain that there cannot be calcite inclusions in quartz. It turned out that they indicated that my incompetence led to misinformation for the cabochon buyer. And here it’s impossible not to pay attention. We need to figure it out. Perhaps I’m actually wrong. So I need to find out whether calcite is found in quartz? The crystals (raw materials, that is) were souvenirs – with polished edges. Inclusions also grew on the polished edges. They grew on the surface, “eaten” shallowly, and did not penetrate into the thickness. Only by “phantomism”, where it exists. Pavel Participant Messages: 10499 Registered: Mon Jun 12, 2006 4:31 pm From: Krasnoyarsk Contact Information: