History of use

What mineral composition does Diorite have?

Diorite (fr. diorite , other Greek διορίζω – differentiate, distinguish) – igneous intrusive rock, average composition, normal alkalinity. It consists of plagioclase (andesine, less commonly oligoclase-andesine) and one or more colored minerals, most often common hornblende. Biotite or pyroxene are also found. About 30% non-ferrous minerals. Sometimes quartz is present, in which case the rock is called quartz diorite. In terms of silica content (SiO2 52-65%) it is classified as a rock of medium composition. According to the sum of alkalis (Na2O+K2O 3-7,5%) to the normal range.

Mineral composition

The main minerals are medium plagioclase (andesine or oligoclase), hornblende, less commonly augite and biotite, quartz, and potassium feldspar is sometimes present. Accessory minerals are represented by titanite, apatite, magnetite, ilmenite, and zircon.


Color. Usually dark green or brown-green. Structure. Holocrystalline, uniformly crystalline, from fine- to gigantic-grained. Texture. Massive. Specific weight. 2,7-2,9 Form of occurrence. Stocks, veins, laccoliths and other intrusive massifs. Diorites often occur together with granites, composing separate phases of intrusion of complex batholiths. separateness. Layered, parallelepipedal. Diagnostics. The color of diorite is lighter than that of gabbro, sometimes they have a completely leucocratic appearance.

Practical meaning

Serves as a building material, used for cladding buildings, making vases, table tops, pedestals, etc. In Ancient Egypt and ancient Mesopotamia it was also used as a sculptural material. A set of laws was carved on a stele made of black diorite. The Code of Laws of Hammurabi is the oldest surviving collection of laws. Gold-bearing quartz veins often develop in association with diorites.

Place of Birth

North America (Cordillera). Distributed in Great Britain, Central Asia (Kazakhstan), Russia (Urals, for example Sangalyk diorite deposit, Black Sopka), and in other areas of the world.


There are varieties: quartz, quartz-free, hornblende, augite and biotite diorites.


  • Diorite on the Geowikipedia website
  • Igneous rocks

Wikimedia Foundation. 2010.


See what “Diorite” is in other dictionaries:

  • DIORITE — Rock, dark green in color, common in many countries of Europe and America; consists of felsic plagioclase and hornblende or biotite, and often quartz. Dictionary of foreign words included in the Russian language. Chudinov A.N., 1910 . Dictionary of foreign words of the Russian language
  • Diorite – deep magma. n., consisting of plagioclase (andesine, less often andesine oligoclase) and one or more colored minerals, most often common hornblende. Biotite or pyroxene also occurs. About 30% of colored fish. Sometimes present. . Geological Encyclopedia
  • DIORITE – an intrusive medium rock, consisting mainly of medium plagioclase and hornblende, sometimes augite and biotite, less often quartz (quartz diorite). Density 2700 2900 kg/m³. Construction material; some varieties of decorative stones . Big Encyclopedic Dictionary
  • DIORITE – DIORITE, an intermediate coarse-grained igneous rock, similar in texture to GRANITE, but composed mainly of plagioclase and hornblende combined with biotite or augite. Usually diorite has a dark gray color . Scientific and technical encyclopedic dictionary
  • DIORITE – husband. a rock consisting of fine-grained diabase. Dahl’s Explanatory Dictionary. IN AND. Dahl. 1863 1866 . Dahl’s Explanatory Dictionary
  • diorite — noun, number of synonyms: 1 • breed (278) ASIS Dictionary of Synonyms. V.N. Trishin. 2013 . Dictionary of synonyms
  • diorite – a, m. diorite
  • diorite — Gray or dark gray intrusive rock of intermediate composition, consisting of medium plagioclase, hornblende, sometimes biotite and augite, less often quartz. [Dictionary of geological terms and concepts. Tomsk State University] Topics. . Technical Translator’s Guide
  • DIORITE – intrusive igneous rock of intermediate composition. The color is dark gray or grey. Consists mainly of plagioclase, represented by basic oligoclase or andesine, and hornblende; in small quantities it may contain. . Collier’s Encyclopedia
  • diorite – an intrusive medium rock, consisting mainly of medium plagioclase and hornblende, sometimes augite and biotite, less often quartz (quartz diorite). Density 2,7 2,9 g/cm3. Construction material; some varieties of decorative stones. * * * … Encyclopedic Dictionary
  • Feedback: Technical support, Advertising on the site
  • Travel

Exporting dictionaries to sites made in PHP
WordPress, MODx.

  • Mark text and shareSearch in the same dictionarySearch synonyms
  • Search in all dictionaries
  • Search in translations
  • Search on the InternetSearch in the same category

The name of this mineral comes from the Greek word diorizo, which means “discern.” This association arose due to the so-called mottled texture, in which the constituent minerals are clearly visible. Diorite is a deep-seated volcanic rock and often occurs in association with granites.

Diorite formation

As a rule, diorites occur in the form of veins, stocks, laccoliths and other intrusive massifs. Gold-bearing quartz veins often appear together with diorite. Diorite may contain minerals such as ilmenite and magnetite. Diorite is a deep-seated rock that was formed as a result of the cooling of hot magma. This process is quite slow and occurs deep in the earth’s crust. Since diorite is very close in composition to granites, this mineral (or its varieties) is often classified as granitoids, but diorite will differ from them in quartz content: for example, granite will contain a high number of quartz inclusions, and diorites will very rarely contain more than 20 %. If there are more quartz inclusions, then such minerals are considered to be granodiorites (or quartz diorite). If the rock contains a high content of orthoclase, then this variety is called tonalite.

Diorite and its features

Traditional diorite consists of acidic plagioclase (this can be andesine or oligoclase), as well as a small amount of hornblende inclusions. Diorite is characterized by a uniform texture and coarse-grained formations. The structure is crystalline-granular. The color of diorite differs in dark gray, greenish-gray or brownish-green shades. There may also be darker colors – brown-green, dark emerald, and also gray or smoky (ashy) shades.
Paleophyre is another variety of diorite that contains hornblende. This stone is characterized by a full-crystalline structure. Kersanites are more vein stones, the structure of which contains biotite in combination with acidic plagioclase or quartz. Quartz diorite has a holocrystalline, porphyritic or coarse-grained structure. It contains more than 55-65% plagioclase and, as a rule, no feldspar at all. The composition of quartz diorite may include such dark-colored minerals as hornblende, augite, biotite and others. This rock rarely forms independent massifs; as a rule, quartz diorites are formed in complex massifs together with diorites, or in the form of stocks, dikes and other bodies with an irregular shape.

Applications of diorite

When compared with granite, diorite will have slightly lower strength and is not as resistant to mechanical stress or damage. Therefore, diorite, as a rule, is not used in construction, for creating sculptures or for cladding. However, diorite is suitable for use in road construction as road stone or crushed stone. Note that this stone is resistant to weathering and can be polished quite well. But the polished surface will have a slightly greasy shine – not as mirror-like as, for example, polished marble or granite surfaces. Higher quality diorite has a fine-grained structure and minimal mica content. Diorite screenings are a good filler for asphalt concrete mixtures, as they increase the water resistance, durability and strength of the resulting concrete. In landscape design, diorite is used to create rock gardens and stone gardens, as well as for paving paths.

Diorite deposits

Diorite is mined in America (Cordillera, Vermont, California), Finland, Sweden, Poland and France. There are also known deposits of diorite in Great Britain, Central Asia and Russia (Urals). Large deposits of diorite of industrial importance are very rare. Diorite is also mined in Peru, Georgia, Norway and Chile.

This entry was posted in Natural stone. Bookmark the permalink.

  • Fake diamond
  • Value
  • A natural stone

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button