Geological classification

How to distinguish quartz from other minerals?

Incredible rock crystal, rich amethyst, deep rauchtopaz, delicate rose quartz and even mysterious agate – all this is just a small part of the subspecies of quartz rock. This mineral in various variations is used in the manufacture of medical lamps, the production of watch movements, as well as in light and heavy industry. Quartz jewelry is affordable, durable, and has incredible designs. The mineral is one of the most common in the world, but this does not prevent jewelers from creating exclusive jewelry with this stone.

General information about quartz stone

Quartz has a homogeneous structure, which allows it to be classified as a mineral. In the chemical industry, the mineral has a more respectable name – silicon dioxide. Raw quartz stone is oblong, hexagonal crystals of translucent shades. Quartz ranks fourth among the hardest minerals, behind diamonds, corundum and topaz. This characteristic allows the stone to be used in various fields, significantly making human life easier.

Quartz deposits

Since quartz is the most common mineral throughout the globe, its deposits can be found almost anywhere. Despite the fact that samples for industrial use are much more common than jewelry samples. Most of the gems used to create jewelry are mined in Australia, Brazil and America. The most famous deposits, dating back to ancient times, are located in Uruguay and Sri Lanka. This is where you can find ideal samples for transformation into jewelry masterpieces. Quartz is also mined in Ukraine. The eastern regions are rich in pink minerals, rock crystal is common in the northern part, but rauchtopaz can be found in the Zhitomir regions.

Varieties of quartz mineral

  • Rock crystal is a classic representative of the quartz family. This stone is completely transparent and does not have a pronounced shade. In jewelry, the mineral looks good in combination with colored precious inserts.
  • Amethyst is a deep purple gemstone. Shades can also vary from light purple to bright lilac. Earrings and rings with amethyst are popular among jewelry connoisseurs.
  • Agate – stones of various shades with beautiful layered patterns. In jewelry stores, jewelry with minerals in light blue tones predominate, as well as products with inserts made of black agate.

Quartz stone in jewelry, regardless of its type, looks very attractive. It is the wide range of varieties of stone that makes jewelry with this mineral so attractive for purchase.

Unique healing and magical properties of jewelry stone

Gold products even with the smallest quartz inserts have a positive effect on human health. You can choose any accessory as a medicinal decoration, each of which will have a positive effect on the body.

For example, a mineral, which is presented in the form of a pendant, speeds up the recovery process from colds and reduces sore throat. The stone can cure diseases of the respiratory system; it is also used to prevent influenza and ARVI.

According to many years of observation by our ancestors, it is even possible to obtain healing water from quartz, which has a unique wound-healing and rejuvenating effect. To prepare such water, you need to infuse it with this mineral for some time. The resulting liquid heals wounds and cuts faster and is good for burns and damaged skin.

After regular washing with quartz water, there is an increase in skin elasticity, it becomes more elastic, and a healthy glow appears.

The most healing properties are inherent in rock crystal, smoky and rose quartz, as well as amethyst. Minerals can relieve stress and insomnia, improve mood, stabilize blood pressure, increase visual acuity, and get rid of bad habits.

Separately, we can highlight the magical properties of quartz, which are clearly manifested by owners of jewelry with this mineral.

  • Rock crystal is used in magical rituals. The energy of the stone is as similar as possible to human energy, due to which it has a positive effect on our psychological state and thoughts.
  • Agate helps in decision making, protects the owner from the evil eye and bad influence.
  • Amethyst has a beneficial effect on mood, promotes relaxation and normalization of sleep.
  • Rauchtopaz relieves irritability, allows you to control emotions and neutralizes negativity coming from other people.
  • Beautiful rose quartz stone is a symbol of love and fidelity. The mineral protects love and family relationships from quarrels and adversity, helps you meet your destiny and maintain passion in marriage.

Regardless of which piece of jewelry with a quartz insert is chosen, the product is guaranteed to bring aesthetic pleasure and a great mood to its owner.

Who is suitable for jewelry with quartz – affordable models for everyone

These stones are not as expensive as diamonds and are therefore much more accessible. But these stones can offer much more color options and richness of designs than the same diamond.

Unique, beautiful and exquisite quartz has long captivated the hearts of many jewelry lovers and has found wide application in the jewelry industry. Rings with quartz, pendants and even earrings with quartz – the choice of products with this mineral is really very large and varied. Due to its genuine brilliance and clarity, which seems to captivate and captivate, quartz jewelry is in great demand.

Who is quartz suitable for? Thanks to the wide variety of colors, shapes and subspecies, everyone can find a suitable specimen for themselves. If you turn to the jewelry horoscope, you can find out that rock crystal is ideal for Leo, Taurus, Pisces and Libra. Scorpios and Capricorns can choose Rauchtopaz for themselves, and the pink stone is recommended for dreamy Virgos.

Quartz stone. Five interesting facts

  1. Quartz (quarts) is translated from German as solid. On the Mohs scale, stone has a hardness rating of 7,5, while the hardest mineral, diamond, is rated at 10.
  2. Pure, natural quartz has no color, it is almost transparent. An admixture of other minerals adds a certain shade to the stone.
  3. Blue stones are not found in nature; such specimens are created artificially.
  4. Scientists have proven that quartz is present not only on our planet, but also on some asteroids.
  5. Quartz was popular with many ancient prominent personalities. Sunglasses were found in the tomb of Tutankhamun, which were made from morion, a type of quartz. And the Emperor of Rome, Nero, used rock crystal cubes to cool his favorite drinks.

Quartz is one of the most common minerals in the earth’s crust, the rock-forming mineral of most igneous and metamorphic rocks. Free content in the earth’s crust is 12%. It is part of other minerals in the form of mixtures and silicates. In total, the mass fraction of quartz in the earth’s crust is more than 60%.

Origin of name.

The word “quartz” is a calque of the German word Quarz, which comes from the Middle High German twarc, which means “solid.” The word has Slavic roots; in the Proto-Slavic language it has the form *tvьrdъ. According to other sources, the name comes from him. Querklufterz, Quererz – “ore of cutting veins.”

Morphology.

Quartz crystals are hexagonal prisms, topped at one end (rarely at both) with a six- or three-sided pyramidal head, combining the faces of two rhombohedrons. Often, towards the head, the crystal gradually narrows. The faces of the prism are characterized by transverse shading. Quartz single crystals can have right-handed and left-handed shapes.

In igneous and metamorphic rocks, quartz forms irregular isometric grains intergrown with grains of other minerals; its crystals are often encrusted with voids and almonds in effusive rocks.

In sedimentary rocks – nodules, veinlets, secretions, brushes of small short-prismatic crystals on the walls of voids in limestone, etc. Also fragments of various shapes and sizes, pebbles, sand.

Properties.

In its pure form, quartz is colorless or has a white color due to internal cracks and crystalline defects. Impurity elements and microscopic inclusions of other minerals, mainly iron oxides, give it a wide variety of colors. Among the color varieties of quartz are almost black morion, violet (amethyst), yellow (citrine), etc. The reasons for the color of some varieties of quartz have their own specific nature. Artificial crystals are also given green (very rare in nature) and blue (there are no natural analogues) colors.

The luster is glassy, ​​sometimes greasy in solid masses, the fracture is uneven or conchoidal. There is no cleavage.

Quartz often forms twins. There are many laws of twinning, the main ones being the Brazilian and Dauphine laws.

Melting point 1713–1728 °C (due to the high viscosity of the melt, determining the melting point is difficult; there are different data). Dielectric, piezoelectric.

Minerals and varieties of quartz.

  • Aventurine – yellowish or shimmering brownish-red quartzite (due to inclusions of mica and iron mica).
  • Agate – layered-banded variety of chalcedony.
  • Amethyst – purple.
  • Ametrine – bicolor, violet-yellow.
  • Binghamite – iridescent quartz with goethite inclusions.
  • Hairy – rock crystal with inclusions of fine needle crystals of rutile, tourmaline and/or other minerals forming needle crystals.
  • Rhinestone – crystals of colorless transparent quartz.
  • Flint – fine-grained cryptocrystalline silica aggregates of variable composition, consisting mainly of quartz and to a lesser extent chalcedony, cristobalite, sometimes with the presence of a small amount of opal. Usually found in the form of nodules or pebbles that arise when they are destroyed.
  • Lemotrin – bicolor yellow-brown.
  • Morion – the black.
  • Prazem – green (due to actinolite inclusions).
  • Prasiolite – onion-green, obtained artificially by calcining yellow quartz.
  • Rauchtopaz (smoky quartz) – light gray or light brown.
  • Rose quartz – pink.
  • Chalcedony – cryptocrystalline fine-fiber variety. Translucent or translucent, color from white to honey yellow. Forms spherulites, spherulite crusts, pseudostalactites or continuous massive formations.
  • Citrine – lemon yellow.
  • Sapphire quartz – bluish, coarse-grained quartz aggregate.
  • Cat’s eye – white, pinkish, gray quartz with a light tint effect.
  • Hawkeye – silicified aggregate of bluish-gray amphibole.
  • Eye of the Tiger – similar to the hawk’s eye, but golden brown in color.

Origin.

Quartz is formed during various geological processes: Directly crystallizes from acidic magma. Quartz contains both intrusive (granite, diorite) and effusive (rhyolite, dacite) rocks of acidic and intermediate composition, and can be found in igneous rocks of basic composition (quartz gabbro). According to measurements using geobarothermometry methods, quartz is released in granites at T>700 °C (analysis by melt inclusion method, isotope geothermometry). In acidic volcanic rocks it often forms porphyry phenocrysts. The temperature of its release can exceed 1000 °C.

Quartz crystallizes from fluid-enriched pegmatite magmas and is one of the main minerals of granitic pegmatites. Quartz is the main mineral of apogranitic metasomatites – greisens.

During the hydrothermal process, quartz and crystal-bearing veins are formed. Beautiful geodes made from quartz minerals, often with an agate shell, are not uncommon.

Widely distributed in sedimentary strata, often found in limestones, dolomites and other rocks in the form of nodules, geodes, fine-crystalline crusts and veinlets in cracks. When weathered under surface conditions, quartz is stable and accumulates in placers of various origins (coastal-marine, aeolian, alluvial, etc.) in the form of rounded pebbles. The main mineral of sands and sandstones, and deposits of monomineral quartz sands are of great industrial importance.

In industry, quartz is synthesized using the hydrothermal method. The advantage of synthetic quartz for industry is greater uniformity of impurities and higher chemical purity. Another advantage of the synthesis method is that the result of growth is single crystals, which in their properties are more suitable for use as piezo-optic quartz than twinned crystals, which are widespread in nature. For the jewelry industry, the synthesis method is also important, since it makes it possible to obtain quartz of almost any color, of very different saturations, if necessary, even with transitions from one color to another. They even grow blue quartz (perunite), which does not exist in nature.

Practical significance.

Valuable mineral raw materials: used in optical instruments, in ultrasound generators, in telephone and radio equipment (as a piezoelectric), in electronic devices (“quartz” in technical slang is sometimes called a quartz resonator – a component of devices for stabilizing the frequency of electronic generators). It is consumed in large quantities by the glass and ceramics industries (rock crystal and pure quartz sand). It is also used in the production of silica refractories and quartz glass. Many varieties are used in jewelry.

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