![]() And even can from masses of rocks ( sandstone) composed of quartz grains only. It is highly resistant to weathering ( 7 on the Mohs scale) and tends to concentrate on sandstones and other detrital rocks. You can find it in acid igneous, metamorphic, and sedimentary rocks. Quartz occurs in nearly all types of rocks and geological environments. If you are interested in checking out the most beautiful quartz you can find them by clicking here (Amazon links) or here (). This variety of quartz forms two ended crystals and resembles the diamond’s outline. The Quartz family even has its own ‘diamond’, which name is the Herkimer diamond. Quartz is even found in meteorite craters and some varieties can be formed after a meteorite fall. Quartz can occur as beautiful crystals and cryptocrystalline aggregates, where no crystals can be observed, but colorful layers form intriguing patterns. Sometimes quartz forms such unusual forms that can be mistaken even with diamonds. Structural varieties are tridymite, cristobalite, coesite, and stishovite. Microcrystalline quartz varieties are jasper, carnelian, chalcedony, onyx, agate, chert, and flint. Quartz varieties are rock crystal, milk quartz, amethyst, citrine, ametrine, smoky quartz, morion, tiger’s eye, hawk’s eye, and aventurine. We will guide you through all the varieties of quartz known today. Quartz is accompanying humans for several thousand years and during this period it gathered numerous amount of names, which usually change from country to country. ![]() The chemical formula of quartz is quite simple SiO 2, but the range of colors, form of occurrences, and the presence of optical effects are multiple. Quartz is the mineral with the greatest amount of varieties. As an Amazon Associate, I earn from qualifying purchases with no additional costs for you.
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