![]() Specific Gravity: 2.65 in most forms, but up to 2.91 in Chalcedonies Cryptocrystalline quartz is comprised of the entire Chalcedony group which includes Agates and Jaspers, Chrysoprase, Bloodstone, Carnelian, Onyx, Sardonyx, Sard, and even includes Flint and Chert.Īppearances and colors of quartz vary greatly, but their basic gemological properties remain consistent throughout the entire family, with few exceptions: Quartz SpecificationsĬhemical Composition: SiO2 (silicon dioxide)Ĭrystal System: Trigonal (hexagonal prisms) in many forms like crystalline masses, cryptocrystalline, granular, and in veins. Microcrystalline or Cryptocrystalline quartz has microscopically small crystals that are so minuscule and packed so tightly together that they’re completely indistinguishable to the naked eye. Microcrystalline Or Cryptocrystalline Quartz We will include them in the crystalline group.Ĭolored crystalline quartz varieties generally form as various water solutions are deposited in pegmatite dikes and veins over long periods of time, resulting in slow crystal growth that can yield massive specimens with perfect clarity, that facet beautifully. Other crystalline quartz varieties include Rock Crystal, Amethyst, Citrine, Ametrine, Prasiolite, Rose Quartz, Smokey Quartz, and Aventurine, as well as Hawk’s Eye, Tiger’s Eye andĭumortierite quartzisusually listed with the crystalline group although some sources list the latter three with the microcrystalline group. ![]() The photo above shows a piece of druzy with eye visible crystals. ![]() Macrocrystalline, or simply Crystalline, has crystals with distinct shapes recognizable to the naked eye, that run the gamut from tiny druzies all the way up to crystals larger than a man. Macro-crystalline quartz, includes stones like: Amethyst, Aventurine, rock crystal, blue quartz, Citrine, hawk’s eye, Prasiolite, quartz cat’s eye,smokey quartz, Rose Quartz and tiger’s eye. There are two main kinds of crystal quartz, Macrocrystalline and Cryptocrystalline. Quartz is available in a large variety of color and cuts at reasonable prices. Quartz is also one of the most loved gems in the world and for centuries has been used for jewelery and carvings. Quartz Crystal is one of the most common Minerals on Earth.
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