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What is Quartz?

One of the most common gem families and can be found all around the world. Quartz comprises several different groups of gems from crystalline quartz (crystals viewable by the naked eye) and crypto-crystalline (microscopic crystals). Crystalline quartz includes amethyst, aventurine, rock crystal, blue quartz, citrine, hawk’s eye, prasiolite, quartz cat's eye, smoky quartz, rose quartz, and tiger's eye. Crypto-crystalline quartz is also known as chalcedony and includes agate, bloodstone, carnelian, chyrsoprase, jasper, moss agate, onyx and sard.