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Quarts, opals & agate

Quartz is a mineral with the chemical formula SiO2 (silica), abundant in the lithosphere, where it forms one of the most important minerals. Quartz forms a variety of varieties, including, clear crystal, pink roses, brown or smoky quartz, cryptocrystalline chalcedony, striped agate, onyx, purple amethyst, tiger's eye, iron quartz, jasper crystallizing in a triangular system, yellow citrine, black morion or green pig or flint, opals and others. Quartz is a common component of granite, sandstone and many other rocks. More info

Quartz is a mineral with the chemical formula SiO2 (silica), abundant in the lithosphere, where it forms one of the most important minerals. Quartz forms a variety of varieties, including, clear crystal, pink roses, brown or smoky quartz, cryptocrystalline chalcedony, striped agate, onyx, purple amethyst, tiger's eye, iron quartz, jasper crystallizing in a triangular system, yellow citrine, black morion or green pig or flint, opals and others. Quartz is a common component of granite, sandstone and many other rocks.
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