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.