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Crystal system: Orthorhombic crystal system
and Montana are the chief sources of gemstones
and Jordan's ancient Petra
Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3)
Agate Crystal Heart Carving Topaz High QualityAgate is a rock consisting primarily of cryptocrystalline silica, chiefly chalcedony, alternating with microgranular quartz. Agate is a translucent variety of microcrystalline quartz. It is used as a semiprecious stone when it is of desirable quality and color. Agate generally forms by the deposition of silica from groundwater in the cavities of igneous rocks. These structures produce the banded patterns that are characteristic of many agates. Agate