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Azurite Gemstone Information. Azurite is a rare variety of gemstone-quality copper ore. Azurite is one of two basic copper carbonate minerals (malachite is the other). Azurite is rarer than malachite and is considered more valuable. Azurite gets its name from the Persian word 'lazhward', which refers to its distinctive, vivid blue color.
Marcasite is the name given the mineral iron sulfide, which is mined all over the world. However, most of the gem called marcasite used in jewelry is actually iron pyrite, since genuine marcasite often crumbles into dust and is thus too delicate to be used in jewelry.arcasite is the name given the mineral iron sulfide, which is mined all over the world. However, most of the gem called marcasite used in jewelry is actually iron pyrite, since genuine marcasite often crumbles into dust and is thus too delicate to be used in jewelry.