Sphalerite and ankerite. Sphalerite is a zinc sulfide mineral with a chemical composition of (Zn, Fe)S. It is found in metamorphic, igneous, and sedimentary rocks in many parts of the world. Ankerite is a calcium, iron, magnesium, manganese carbonate mineral of the group of rhombohedral carbonates with formula: Ca(Fe, Mg, Mn)(CO3)2. Carnegie Natural History. Pittsburgh, PA | |
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