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Quartz is a form of silica and is the most common mineral in the earths crust
Bulgarian Calcite and Quartz from madan ore field mine rhodope mts smolyani oblast
Green Opal is classified as a mineraloid rather than a true mineral because it lacks an ordered atomic lattice
Aragonite (cave calcite) from Mina potosi
chlorapatite Quartz is a form ofchlorapatite from phlogopite odegardenoverk, norway. Size 5. 8cm x 4. 5cm x 2. 6cm Weight 58g A chlorapatite crystal is a mineral belonging to the apatite group, with the chemical formula Ca5(PO4)3Clcap C a sub 5 open paren cap P cap O sub 4 close paren sub 3 cap C l 5(4)3 . These crystals typically form as hexagonal prisms, are found in a variety of environments like volcanic or sedimentary settings, and are characterized by the presence of chloride
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