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Pyrite is an iron sulphide mineral with a cubic crystal system and is dimorphous with marcasite.
It occurs as cubic crystals with stri
Brazilianite is a soft and brittle mineral that in general does work very well as a gemstone. It's soft at 5.5 Mohs, and so it will qui
Albite is a member of the feldspar species as is predominantly a white or whitish mineral. A fine Albite gem will be colorless (mostly)
Peridot is the greener type of gem-quality specimen of Forsterite-Olivine, which is an important, rock-forming mineral, a silicate of m