Zoisite
Source: Tanzania
Chemical: Ca2Al3 (SiO4)3(OH)
Crystal System: Orthorhombic
Formation: Mostly
in granite intrusions
Properties: Zoisite is the mineral from which tanzanite is found. There is a green colored gemstone that is called green zoisite. The purple transparent variety is tanzanite.
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Ruby crystal
in green zoisite from Tanzania