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Goshenite

Gemstone
Goshenite is a colorless gem variety of beryl. It is called the mother of all gemstones because it can be transformed into other like emerald, morganite, or bixbite. Goshenite is also referred to as the purest form of beryl since there are... Wikipedia
Refractive index: 1.57 – 1.58
Hardness (Mohs hardness scale): 7.5 – 8
Color: White
Chemical formula: Be₃Al₂SiO₆
Category: beryl
Formula (repeating unit): Be; 3Al; 2(SiO; 3)6