Beryl is a single mineral with many varieties that are distinguished by their color. Few other minerals have so many known varieties specifically identified by their color. Many of the Beryl varieties are very important gemstones. In fact, all the transparent varieties of Beryl have been used as gemstones, although Emerald and Aquamarine are by far the most important and well-known varieties.

Chemical Formula Be3Al2SiO6

Color White, Colorless, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple

Hardness 7.5 – 8.0

Crystal System Hexagonal

Refractive Index 1.57 – 1.58

SG 2.6 – 2.8

Transparency Transparent to opaque

Double Refraction .006

Luster Vitreous

Cleavage 3,1 – basal

Mineral Class Beryl

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