Beryl Family Gemstones
Beryl is an aluminum beryllium silicate mineral. It is found in metamorphic and hydrothermal regions and produces several gemstones. It forms crystals in the hexagonal system with a hardness of 7 1/2 to 8 on the Moh's Scale. It has a density of 2.67 to 2.78 grams / cubic centimeter. Streak is white. The mineral has four colors that produce gemstone......
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