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Dolomite

Dolomite is located as colourless, white, pink, or yellow crystals, often with distinctive curved faces. Rarely faceted, due to the softness and perfect cleavage, its main me is in massive form, like a decorative stone.
Present in limestones and marbles, the very best crystals are from Italy, Switzerland, Germany and the united states.
Properties
Chemical Composition: 
Magnesium and calcium carbonate
Crystal System / Forms: 
Trigonal
Hardness: 
3.5
Specific Gravity: 
2.85
Lustre: 
Vitreous to pearly.
Refractive Index / Birefringence: 
1.50 - 1.68 / 0.179
Cuts & Uses: 
Step cut, mixed cut.
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