Williamsite is a variety of serpentine. It is translucent, oil green, veined, or spotted with inclusions. Williamsite is very rare and is used in jewelry.
Occurrence
Williamsite occurs in China, England, and Italy.
Williamsite Properties
- Specific Gravity: 2.60
- Refractive Index: 1.55-1.56
- Birefringence (DR): 0.001
- Luster: Vitreous to greasy
- Crystal Structure: Monoclinic
- Composition: Magnesium hydroxy silicate
- Hardness: 5
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