Plasma chalcedony is the opaque, green, spotted variety that is used in decorative carvings and cameos. It may show yellowish spots in addition to its base color. The plasma chalcedony rough is very deep green.
Occurrence
Plasma chalcedony is mined in Zimbabwe.
Plasma Chalcedony Properties
- Specific Gravity: 2.61
- Refractive Index: 1.53-1.54
- Birefringence (DR): 0.004
- Luster: Vitreous
- Crystal Structure: Trigonal
- Composition: Silicon dioxide
- Hardness: 7
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