Common Opal
gem · common
Quick facts
- Formula
- SiO2·nH2O
- Hardness
- 5.5–6.5
- Luster
- resinous to waxy
- Colors
- orange, yellow, white, no play-of-color
Common opal (potch) has no play-of-color. Fire opal is the saturated yellow-orange-red bodycolor.
Resinous silica without spectral flash and without chalcedony banding.
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