Opal
gem · common
Quick facts
- Formula
- SiO₂·nH₂O
- Hardness
- 5.5–6.5
- Luster
- Vitreous
- Colors
- Various
Opal is a hydrated amorphous form of silica, known for its unique play of color. It is found in various locations worldwide.
Look for vibrant play of color and lack of crystalline structure.
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