Prase is another green-colored form of chalcedony. It is prized because of its rarity. Prase has a more somber hue than chrysoprase.
Occurrence
Prase occurs in Poland and Czech Republic/Slovakia. However, since 1965, the best quality material comes from Queensland (Australia). Other localities are Austria, Brazil, Urals (Russia), and California (USA).
Prase Properties
- Specific Gravity: 2.61
- Refractive Index: 1.53-1.54
- Birefringence (DR): 0.004
- Luster: Vitreous to waxy
- Crystal Structure: Trigonal
- Composition: Silicon dioxide
- Hardness: 7
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