A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical pr — Photo: James St. John · CC BY-SA 4.0
Chrysoprase
The apple-green variety of chalcedony, colored by nickel — the most valuable of the chalcedony gemstones.
Intro adapted from Wikipedia (CC BY-SA).
Chrysoprase is a mineral variety of Quartz, with the chemical formula SiO₂.
It crystallizes in the trigonal crystal system.
Key properties: Mohs hardness 7; typically green.
Collections: Gemstones, Collector Favorites.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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