Prase is a dull green to yellowish green variety of chalcedony, a cryptocrystalline quartz. It is commonly fashioned en cabochon to show off its leek-green color. Prase can be confused with chrysoprase since they are very similar in appearance, but a darker, less saturated color is typically indicative of prase.
- Optical Properties
- Characteristic Physical Properties
- Chemistry & Crystallography
Transparent - Semitranslucent
Prase's green color is due to chlorite inclusions, the grayish green color is due actinolite fibers and the blue color is due to crocidolite fibers.
silicon dioxide (aka silica)
Countries of Origin
Ecuador; Russian Federation; United States of America; United Kingdom of Great Britain and Northern Ireland; Spain; Greece; Austria; Morocco; Unknown; China; Ireland; Brazil; Italy; Australia; Bulgaria; France; Germany; Nepal