Prasiolite
Variety SiO2
Also called Green amethyst
About it
Leek-green quartz. Almost all of it is amethyst from certain Brazilian deposits heated until it turns green; natural prasiolite is rare, and the trade name "green amethyst" is a misnomer.
- Type
- Variety
- Group
- Quartz variety
- Formula
- SiO2
- Hardness (Mohs)
- 7
- Specific gravity
- 2.65–2.66
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Trigonal
- Colours
- pale green, leek green
- Transparency
- transparent
- Cleavage and fracture
- none; conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.