Wollastonite
Mineral CaSiO3
About it
White bladed or fibrous masses in metamorphosed limestone that split into long splinters; Willsboro, New York, is a major source, and it is mined for ceramics.
- Type
- Mineral
- Group
- Silicate (inosilicate), wollastonite group
- Formula
- CaSiO3
- Hardness (Mohs)
- 4.5–5
- Specific gravity
- 2.86–3.09
- Streak
- white
- Lustre
- vitreous (glassy), pearly, silky
- Crystal system
- Triclinic
- Colours
- white, grey, colourless, pale green
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction, good in two others
Typical values: real specimens vary. For more, see mindat.org.