Monticellite
Mineral CaMgSiO4
About it
Pale grey to colourless calcium-magnesium olivine of baked dolomite and skarn; crystals come from Magnet Cove, Arkansas, Crestmore, California, and Oka, Quebec.
- Type
- Mineral
- Group
- Silicate (nesosilicate), olivine group
- Formula
- CaMgSiO4
- Hardness (Mohs)
- 5–5.5
- Specific gravity
- 3.03–3.27
- Streak
- white
- Lustre
- vitreous (glassy), resinous
- Crystal system
- Orthorhombic
- Colours
- colourless, white, pale greenish grey, yellowish grey
- Transparency
- transparent, translucent
- Cleavage and fracture
- poor; subconchoidal to uneven fracture
Typical values: real specimens vary. For more, see mindat.org.