Cavansite
Mineral Ca(VO)Si4O10·4H2O
About it
Vivid blue balls of radiating prisms, often on white stilbite; nearly all specimens come from quarries near Pune, India, though it was first found in Oregon.
- Type
- Mineral
- Group
- Silicate (phyllosilicate), cavansite group
- Formula
- Ca(VO)Si4O10·4H2O
- Hardness (Mohs)
- 3–4
- Specific gravity
- 2.21–2.31
- Streak
- light blue
- Lustre
- vitreous (glassy), pearly
- Crystal system
- Orthorhombic
- Colours
- greenish blue, vivid blue
- Transparency
- transparent, translucent
- Cleavage and fracture
- good in one direction
Typical values: real specimens vary. For more, see mindat.org.