Cowlesite
Mineral CaAl2Si3O10·6H2O
Take care.
- Fragile: Handle it gently and pack it well; it breaks or crumbles easily.
About it
Very thin, soft blades in radiating sprays lining basalt cavities; first found near Goble, Oregon, and named for collector John Cowles.
- Type
- Mineral
- Group
- Silicate (tectosilicate), zeolite group
- Formula
- CaAl2Si3O10·6H2O
- Specific gravity
- 2.12–2.16
- Streak
- white
- Lustre
- pearly
- Crystal system
- Orthorhombic
- Colours
- colourless, white, grey, blue-grey
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.