Ferrierite
Mineral (Mg,Na,K)2Mg(Si,Al)18O36·9H2O
Also called Ferrierite-Mg, Ferrierite-Na, and Ferrierite-K
About it
Radiating sprays of thin blades, often orange-red, in volcanic rock; first described from Kamloops Lake, British Columbia, and named for Walter Ferrier of the Geological Survey of Canada.
- Type
- Mineral
- Group
- Silicate (tectosilicate), zeolite group
- Formula
- (Mg,Na,K)2Mg(Si,Al)18O36·9H2O
- Hardness (Mohs)
- 3–3.5
- Specific gravity
- 2.06–2.23
- Streak
- white
- Lustre
- vitreous (glassy), silky
- Crystal system
- Orthorhombic
- Colours
- colourless, white, pink, orange, red
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.