Celadonite
Mineral K(Mg,Fe)(Fe,Al)Si4O10(OH)2
Also called Green earth
About it
Soft, earthy blue-green to olive coatings and fillings in basalt cavities, often lining agates and zeolite pockets; the traditional "green earth" pigment.
- Type
- Mineral
- Group
- Silicate (phyllosilicate), mica group
- Formula
- K(Mg,Fe)(Fe,Al)Si4O10(OH)2
- Hardness (Mohs)
- 2
- Specific gravity
- 2.95–3.05
- Streak
- greenish
- Lustre
- dull, earthy
- Crystal system
- Monoclinic
- Colours
- blue-green, olive green, apple green
- Transparency
- opaque
- Cleavage and fracture
- perfect in one direction (microscopic)
Typical values: real specimens vary. For more, see mindat.org.