Ferroceladonite

General Information:
 Chemical Formula:
K2Fe++Fe+++Si8O20(OH)4
 Composition:
(Molecular Weight = 802.59 gm)
Potassium 9.74 % K 
Iron 13.92 % Fe
Silicon 27.99 % Si
Hydrogen 0.50 % H 
Oxygen 47.84 % O 
 Empirical Formula:
K2Fe2+Fe3+(Si8O20)(OH)4
 Environment:
In an altered crystal-vitric tuff associated with ferroaluminoceladonite.
 IMA Status:
Approved IMA (Dana # Added)
 Locality:
Hokonui Hills, Southland, New Zealand.
 Name Origin:
Named from its composition (Fe++) and the French 'celadon,' sea-green, in allusion to its common color.
Physical Properties:
 Cleavage:
[001] Perfect
 Color:
dark bluish green.
 Density:
3.05
 Diaphaniety:
Translucent to opaque
 Habits:
Microscopic Crystals - Crystals visible only with microscopes., ,
 Hardness:
2-2.5 - Gypsum-Finger Nail
 Luster:
Earthy (Dull)
 Streak:
paler green
More details...