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...