General Information:
Chemical Formula:
Na0.3Fe+++2(Si,Al)4O10(OH)2·n(H2O)
Composition:
(Molecular Weight = 495.90 gm)
Sodium 1.39 % Na
Aluminum 5.44 % Al
Iron 22.52 % Fe
Silicon 16.99 % Si
Hydrogen 2.03 % H
Oxygen 51.62 % O
Empirical Formula:
Na0.3Fe3+2Si3AlO10(OH)2·4(H2O)
Locality:
Nontrone, Dordogne, France.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[001] Perfect
Color:
greenish yellow, brownish green, or olive green.
Density:
2.3
Diaphaniety:
Subopaque
Habits:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite)., ,
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
None.
Luster:
Earthy (Dull)
Streak:
white
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