General Information:
Chemical Formula:
(Fe+++,Sb+++++,W++++++)O4·(H2O)
Composition:
(Molecular Weight = 262.07 gm)
Iron 19.18 % Fe
Antimony 41.81 % Sb
Hydrogen 0.77 % H
Tungsten 7.72 % W
Oxygen 30.52 % O
Empirical Formula:
Fe3+0.9Sb0.9W0.11O4·(H2O)
Environment:
Occurs adjacent to hematite-cassiterite veins in rhyolite and with cassiterite at Esperansa tin mine, near Durango, Mexico.
IMA Status:
Approved IMA
Locality:
Type locality is Squaw Creek, Catron County, New Mexico.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[100] Imperfect
Color:
yellowish brown.
Diaphaniety:
Transparent
Hardness:
6-6.5 - Orthoclase-Pyrite
Luster:
Adamantine
Streak:
yellowish brown
More details...