General Information:
Chemical Formula:
Ca2Fe+++(Fe+++,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O)
Composition:
(Molecular Weight = 543.53 gm)
Calcium 14.75 % Ca
Aluminum 2.48 % Al
Iron 25.69 % Fe
Silicon 15.50 % Si
Hydrogen 0.37 % H
Oxygen 41.21 % O
Empirical Formula:
Ca2Fe3+2.5Al0.5(SiO4)(Si2O7)O2·(H2O)
Environment:
Fracture filling in hematite-magnetite ore from the Amerika stope at Langban.
IMA Status:
Not IMA Approved
Locality:
Langban, Varmland, Sweden.
Name Origin:
Named in 1971 by Moore for Julian Royce Goldsmith (1918-), American geochemist, University of Chicago.
Physical Properties:
Cleavage:
[100] Good
Color:
deep lustrous black or greenish olive.
Density:
3.6
Habits:
Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Sub Metallic
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