General Information:
Chemical Formula:Ca2Fe++(Fe+++,Al)2(SiO4)(Si2O7)(OH)2·(H2O)
Composition:(Molecular Weight = 545.54 gm)Calcium 14.69 %
CaAluminum 2.47 %
AlIron 25.59 %
FeSilicon 15.44 %
SiHydrogen 0.74 %
H Oxygen 41.06 %
O Empirical Formula: Ca2Fe2+Fe3+1.5Al0.5(SiO4)(Si2O7)(OH)2·(H2O)
IMA Status:Approved IMA 1968
Name Origin:Named in 1971 by Moore for Julian Royce Goldsmith (1918-), American geochemist, University of Chicago.
Physical Properties: Color:black, greenish black, or green.
Density:3.602
Diaphaniety:Translucent
Hardness:4.5 - Between Fluorite and Apatite
Luster:Sub Metallic
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General Information: Chemical Formula:Ca2Fe+++(Fe+++,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O)
Composition:(Molecular Weight = 543.53 gm)Calcium 14.75 %
CaAluminum 2.48 %
AlIron 25.69 %
FeSilicon 15.50 %
SiHydrogen 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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