General Information:
Chemical Formula:
Ca3(V,Al,Fe+++)2(SiO4)3
Composition:
(Molecular Weight = 484.97 gm)
Calcium 24.79 % Ca
Aluminum 3.34 % Al
Vanadium 12.60 % V
Iron 2.30 % Fe
Silicon 17.37 % Si
Oxygen 39.59 % O
Empirical Formula:
Ca3V3+1.2Al0.6Fe3+0.2(SiO4)3
Environment:
Vanadium rich clay found in a metamorphosed uranium-vanadium deposit.
IMA Status:
Approved IMA 1964
Locality:
Unnamed prospect pit in the Sandy or South Laguna Mine, Laguna uranium district, Valencia county, New Mexico.
Name Origin:
The name honors Macus I. Goldman, a sedimentary petrologist with the U. S. Geological Survey.
Physical Properties:
Cleavage:
None
Color:
dark green or brownish green.
Density:
3.74
Diaphaniety:
Transparent to Subopaque
Habits:
Crystalline - Fine - Occurs as well-formed fine sized crystals., ,
Hardness:
6-7 - Orthoclase-Quartz
Luster:
Vitreous (Glassy)
Streak:
white
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