General Information:
Chemical Formula:
Na4CaxV++++2xV+++++12-2xO32·8(H2O)
Composition:
(Molecular Weight = 1,379.40 gm)
Sodium 6.67 % Na
Calcium 1.45 % Ca
Vanadium 44.32 % V
Hydrogen 1.17 % H
Oxygen 46.40 % O
Empirical Formula:
Na4Ca0.5V4+V5+11O32·8(H2O)
Environment:
Sandstone-hosted uranium-vanadium deposits.
IMA Status:
Approved IMA 1961
Locality:
F-33 mine (T12N-R9W Sec 33) 10 km NE of Grants, Valencia County, New Mexico.
Name Origin:
Named after the town of Grants, New Mexico.
Physical Properties:
Color:
green black, dark green, or olive green.
Density:
2.94
Habits:
Crystalline - Fine - Occurs as well-formed fine sized crystals., Fibrous - Crystals made up of fibers., Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Hardness:
1-2 - Between Talc and Gypsum
Luster:
Silky
Streak:
brownish green
More details...