General Information:
Chemical Formula:
Ca1.3V6O16·6(H2O)
Composition:
(Molecular Weight = 721.83 gm)
Calcium 7.22 % Ca
Vanadium 42.34 % V
Hydrogen 1.68 % H
Oxygen 48.76 % O
Empirical Formula:
Ca1.3V5+6O16·6(H2O)
Environment:
Sandstone-hosted uranium-vanadium deposits.
IMA Status:
Approved IMA 1962
Locality:
Eastside mines in San Juan County, New Mexico.
Name Origin:
Named after Edward P. Henderson of the U.S. National Museum, in recognition of his mineralogical studies of the vanadium-uranium deposits of the Colorado Plateau.
Physical Properties:
Color:
greenish black or black.
Density:
2.77 - 2.79, Average = 2.78
Habits:
Microscopic Crystals - Crystals visible only with microscopes., Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Fibrous - Crystals made up of fibers.
Hardness:
2.5 - Finger Nail
Luster:
Adamantine - Pearly
Streak:
brownish green
More details...