Hendersonite

Formula:  Ca₃(V,V)₁₂O₃₂ ^. 12H₂O

Origin of name:  For Edward Henderson, American meteoriticist

Crystal system:  Orthorhombic

Crystal class:  mm2 or 2/m 2/m 2/m

Twinning: 

Unit cell: 

Colour:  Dark greenish black to black; turns brownish on exposure

Diaphaneity: 

Luster:  Pearly to subadamantine

Habit:  Crystals, elongated, six-sided platy; aggregates of microscopic fibers or blades

Hardness:  ~ 2.5

Specific gravity:  2.77 to 2.79

Cleavage:  None

Tenacity: 

Streak:  Brownish green

Synonyms/varieties:

Comments: