Formula: KMgV5O14 . 8H2O
Origin of name: After locality; Hummer mine, Montrose Co., Colorado
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: Yellow to orange
Diaphaneity: Translucent
Luster:
Habit: Crystals elongated parallel to c-axis or tabular; crusts; thin veinlets
Hardness:
Specific gravity: 2.53
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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