Formula: (Zn,Mn)Mn3O7.1-2H2O
Origin of name: for Samuel Woodruff, late-nineteenth-century miner for the New Jersey Zinc Company and mineral collector at Franklin, Nnew Jersey, U.S.A., who collected and preserved many of the finest specimens found at that locality.
Crystal system: Tetragonal
Crystal class: Unknown
Twinning:
Unit cell: a = 8.42, c = 9.28
Colour: iron-black to chocolate-brown, black-brown
Diaphaneity: Opaque
Luster: Dull
Habit: massive, botryoidal, pulverulent coatings
Hardness: about 4.5
Specific gravity: 3.71-4.01
Cleavage: None
Tenacity: Conchoidal fracture
Streak: Brown
Synonyms/varieties:
Comments:
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