Formula: (Mg,Ti,Fe,Al)2(BO3)O
Origin of name: locality Southwest of Edenville, in the town of Warwick, Orange Co., New York, U.S.A.
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 9.197, b = 9.358, c = 3.085
Colour: Dark brown to dull black
Diaphaneity: Subtranslucent, transparent in minute grains
Luster: Subvitreous, pearly, submetallic on cleavage
Habit: crystals slender prismatic, rounded terminations, embedded
Hardness: 3.5 to 4
Specific gravity: 3.35
Cleavage: 1; {100} perfect
Tenacity: Brittle
Streak: Bluish black to reddish black
Synonyms/varieties:
Comments:
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