Formula: Fe2-x(V,V)2O4(OH)4
Origin of name: for H. Schubnel, French mineralogist
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: black, thin fragments yellowish to greenish brown
Diaphaneity: transparent
Luster:
Habit: crystals minute, twinned
Hardness:
Specific gravity: 3.28
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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