Formula: Mo3O8 . nH2O
Origin of name: For J. Ilsemann, German mining official
Crystal system: Amorphous
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Blue, blue-black, black
Diaphaneity:
Luster:
Habit: Massive; earthy crusts; stains
Hardness:
Specific gravity:
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Readily soluble in water yielding a deep blue coloured solution
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