Formula: (Mn,Ca)(Nb,Ti)5O12 . 9H2O
Origin of name: For V. Gerasimovskii, Russian mineralogist
Crystal system: Unknown
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Brown to light gray
Diaphaneity:
Luster: Pearly
Habit: Masses, platy
Hardness: 2
Specific gravity: 2.52 to 2.58
Cleavage: 1; One perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with manganbelyankinite
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