Formula: (Mn,Ca)6(V,As)Si5O18(OH)
Origin of name: For Fancesco Meda, Amateur Italian mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Brownish red, brown
Diaphaneity:
Luster: Subadamantine
Habit: Grains to 1.5 mm
Hardness:
Specific gravity: 3.70
Cleavage: 1; {100} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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