Formula: Ca2Mn3(SiO4)(Si2O7)(OH)3
Origin of name: For Russell MacFall, American amateur mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Reddish-brown to maroon, brown to dull pink
Diaphaneity:
Luster: Silky to subadamantine
Habit: Coarse aggregates; massive, compact
Hardness: ~ 5
Specific gravity: 3.43
Cleavage: 1; {001} perfect
Tenacity:
Streak: Brown with reddish tint
Synonyms/varieties:
Comments: Hardness approximate
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