Formula: (Mn,Ca)Mn(Fe,Mn)2(Al,Fe)2(PO4)4(OH)2.8H2O
Origin of name: for Alfred Rittman, Italian volcanologist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: pale yellow
Diaphaneity: transparent
Luster: vitreous
Habit: tabular pseudohexagonal crystals 0.04 by 0.3 by 0.3 mm
Hardness: 3.5
Specific gravity: 2.81
Cleavage: 1; {001} indistinct
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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