Formula: CaSr(Al,Mn,Fe)3Si3O11O(OH)
Origin of name: from strontium and piemontite
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: deep red
Diaphaneity: transparent
Luster: vitreous
Habit: prismatic crystals to 0.5 mm
Hardness: 6
Specific gravity: 3.65 to 3.73
Cleavage: 1; {001} perfect
Tenacity:
Streak: purple-brown
Synonyms/varieties:
Comments: Sr analogue of piemontite, member of the epidote group
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