Formula: (Fe,Mg,Mn)3 B7O13Cl
Origin of name: From flower of heather (genus Erica) of similar colour
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: Light green to raspberry red, black
Diaphaneity:
Luster: Vitreous
Habit: Crystals pseudocubic, small
Hardness: 7 to 7.5
Specific gravity: 3.22
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with boracite; dimorphous with congolite
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