Formula: (CaNa)Fe3Fe2(Si7Al)O22(OH)2
Origin of name: From iron (Latin ferrium) and barroisite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
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Diaphaneity:
Luster:
Habit:
Hardness: 5.5
Specific gravity: 3.50
Cleavage:
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Synonyms/varieties:
Comments: Series with ferribarroisite and with ferrobarroisite
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