Formula: Fe2Si4O10(OH)2
Origin of name: From ferric iron (Fe3+) and pyrophyllite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Brown-yellow
Diaphaneity: Semitransparent
Luster:
Habit: Scaly, granular, compact
Hardness: 1.5 to 2
Specific gravity: 2.97 to 3.01
Cleavage: 1; perfect, probably {001}
Tenacity:
Streak:
Synonyms/varieties:
Comments: Ferric iron (Fe3+) analogue of pyrophyllite
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