Formula: Na(NaCa)(Fe,Mg)5Si8O22(OH)2
Origin of name: From ferrous iron (Fe2+) and richterite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Brown, green
Diaphaneity: Semitransparent
Luster: Vitreous
Habit: Crystals, prismatic
Hardness: 5 to 6
Specific gravity: 3.46 (synthetic)
Cleavage:
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Series with richterite
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