Formula: NaCa2(Fe,Mg)4Fe(Si6Al2)O22(OH)2
Origin of name: After locality, Hastings County, Ontario, Canada
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Dark green, black
Diaphaneity: Translucent to nearly opaque
Luster: Vitreous
Habit: Crystals short to long prismatic; massive, compact
Hardness: 5 to 6
Specific gravity: 3.17 to 3.59
Cleavage: 3; {110} perfect, {001} and {100} parting
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with magnesiohastingsite
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