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Mineralpedia Details for Axinite-(Fe)

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Axinite-(Fe)

Axinite-(Fe)

Previously called Ferroaxinite, this mineral is named for the dominance of ferroan iron (Fe2+) in the chemical formula and as a member of the Axinite Group, which in turn received its name from the Greek word for “axe” in reference to the sharp crystal habit. Axinite-Fe is an uncommon mineral, with localities for fine crystals in England, France, Switzerland, Russia, Japan, the United States, Canada, Mexico, and Brazil. It occurs in various grades of regionally metamorphosed rock, contact metamorphic rock, and pegmatites.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/ferroaxinite.pdf

Formula
Ca4Fe2+2Al4[B2Si8O30](OH)2 
Crystal System
Triclinic 
Crystal Habit
Massive - Granular, Lamellar 
Cleavage
Distinct, Poor, Poor 
Luster
Vitreous (Glassy) 
Color
brown, purplish blue, gray, greenish yellow 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle - Conchoidal 
Hardness
6.5-7 
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Axinite-(Fe) from Monte Bianco, Italy

Axinite-(Fe)
            from Monte Bianco, Italy

Well-formed and very nice, lustrous Axinite crystals to 6mm

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Axinite-(Fe) from Colebrook Hill mine, Rosebery dist., Tasmania, Australia

Axinite-(Fe)
            from Colebrook Hill mine, Rosebery dist., Tasmania, Australia

Cute little combo specimen with several purplish brown, bladed crystals of Axinite to 5mm associated with Arsenopyrite crystals.

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