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Dominant species
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Manganaxinite
Manganaxinite
Chemical
Formula
(Ca,Fe,Mn)3Al2BO3Si4O12OH or Ca2(Fe,Mn)Al2BSi4O15(OH)
Species
Silicates
Crystal
System
Triclinic
Mohs
Scale
6-7.5
Specific
Gravity
3.18-3.37
Color
Reddish brown to yellow to colorless. Blue, Purple, grey.
Streak
White
Luster
Vitreous
Refractive
Index
nα = 1.672–1.693nβ = 1.677–1.701nγ = 1.681–1.704
Cleavage
Good on
Fracture
Conchoidal
Crystal Habit:Tabular, wedge shaped crystals
Axinite is a brown to violet-brown, or reddish-brown bladed group of minerals composed of calcium aluminium boro-silicate, (Ca,Fe,Mn)3Al2BO3Si4O12OH. Axinite is pyroelectric and piezoelectric.

The axinite group includes:

  • Axinite-(Fe), ferro-axinite, iron rich, lilac brown to black
  • Axinite-(Mg), magnesio-axinite, magnesium rich, pale blue to gray
  • Axinite-(Mn), manganaxinite, manganese rich, yellow-orange
  • Tinzenite, iron – manganese intermediate, yellow

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