7 Photos
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

Gallery