Axinite Locality: Schierke, Wernigerode, Harz Mts, Saxony-Anhalt, Germany Axinite crystals on a specimen from Schierke, a classic german locality. Field of view — Photo: Leon Hupperichs · CC BY-SA 3.0
Axinite-(Fe)
Also known as: Ferroaxinite, Axinite.
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.
Intro adapted from Wikipedia (CC BY-SA).
Axinite-(Fe) is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₄Fe²⁺₂Al₄[B₂Si₈O₃₀](OH)₂.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Axinite structural group.
Key properties: Mohs hardness 6.5–7; typically brown or purple or blue; white streak; vitreous luster.
IMA symbol Ax-Fe, IMA status: approved, named in 1801.
Collections: Collector Favorites, Gemstones.