Chemical Formula: Ca2Fe2+Al2BOSi4O15(OH)
Locality: Boug d’Oisans, France.
Name Origin: From the Greek acine – “ax” in allusion to the acute shape of typical crystals and the Latin – ferrum – “iron” in reference to the Fe in the chemical formula.
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.
Physical Properties
Cleavage: {100} Distinct, {001} Poor, {110} Poor
Color: Brown, Purplish blue, Gray, Greenish yellow.
Density: 3.27 – 3.29, Average = 3.28
Diaphaneity: Transparent to subtranslucent
Fracture: Brittle – Conchoidal – Very brittle fracture producing small, conchoidal fragments.
Hardness: 6.5-7 – Pyrite-Quartz
Luminescence: Non-fluorescent.
Luster: Vitreous (Glassy)
Streak: white
Photos :
 Locality: Boug d'Oisans, France. Name Origin: From the Greek acine - "ax" in allusion to the acute shape){kind=link}