Image: <a href="//commons.wikimedia.org/wiki/User:Archaeodontosaurus" title="User:Archaeodontosaurus">Didier Descouens</a> (CC BY 3.0)
triclinicuncommonBorosilicates
Axinite
Ca2FeAl2BSi4O15(OH)
A well-formed, brownish-violet Axinite crystal exhibiting characteristic wedge-shaped habit, approximately 6 cm in view, set against a dark background.
Axinite Physical Properties
Mohs Hardness
6.5Crystal System
triclinicLuster
vitreousStreak Color
whiteCleavage
Distinct to good in one direction ({100})Fracture
conchoidalSpecific Gravity
3.3Colors
brown, violet, yellow, gray, greenTransparency
transparent to translucentType Locality
St Christophe-en-Oisans, Isère, FranceMineral Group
BorosilicatesUses
collector's specimens, gemstone (rarely)Associated Minerals
quartz, epidote, prehnite, actinolite, calcite, tourmalineRarity
uncommonGeological Context
Axinite typically forms in contact metamorphic environments, often in metasomatized limestones or granitic intrusions, and can also be found in veins and cavities within granitic rocks.
