Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
orthorhombiccommonSilicates
Andalusite
Al2SiO5
The image displays a reddish-brown, prismatic crystal of Andalusite, exhibiting a somewhat blocky habit and a vitreous luster.
Andalusite Physical Properties
Mohs Hardness
7Crystal System
orthorhombicLuster
vitreousStreak Color
whiteCleavage
Good on {110}Fracture
unevenSpecific Gravity
3.15Colors
pink, red, brown, yellow, green, gray, whiteTransparency
transparentType Locality
Lüsens valley (Lisens valley; Lüsens alp; Lisens alp), Sellrain valley, North Tyrol, Tyrol, AustriaMineral Group
SilicatesUses
refractory materials, gemstone, indicator mineralAssociated Minerals
kyanite, sillimanite, quartz, muscovite, garnet, cordieriteRarity
commonGeological Context
Andalusite is a common metamorphic mineral that forms in pelitic rocks under conditions of relatively low pressure and moderate to high temperature. It is an important index mineral for metamorphic grade.
