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 well-formed, prismatic crystal of reddish-brown andalusite, likely embedded in a lighter-colored matrix.
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, white, violetTransparency
transparentType Locality
Lüsens valley (Lisens valley; Lüsens alp; Lisens alp), Sellrain valley, North Tyrol, Tyrol, AustriaMineral Group
SilicatesUses
refractory materials, gemstoneAssociated Minerals
quartz, muscovite, biotite, cordierite, kyanite, sillimaniteRarity
commonGeological Context
Andalusite is a common metamorphic mineral formed under specific conditions of regional metamorphism, typically low to moderate pressure and moderate to high temperature, serving as an important index mineral.
