Image: <bdi><a href="https://www.wikidata.org/wiki/Q126871366" class="extiw" title="d:Q126871366"><span title="photographer from the United States">Nessa Eull</span></a></bdi> (CC0)
orthorhombicuncommonBorosilicates
Dumortierite
(Al,Fe)7(BO3)(SiO4)3(O,OH)3
This specimen is a roughly 7 cm, massive, purple-pink rock with a fine-grained to fibrous texture, showing some lighter white patches. The color is characteristic of dumortierite.
Dumortierite Physical Properties
Mohs Hardness
7Crystal System
orthorhombicLuster
vitreousStreak Color
whiteCleavage
good on {100}, poor on {110}Fracture
unevenSpecific Gravity
3.3Colors
purple, blue, pink-red, brownTransparency
translucentType Locality
Oreana, NevadaMineral Group
BorosilicatesUses
jewelry, ornamental, collectorAssociated Minerals
quartz, muscovite, andalusite, kyaniteRarity
uncommonGeological Context
Dumortierite is typically found in aluminum-rich metamorphic rocks, granitic rocks, and some ore deposits, often formed under high-temperature conditions.
