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)
orthorhombicuncommonOxides
Brookite
TiO2
The image displays dark, reddish-brown to black, tabular brookite crystals, some exhibiting striations, nestled among or on clear to milky quartz crystals.
Brookite Physical Properties
Mohs Hardness
5.5Crystal System
orthorhombicLuster
vitreousStreak Color
yellowish-brown to colorlessCleavage
poor on {120} and {001}Fracture
subconchoidal to unevenSpecific Gravity
4.08Colors
brown, reddish-brown, yellowish-brown, blackTransparency
translucent to opaqueType Locality
Magnet Cove, Hot Spring County, Arkansas, USAMineral Group
OxidesUses
collector, minor source of titaniumAssociated Minerals
quartzRarity
uncommonGeological Context
Brookite is a titanium dioxide mineral that forms under specific conditions, often found in hydrothermal veins, alpine clefts, and metamorphic rocks. It is a polymorph of rutile and anatase, forming at lower temperatures and pressures than rutile.
