Image: Andrew Silver (Public domain)
cubicuncommonOxides
Bixbyite
(Mn,Fe)2O3
This specimen displays sharp, black, cubic crystals of bixbyite, exhibiting a distinct metallic luster. The crystals are well-formed and appear to be embedded in a matrix or as individual euhedral crystals.
Bixbyite Physical Properties
Mohs Hardness
6Crystal System
cubicLuster
metallicStreak Color
blackCleavage
noneFracture
conchoidalSpecific Gravity
4.9Colors
blackTransparency
opaqueType Locality
Thomas Range, Juab County, Utah, USAMineral Group
OxidesUses
collectorAssociated Minerals
topaz, beryl, garnet, hematite, pseudobrookiteRarity
uncommonGeological Context
Bixbyite typically forms in rhyolitic volcanic rocks, often in vugs or cavities, as a result of high-temperature hydrothermal activity. It can also be found in manganese-rich metamorphic deposits.
