Images
Formula: (V3+,Fe2+,V4+)O(OH)
Hydroxide, diaspore group,
vanadium-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 4.0 measured, 4.11 calculated
Hardness: 5½ to 6½
Streak: Black
Colour: Black
Magnetism: Weakly magnetic
Common impurities: Al
Environments
Montroseite has been found associated with paramontroseite,
uraninite, corvusite,
hewettite, melanovanadite,
pascoite, hummerite,
pyrite, galena,
baryte and quartz
(HOM).
Localities
In the Shanglin and Hechi bitumens in Guangxi, China, montroseite occurs in
vanadiferous pyrobitumen
(HOM).
At the type locality, the Bitter Creek mine, Paradox Valley, Uravan Mining District, Montrose county, Colorado, USA,
montroseite is the chief vanadium ore mineral in the blackest ore
but is less abundant than corvusite in the greenish-black or blue-black
ore. It occurs in black, relatively unoxidised vanadium-uranium ore in
sandstone
(AM 38.1235-1241(.
At the Matchless Mine, Calamity Mesa, Uravan District, Mesa county, Colorado, USA, a small amount of montroseite
was found in a band of corvusite ore with thin seam fillings of
hewettite. The montroseite is in microscopic crystals interstitial
to the quartz grains of the ore-bearing
sandstone
(AM 38.1235-1241(.
At the Jo Dandy mine, Paradox Valley, Uravan Mining District, Montrose county, Colorado, USA, the ore is generally
oxidised and consists of minerals such as carnotite,
hewettite and hummerite. There
is a very small amount of montroseite in dark patches of corvusite
ore
(AM 38.1235-1241(.
At the Whitney mine, Uravan District, Montrose county, Colorado, USA, montroseite is the chief
vanadium ore mineral in the blackest ore but is less abundant than
corvusite in the greenish-black or blue-black ore. The montroseite
occurs in black, relatively unoxidised vanadium-uranium ore
(AM 38.1235-1241(.
At the North Mesa 5 mine, North Mesa Mine group, Temple Mountain, San Rafael Mining District, Emery county, Utah, USA,
montroseite is associated with bobjonesite in a silicified tree
(Min Rec 35-4.344).
At the Rex No. 2 mine, Temple Mountain, San Rafael Mining District, Emery county, Utah, USA, a small amount of
pitchblende is an indication of the relatively unoxidised environment of montroseite
(AM 38.1235-1241(.
At the Juniper Mine, Thompsons District, Grand county, Utah, USA, a small amount of pitchblende an indication
of the relatively unoxidised environment of montroseite. A specimen of mineralised fossil bone was found
to have microscopic tubelike fillings of montroseite in brown apatite
(AM 38.1235-1241(.
Back to Minerals