Montroseite

montroseite

corvusite

uraninite

hewettite

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

Sedimentary 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(.

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