Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Montroseite from
Hubbard Homestead Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA


Locality type:Mine
Classification
Species:Montroseite
Formula:(V3+,Fe3+)O(OH)
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified, Dealer/Collection Label
Data
Mineral Data:Click here to view Montroseite data
Locality Data:Click here to view Hubbard Homestead Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:1563372
Long-form Identifier:1:3:1563372:3
GUID (UUID V4):0
Nearest other occurrences of Montroseite
2.8km (1.7 miles) ⓘLumsden No. 6 and No. 2, Mesa County, Colorado, USA
3.4km (2.1 miles) ⓘLost Dutchman Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA
6.0km (3.7 miles) ⓘRae Marie Nos. 4-6, Beaver Mesa, Gateway Mining District, Grand County, Utah, USA
6.1km (3.8 miles) ⓘCanyon No. 1, Beaver Mesa, Gateway Mining District, Grand County, Utah, USA
6.3km (3.9 miles) ⓘRae Marie 3, Beaver Mesa, Gateway Mining District, Grand County, Utah, USA
6.3km (3.9 miles) ⓘBonanza 1 and 2 (Bonanza - Corvusite), Beaver Mesa, Gateway Mining District, Grand County, Utah, USA
8.8km (5.5 miles) ⓘAxis (P.F.G.E.), Polar Mesa, Gateway Mining District, Grand County, Utah, USA
9.2km (5.7 miles) ⓘYellow Jacket Mine, Polar Mesa, Gateway Mining District, Grand County, Utah, USA
9.9km (6.2 miles) ⓘJumbo, Polar Mesa, Gateway Mining District, Grand County, Utah, USA
10.1km (6.3 miles) ⓘPittsburg, Polar Mesa, Gateway Mining District, Grand County, Utah, USA
References
In the collection of Alex Earl
Kampf, Anthony R; Plasil, Jakub; Olds, Travis A; Emproto, Christopher; Ma, Chi; Sejkora, Jiri; Adams, Paul M; Marty, Joe (2025) Hubbardite, a new magnesium uranyl-sulfate mineral closely related to zippeite. Journal of Geosciences, 70 (3). 151-161
 
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