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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Stilpnomelane from
Arko Mine, Cuyuna North Range, Crow Wing County, Minnesota, USA


Locality type:Mine
Classification
Species:Stilpnomelane
Formula:K4Fe482+[Si64Al8]O164(OH)52 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Stilpnomelane data
Locality Data:Click here to view Arko Mine, Cuyuna North Range, Crow Wing County, Minnesota, USA
Data Identifiers
Mindat Occurrence Record ID:247802
Long-form Identifier:1:3:247802:9
GUID (UUID V4):0
Nearest other occurrences of Stilpnomelane
0.6km (0.4 miles) ⓘAlstead-North Hillcrest mine, Cuyuna North Range, Crow Wing County, Minnesota, USA
1.2km (0.7 miles) ⓘMahnomen No. 2 mine, Ironton, Cuyuna North Range, Crow Wing County, Minnesota, USA
2.5km (1.5 miles) ⓘMerritt No. 1 mine, Cuyuna North Range, Crow Wing County, Minnesota, USA
3.1km (1.9 miles) ⓘMerritt No. 2 Mine (Gorham Garbert Company), Cuyuna North Range, Crow Wing County, Minnesota, USA
3.4km (2.1 miles) ⓘPortsmouth Mine, Cuyuna North Range, Crow Wing County, Minnesota, USA
5.2km (3.2 miles) ⓘSagamore Mine (Syracuse property), Riverton, Cuyuna North Range, Crow Wing County, Minnesota, USA
18.0km (11.2 miles) ⓘCuyuna North Range, Crow Wing County, Minnesota, USA
83.7km (52.0 miles) ⓘAlsted Mine (Shawmut Company), Cuyuna North Range, Carlton County, Minnesota, USA
References
USGS Prof Paper 407
Blake, R. L. (1965) Iron phyllosilicates of the Cuyuna district in Minnesota. American Mineralogist, 50 (1-2) 148-169
 
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