Vote for your favorite mineral in #MinCup26! - Hafnon vs. Putnisite
It's a pair of tiny minerals of unusual chemistry as orange Hafnon battles with purple Putnisite.
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Biotite from
Björkdal Mine, Sandfors, Skellefteå, Västerbotten County, Sweden


Locality type:Mine
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Tsumoite1
Quartz1
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Björkdal Mine, Sandfors, Skellefteå, Västerbotten County, Sweden
Data Identifiers
Mindat Occurrence Record ID:854173
Long-form Identifier:1:3:854173:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.1km (0.7 miles) ⓘHebbersfors (Häbbersfors), Sandfors, Skellefteå, Västerbotten County, Sweden
13.1km (8.2 miles) ⓘÅkerberg mine, Skellefteå, Västerbotten County, Sweden
13.9km (8.7 miles) ⓘBoliden Mine, Boliden, Skellefteå, Västerbotten County, Sweden
16.4km (10.2 miles) ⓘVaruträsk, Skellefteå, Västerbotten County, Sweden
17.2km (10.7 miles) ⓘYtterbodliden, Skellefteå, Västerbotten County, Sweden
17.8km (11.1 miles) ⓘÅkulla Au-Te deposit, Boliden, Skellefteå, Västerbotten County, Sweden
25.6km (15.9 miles) ⓘPetiknäs mine, Boliden, Skellefteå, Västerbotten County, Sweden
27.8km (17.2 miles) ⓘBergskär, Skellefteå, Västerbotten County, Sweden
34.8km (21.6 miles) ⓘÄlgliden dyke, Skellefteå, Västerbotten County, Sweden
72.6km (45.1 miles) ⓘKluntarna, Piteå, Norrbotten County, Sweden
References
Mäki, T. (1997). Volcanic hosted massive sulphide and gold deposits in the Skellefte district, Sweden and western Finland. Geological Survey of Finland.
Roberts, S.; Palmer, M. R.; Waller, L. (2006) Sm-Nd and REE Characteristics of Tourmaline and Scheelite from the Björkdal Gold Deposit, Northern Sweden: Evidence of an Intrusion-Related Gold Deposit? Economic Geology, 101 (7). 1415-1425 doi:10.2113/gsecongeo.101.7.1415
 
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