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Cogwheels of bournonite are up against colourful vesuvianite.
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Biotite from
Barclay Creek Skarn, Index Mining District, Snohomish County, Washington, USA


Locality type:Creek
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
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Barclay Creek Skarn, Index Mining District, Snohomish County, Washington, USA
Data Identifiers
Mindat Occurrence Record ID:236454
Long-form Identifier:1:3:236454:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
3.0km (1.8 miles) ⓘGunn Peak Prospect, Bitter Creek, Index Mining District, Snohomish County, Washington, USA
18.0km (11.2 miles) ⓘNorth Fork Copper Deposit, Buena Vista Mining District, King County, Washington, USA
20.7km (12.8 miles) ⓘSunday Lake Garnet Occurrence, Buena Vista Mining District, King County, Washington, USA
23.2km (14.4 miles) ⓘSunrise Prospect, North Fork of the Sultan River, Sultan Mining District, Snohomish County, Washington, USA
26.2km (16.3 miles) ⓘSultan Canyon, Sultan Mining District, Snohomish County, Washington, USA
26.2km (16.3 miles) ⓘRainy Mine, Middle Fork of the Snoqualmie River, Snoqualmie Mining District, King County, Washington, USA
35.0km (21.7 miles) ⓘCondor-Hemlock Mine, Middle Fork of the Snoqualmie River, Snoqualmie Mining District, King County, Washington, USA
44.7km (27.8 miles) ⓘCarmack Mine, Snoqualmie Mining District, King County, Washington, USA
45.1km (28.0 miles) ⓘMineral Creek Mine (Durrwachter Mine; Liberty Lode Mine), Mineral Creek, Kittitas County, Washington, USA
48.1km (29.9 miles) ⓘGold Mountain Prospect, Gold Mountain, Darrington Mining District, Snohomish County, Washington, USA
References
Valentine, Grant M., Huntting, Marshall T. (1956) Part I - Nonmetallic minerals, in Inventory of Washington Minerals. Bulletin 37, Washington Geological Survey.
 
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