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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Biotite from
Szklarska Poręba Huta granite quarry, Szklarska Poręba, Karkonosze County, Lower Silesian Voivodeship, Poland


Locality type:Quarry
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 Szklarska Poręba Huta granite quarry, Szklarska Poręba, Karkonosze County, Lower Silesian Voivodeship, Poland
Data Identifiers
Mindat Occurrence Record ID:439387
Long-form Identifier:1:3:439387:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.0km (0.6 miles) ⓘSkalna Brama pegmatite, Szklarska Poręba, Karkonosze County, Lower Silesian Voivodeship, Poland
2.7km (1.7 miles) ⓘPtasie Gniazda Rocks, Szklarska Poręba, Karkonosze County, Lower Silesian Voivodeship, Poland
3.8km (2.4 miles) ⓘZwalisko, Szklarska Poręba, Karkonosze County, Lower Silesian Voivodeship, Poland
4.2km (2.6 miles) ⓘKarkonosze IG-1 borehole, Jakuszyce, Szklarska Poręba, Karkonosze County, Lower Silesian Voivodeship, Poland
4.8km (3.0 miles) ⓘStanisław Quarry, Kopaniec, Gmina Stara Kamienica, Karkonosze County, Lower Silesian Voivodeship, Poland
5.7km (3.6 miles) ⓘMichałowice granite quarry, Piechowice, Karkonosze County, Lower Silesian Voivodeship, Poland
11.2km (7.0 miles) ⓘJizerská louka, Jizerka, Kořenov, Jablonec nad Nisou District, Liberec Region, Czech Republic
12.7km (7.9 miles) ⓘOld leucogranite quarry, Kotlina, Gmina Mirsk, Lwówek Śląski County, Lower Silesian Voivodeship, Poland
13.3km (8.3 miles) ⓘSn mine, Gierczyn, Gmina Mirsk, Lwówek Śląski County, Lower Silesian Voivodeship, Poland
14.3km (8.9 miles) ⓘCieplice granite quarry, Cieplice Śląskie-Zdrój, Jelenia Góra, Lower Silesian Voivodeship, Poland
References
Eligiusz Szełęg private collection
Kozłowski, A., Matyszczak, W. (2018) Oxygenic bismuth minerals in the NE part of the Karkonosze pluton (West Sudetes, SW Poland). Acta Geologica Polonica, 68(4), 537-554.
 
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