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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Feldspar Group from
Spremberg-Graustein-Schleife deposit (Spremberg-Graustein Cu deposit), Spremberg, Spree-Neiße, Brandenburg, Germany


Locality type:Deposit
Classification
Species:'Feldspar Group' (not an IMA approved species)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Feldspar Group data
Locality Data:Click here to view Spremberg-Graustein-Schleife deposit (Spremberg-Graustein Cu deposit), Spremberg, Spree-Neiße, Brandenburg, Germany
Data Identifiers
Mindat Occurrence Record ID:1943679
Long-form Identifier:1:3:1943679:3
GUID (UUID V4):0
Nearest other occurrences of Feldspar Group
61.9km (38.5 miles) ⓘStolpen Castle cliff, Sächsische Schweiz-Osterzgebirge, Saxony, Germany
69.1km (42.9 miles) ⓘGravel pit, Vogelsang, Eisenhüttenstadt, Oder-Spree, Brandenburg, Germany
72.9km (45.3 miles) ⓘBuchberg trachybasalt quarry, Wittgendorf, Zittau, Görlitz District, Saxony, Germany
83.1km (51.6 miles) ⓘMonchiquite occurrence, Bogatynia, Zgorzelec County, Lower Silesian Voivodeship, Poland
83.7km (52.0 miles) ⓘTrachyandesite occurrence, Bogatynia, Zgorzelec County, Lower Silesian Voivodeship, Poland
91.6km (56.9 miles) ⓘJedlka, Malá Veleň, Děčín District, Ústí nad Labem Region, Czech Republic
95.6km (59.4 miles) ⓘWyrwak Hill, Kamień, Gmina Mirsk, Lwówek Śląski County, Lower Silesian Voivodeship, Poland
97.9km (60.8 miles) ⓘSadisdorf, Dippoldiswalde, Sächsische Schweiz-Osterzgebirge, Saxony, Germany
References
Nourizenouz, Zahra; Frenzel, Max; Guy, Bradley Martin; Beranoaguirre, Aratz; Gutzmer, Jens (2026) Insights into the mineralogy and distribution of Co, Ni, As and Bi in the sediment-hosted polymetallic ores of the Kupferschiefer in Lusatia, Germany. Journal of Geochemical Exploration, 287. doi:10.1016/j.gexplo.2026.108060
 
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