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


Locality type:Deposit
Classification
Species:Muscovite var: Illite
Formula:K0.65Al2.0[Al0.65Si3.35O10](OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Illite 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:1943688
Long-form Identifier:1:3:1943688:1
GUID (UUID V4):0
Nearest other occurrences of Illite
60.1km (37.4 miles) ⓘGoldgrube mine, Görlitz, Görlitz District, Saxony, Germany
65.8km (40.9 miles) ⓘGronowskie Wzgórza quarry, Gronów, Gmina Zgorzelec, Zgorzelec County, Lower Silesian Voivodeship, Poland
78.7km (48.9 miles) ⓘKsięginki quarry, Lubań, Lubań County, Lower Silesian Voivodeship, Poland
82.5km (51.2 miles) ⓘJałowiec quarry, Jałowiec, Gmina Lubań, Lubań County, Lower Silesian Voivodeship, Poland
92.1km (57.2 miles) ⓘŻerkowice quarry, Żerkowice, Gmina Lwówek Śląski, Lwówek Śląski County, Lower Silesian Voivodeship, Poland
99.5km (61.8 miles) ⓘKonrad Cu-mine, Iwiny, Gmina Warta Bolesławiecka, Bolesławiec County, Lower Silesian Voivodeship, Poland
99.7km (61.9 miles) ⓘTin mine, Altenberg, 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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