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
The monolith quarry, Idd, Halden, Østfold, Norway


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 The monolith quarry, Idd, Halden, Østfold, Norway
Data Identifiers
Mindat Occurrence Record ID:1582243
Long-form Identifier:1:3:1582243:3
GUID (UUID V4):0
Nearest other occurrences of Biotite
4.8km (3.0 miles) ⓘHerrebøkasa, Aspedammen, Idd, Halden, Østfold, Norway
6.2km (3.9 miles) ⓘLundestad, Berg, Halden, Østfold, Norway
7.3km (4.5 miles) ⓘBakke Quarry, Idd, Halden, Østfold, Norway
8.4km (5.2 miles) ⓘFosby Feldspar Quarry, Berg, Halden, Østfold, Norway
8.6km (5.4 miles) ⓘVestgård, Berg, Halden, Østfold, Norway
16.2km (10.1 miles) ⓘHåkenbyfjellet, Halden, Østfold, Norway
22.9km (14.2 miles) ⓘStryker I Feldspar Quarry, Degernes, Rakkestad, Østfold, Norway
24.4km (15.1 miles) ⓘVestgård Feldspar Quarry, Skjeberg, Sarpsborg, Østfold, Norway
25.2km (15.6 miles) ⓘOrud quarry, Rakkestad, Østfold, Norway
28.9km (18.0 miles) ⓘRolfseide 2, Rakkestad, Østfold, Norway
References
Neumann, Henrich, Van der Wel, Didrik (1976) En undersøkelse av tungmetaller i granitter. Mineralogisk-Geologisk Museum - Universitetet i Oslo- Interne notater, Geologisk Museums venner. 62-63
 
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