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
Ertelien Mine, Ertelien Mines, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway


Locality type:Mine
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 Ertelien Mine, Ertelien Mines, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway
Data Identifiers
Mindat Occurrence Record ID:1834016
Long-form Identifier:1:3:1834016:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
4.2km (2.6 miles) ⓘSkjerpevika, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway
9.5km (5.9 miles) ⓘDypingdal serpentine-magnesite deposit, Snarum, Modum, Buskerud, Norway
9.9km (6.1 miles) ⓘSkaug Mine, Holleia, Ringerike Ni Mines, Ringerike, Buskerud, Norway
11.3km (7.0 miles) ⓘHilsen Farm, Snarum, Modum, Buskerud, Norway
13.2km (8.2 miles) ⓘDøvikkollen, Modum West, Modum, Buskerud, Norway
14.7km (9.1 miles) ⓘSkuterud Mines, Modum West, Modum, Buskerud, Norway
14.7km (9.2 miles) ⓘMellomgruvene, Skuterud Mines, Modum West, Modum, Buskerud, Norway
24.5km (15.2 miles) ⓘBjertnes pegmatite, Krødsherad, Buskerud, Norway
25.1km (15.6 miles) ⓘGrågalten Mine, Sigdal Nikkelværk, Sigdal, Buskerud, Norway
30.9km (19.2 miles) ⓘLangedalen Mine, Ringerike Ni Mines, Ringerike, Buskerud, Norway
References
Mansur, E.; Orvik, A. A.; Henderson, I.; Miranda, A. C.; Slagstad, T.; Dare, S.; Bjerkgaard, T.; Sandstad, J. S. (2025) Formation of the Ertelien and Langedalen magmatic Ni–Cu sulfide deposits in Norway: investigating the evolution of platinum-group-element-depleted systems at convergent margins. European Journal of Mineralogy, 37 (6). 841-869 doi:10.5194/ejm-37-841-2025
 
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