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
Buer, Bjørkedalen, Porsgrunn, Telemark, Norway


Locality type:Dump
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 Buer, Bjørkedalen, Porsgrunn, Telemark, Norway
Data Identifiers
Mindat Occurrence Record ID:673431
Long-form Identifier:1:3:673431:2
GUID (UUID V4):0
Nearest other occurrences of Biotite
4.6km (2.8 miles) ⓘBjørkedalsvegen road cut 1, Kjølsrød, Bjørkedalen, Porsgrunn, Telemark, Norway
6.0km (3.7 miles) ⓘE18 roadcuts, Slevolden, Porsgrunn, Telemark, Norway
6.2km (3.9 miles) ⓘIglestjern Quarry, Kjose, Larvik Commune, Vestfold, Norway
6.7km (4.2 miles) ⓘRønningen E 18 roadcuts, Porsgrunn, Telemark, Norway
6.8km (4.2 miles) ⓘFarrisite locality, Kjose, Larvik Commune, Vestfold, Norway
8.1km (5.0 miles) ⓘKokkersvold, Kokkersvold - Blåfjell E18 roadcuts, Langangen, Porsgrunn, Telemark, Norway
9.0km (5.6 miles) ⓘChiavennite dike, Blåfjell (E18 roadcuts), Kokkersvold - Blåfjell E18 roadcuts, Langangen, Porsgrunn, Telemark, Norway
10.4km (6.5 miles) ⓘAnundsjøen, Kvelde, Larvik Commune, Vestfold, Norway
11.9km (7.4 miles) ⓘLysebo roadcut, Lysebo, Hedrum, Larvik Commune, Vestfold, Norway
12.6km (7.8 miles) ⓘTråk (Tråg), Bamble, Telemark, Norway
References
Segalstad, Tom Victor, Larsen, Alf Olav (1978) Gadolinite-(Ce) from Skien, southwestern Oslo region, Norway. American Mineralogist, 63 (1-2) 188-195
 
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