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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Biotite from
Bødtkeren Mine, Skien, Telemark, 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 Bødtkeren Mine, Skien, Telemark, Norway
Data Identifiers
Mindat Occurrence Record ID:1496313
Long-form Identifier:1:3:1496313:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
10.5km (6.5 miles) ⓘRomsdalen, Siljan, Telemark, Norway
12.9km (8.0 miles) ⓘPorphyritic syenite outcrops, Lake Mykle, Kongsberg, Buskerud, Norway
14.5km (9.0 miles) ⓘRauberen, Lake Mykle, Kongsberg, Buskerud, Norway
14.8km (9.2 miles) ⓘSteinsholtseter, Lardal, Larvik Commune, Vestfold, Norway
16.6km (10.3 miles) ⓘHydro Quarry, Nome, Telemark, Norway
16.7km (10.4 miles) ⓘVibeto Farm, Nome, Telemark, Norway
16.8km (10.5 miles) ⓘTufte Quarry, Søve Mines, Nome, Telemark, Norway
17.7km (11.0 miles) ⓘHolla, Nome, Telemark, Norway
19.8km (12.3 miles) ⓘBuer, Bjørkedalen, Porsgrunn, Telemark, Norway
22.9km (14.2 miles) ⓘBjørkedalsvegen road cut 1, Kjølsrød, Bjørkedalen, Porsgrunn, Telemark, Norway
References
Larsen, Alf Olav (1993) Gruver og skjerp i Skien [Mines and Prospects in Skien], Alf Olav Larsen. 1-72p.11
 
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