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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Columbite-(Mn) from
Alvarrões Mine, Gonçalo, Guarda, Guarda, Portugal


Locality type:Mine
Classification
Species:Columbite-(Mn)
Formula:Mn2+Nb2O6
Comments:in feldspar, fragile
Habit:tabular to 4mm, striated
Colour:metallic black
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Columbite-(Mn) data
Locality Data:Click here to view Alvarrões Mine, Gonçalo, Guarda, Guarda, Portugal
Data Identifiers
Mindat Occurrence Record ID:882542
Long-form Identifier:1:3:882542:1
GUID (UUID V4):0
Nearest other occurrences of Columbite-(Mn)
9.5km (5.9 miles) ⓘBendada Mines, Bendada, Sabugal, Guarda, Portugal
56.3km (35.0 miles) ⓘCastillejo de Dos Casas, Aldea del Obispo, Salamanca, Castile and Leon, Spain
56.6km (35.2 miles) ⓘLa Canalita Sn-rich pegmatitic dykes, Peñaparda, Salamanca, Castile and Leon, Spain
59.0km (36.6 miles) ⓘBarquilla Sn-Ge-Cd-Cu-Fe Deposit, Villar de la Yegua, Salamanca, Castile and Leon, Spain
74.2km (46.1 miles) ⓘSegura Mines (Segura mining field), União das Freguesias de Zebreira e Segura, Idanha-a-Nova, Castelo Branco, Portugal
76.3km (47.4 miles) ⓘFeli deposit, La Fregeneda, Salamanca, Castile and Leon, Spain
References
Fuchs, A.; Fuchs, R. (2014): Rosaroter Elbait aus der Serra de Estrela, Portugal. Lapis 39 (3), 12-20.
Ramos, F. (2007): Seixo Amarelo - Gonçalo rare element aplitic-pegmatitic field. In: Granitic pegmatites: the state of the art [locality No.5], Univ. Porto, Field trip guidebook mem. No.9, 72-86.
 
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