Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Dumortierite from
Ornavasso pegmatite, Ornavasso, Verbano-Cusio-Ossola Province, Piedmont, Italy


Locality type:Pegmatite
Classification
Species:Dumortierite
Formula:Al(Al2O)(Al2O)2(SiO4)3(BO3)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Dumortierite data
Locality Data:Click here to view Ornavasso pegmatite, Ornavasso, Verbano-Cusio-Ossola Province, Piedmont, Italy
Data Identifiers
Mindat Occurrence Record ID:347394
Long-form Identifier:1:3:347394:8
GUID (UUID V4):0
Nearest other occurrences of Dumortierite
3.9km (2.4 miles) ⓘNibbio-Val Faera (Nibbio-Val Fredda) pegmatites, Nibbio, Mergozzo, Verbano-Cusio-Ossola Province, Piedmont, Italy
4.2km (2.6 miles) ⓘCuzzago-Proman pegmatite veins, Premosello-Chiovenda, Verbano-Cusio-Ossola Province, Piedmont, Italy
7.3km (4.5 miles) ⓘColloro-(Premosello) pegmatite veins, Premosello-Chiovenda, Verbano-Cusio-Ossola Province, Piedmont, Italy
27.7km (17.2 miles) ⓘPonte Valley, Brissago, Locarno, Ticino, Switzerland
27.8km (17.3 miles) ⓘIsolella, Borgosesia, Vercelli Province, Piedmont, Italy
30.3km (18.8 miles) ⓘCrodolo Valley, Brissago, Locarno, Ticino, Switzerland
57.2km (35.5 miles) ⓘCastione, Arbedo-Castione, Bellinzona, Ticino, Switzerland
87.5km (54.4 miles) ⓘSchiesone Creek, Rifugio Il Biondo, Schiesone Valley, Prata Camportaccio, Sondrio Province, Lombardy, Italy
References
Mattioli V. (1983): I minerali dei differenziati acidi e basici dell'Ossola inferiore (NO). Riv. Mineral. Ital., 7, 1 (1/2003), 23-26.
Orlandi, P. & Campostrini, I. (2005): Zibaldone. Aggiornamenti di mineralogia italiana 2004. Rivista Mineralogica Italiana, 3/2005, 184-191.
 
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