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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Biotite from
Cupa dell'Olivella, Sant'Anastasia, Metropolitan City of Naples, Campania, Italy


01186410017371097408295.jpg
Biotite, etc.

Cupa dell'Olivella, Sant'Anastasia, Metropolitan City of Naples, Campania, Italy
01186410017371097408295.jpg
Biotite, etc.

Cupa dell'Olivella, Sant'Anastasia, Metropolitan City of Naples, Campania, Italy
09781640017272062304568.jpg
Biotite, etc.

Cupa dell'Olivella, Sant'Anastasia, Metropolitan City of Naples, Campania, Italy
Locality type:Valley
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
Associated Minerals Based on Photo Data:
Calcite2
Fayalite-Forsterite Series2
Hornblende Root Name Group2
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Cupa dell'Olivella, Sant'Anastasia, Metropolitan City of Naples, Campania, Italy
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:154875
Long-form Identifier:1:3:154875:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.7km (0.4 miles) ⓘLagno di Pollena, Pollena Trocchia, Metropolitan City of Naples, Campania, Italy
0.8km (0.5 miles) ⓘPollena quarries, Pollena Trocchia, Metropolitan City of Naples, Campania, Italy
2.4km (1.5 miles) ⓘSan Vito Quarry, San Vito, Ercolano, Metropolitan City of Naples, Campania, Italy
3.9km (2.4 miles) ⓘSan Vito, Ercolano, Metropolitan City of Naples, Campania, Italy
7.1km (4.4 miles) ⓘCamaldoli della Torre, Torre del Greco, Metropolitan City of Naples, Campania, Italy
10.3km (6.4 miles) ⓘVilla Inglese quarries, Torre del Greco, Metropolitan City of Naples, Campania, Italy
17.4km (10.8 miles) ⓘSoccavo, Naples, Metropolitan City of Naples, Campania, Italy
18.1km (11.2 miles) ⓘPianura, Naples, Metropolitan City of Naples, Campania, Italy
22.1km (13.7 miles) ⓘFiano tuff quarries, Nocera Inferiore, Salerno, Campania, Italy
23.5km (14.6 miles) ⓘSan Vito geothermal field, Pozzuoli, Metropolitan City of Naples, Campania, Italy
References
M. Carati - Guida alla mineralogia vesuviana - Calderini, Bologna, 1982
 
and/or  
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