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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Opal from
Profitis Ilias Au deposit, Milos Island, Milos, South Aegean, Greece


Locality type:Deposit
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Profitis Ilias Au deposit, Milos Island, Milos, South Aegean, Greece
Data Identifiers
Mindat Occurrence Record ID:630792
Long-form Identifier:1:3:630792:9
GUID (UUID V4):0
Nearest other occurrences of Opal
6.2km (3.9 miles) ⓘChondro Vouno, Milos Island, Milos, South Aegean, Greece
10.4km (6.5 miles) ⓘPaliochori beach (Paleochori bay), Milos Island, Milos, South Aegean, Greece
23.9km (14.9 miles) ⓘPrassa Quarry (Bentomine S.A. Quarry), Kimolos Island, Kimolos, Milos, South Aegean, Greece
93.1km (57.8 miles) ⓘIron ore occurrence, Palea Kameni Island, Santorini Caldera, Santorini Island, Thira, South Aegean, Greece
References
Kilias, Stephanos P., Naden, Jon, Cheliotis, Ioannis, Shepherd, Thomas J., Constandinidou, Heleni, Crossing, John, Simos, Ioannis (2001) Epithermal gold mineralisation in the active Aegean Volcanic Arc: the Profitis Ilias deposit, Milos Island, Greece. Mineralium Deposita, 36 (1) 32-44 doi:10.1007/s001260050284
 
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