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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Giorgiosite from
Aphroessa lava flow (Georgios lava flow), Nea Kameni Island, Santorini Caldera, Santorini Island, Thira, South Aegean, Greece


Locality type:Lava Flow
Classification
Species:Giorgiosite
Formula:Mg5(CO3)4(OH)2 · 5-6H2O
Confirmation
Validity:Valid - Type Locality
Data
Mineral Data:Click here to view Giorgiosite data
Locality Data:Click here to view Aphroessa lava flow (Georgios lava flow), Nea Kameni Island, Santorini Caldera, Santorini Island, Thira, South Aegean, Greece
Data Identifiers
Mindat Occurrence Record ID:5595
Long-form Identifier:1:3:5595:6
GUID (UUID V4):0
References
Lacroix, A. (1905). Sur un nouveau minéral, la giorgiosite. Bulletin de Minéralogie, 28(4), 198-200 https://www.persee.fr/doc/bulmi_0366-3248_1905_num_28_4_2756
Friedel, B. (1975): Synthetischer Giorgiosit. Neues Jahrbuch für Mineralogie, Monatshefte, 196–208 (in German with English abs.).
 
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