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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Tridymite from
Mount Vesuvius, Metropolitan City of Naples, Campania, Italy


09129560017367083869339.jpg
Tridymite, etc.

Mount Vesuvius, Metropolitan City of Naples, Campania, Italy
09129560017367083869339.jpg
Tridymite, etc.

Mount Vesuvius, Metropolitan City of Naples, Campania, Italy
05570300017271927203988.jpg
Tridymite, etc.

Mount Vesuvius, Metropolitan City of Naples, Campania, Italy
Locality type:Stratovolcano
Classification
Species:Tridymite
Formula:SiO2
Comments:found in an ejectum of the 1822-eruption
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Clinopyroxene Subgroup1
Pseudobrookite1
Litidionite1
Data
Mineral Data:Click here to view Tridymite data
Locality Data:Click here to view Mount Vesuvius, Metropolitan City of Naples, Campania, Italy
Data Identifiers
Mindat Occurrence Record ID:475220
Long-form Identifier:1:3:475220:2
GUID (UUID V4):0
References
[vom Rath, G., (1872): Tridymit in Auswürflingen des Vesuves, Annalen der Physik und Chemie, Vol. 233, 280-281] [Rath, G. vom, 1877: Über einige durch vulkanische Dämpfe gebildete Mineralien des Vesuvs, Verhandlungen des Naturhistorischen Vereins der Rheinlande, 144-167]
Balassone, Giuseppina, Petti, Carmela, Mondillo, Nicola, Panikorovskii, Taras L., de Gennaro, Roberto, Cappelletti, Piergiulio, Altomare, Angela, Corriero, Nicola, Cangiano, Maria, D’Orazio, Loredana (2019) Copper Minerals at Vesuvius Volcano (Southern Italy): A Mineralogical Review. Minerals, 9 (12) 730 doi:10.3390/min9120730
 
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