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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Spinel from
Marsiliana slag locality, Valpiana - Castello della Marsiliana area slag sites, Massa Marittima, Grosseto Province, Tuscany, Italy


Locality type:Slag Locality
Classification
Species:Spinel
Formula:MgAl2O4
Formation:Post-mining/Anthropogenic
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Spinel data
Locality Data:Click here to view Marsiliana slag locality, Valpiana - Castello della Marsiliana area slag sites, Massa Marittima, Grosseto Province, Tuscany, Italy
Data Identifiers
Mindat Occurrence Record ID:954267
Long-form Identifier:1:3:954267:9
GUID (UUID V4):0
Nearest other occurrences of Spinel
28.5km (17.7 miles) ⓘMontecastelli Pisano, Castelnuovo di Val di Cecina, Pisa Province, Tuscany, Italy
43.4km (27.0 miles) ⓘTerranera Mine, Porto Azzurro, Livorno Province, Tuscany, Italy
54.1km (33.6 miles) ⓘIano (Jano), Montaione, Metropolitan City of Florence, Tuscany, Italy
62.5km (38.8 miles) ⓘSiena meteorite, Lucignano d'Asso, Montalcino, Siena Province, Tuscany, Italy
92.2km (57.3 miles) ⓘMontenero Quarry, Onano, Viterbo Province, Lazio, Italy
93.1km (57.9 miles) ⓘPoggio Pinzo (Gradoli pozzolana quarry), Gradoli, Viterbo Province, Lazio, Italy
References
Manasse, Andrea, Mellini, Marcello (2002) Chemical and textural characterisation of medieval slags from the Massa Marittima smelting sites (Tuscany, Italy). Journal of Cultural Heritage, 3 (3). 187-198 doi:10.1016/s1296-2074(02)01176-7
 
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