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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Gypsum from
Poggetti Butelli slag locality, Scarlino, Grosseto Province, Tuscany, Italy


Locality type:Slag Locality
Classification
Species:Gypsum
Formula:CaSO4 · 2H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Gypsum data
Locality Data:Click here to view Poggetti Butelli slag locality, Scarlino, Grosseto Province, Tuscany, Italy
Data Identifiers
Mindat Occurrence Record ID:1549999
Long-form Identifier:1:3:1549999:8
GUID (UUID V4):0
Nearest other occurrences of Gypsum
12.2km (7.6 miles) ⓘBottricoli slag locality, Valpiana - Castello della Marsiliana area slag sites, Massa Marittima, Grosseto Province, Tuscany, Italy
12.9km (8.0 miles) ⓘMontioni, Suvereto, Livorno Province, Tuscany, Italy
13.7km (8.5 miles) ⓘLago dell'Accesa slag locality, Massa Marittima, Grosseto Province, Tuscany, Italy
14.9km (9.2 miles) ⓘMarsiliana slag locality, Valpiana - Castello della Marsiliana area slag sites, Massa Marittima, Grosseto Province, Tuscany, Italy
14.9km (9.2 miles) ⓘAccesa mine, Massa Marittima, Grosseto Province, Tuscany, Italy
15.6km (9.7 miles) ⓘSerrabottini, Massa Marittima, Grosseto Province, Tuscany, Italy
16.5km (10.2 miles) ⓘFenice Capanne Mine, Massa Marittima, Grosseto Province, Tuscany, Italy
19.9km (12.4 miles) ⓘCastellaccia Mine, Montoccoli-Castellaccia area (Fosso Zanca-Filone di Montoccoli area; Zanca Valley mines), Massa Marittima, Grosseto Province, Tuscany, Italy
23.3km (14.4 miles) ⓘCretaio, Prata, Massa Marittima, Grosseto Province, Tuscany, Italy
23.6km (14.7 miles) ⓘMadonna di Fucinaia (Madonna della Fucinaia) slag heaps, Campiglia Marittima, Livorno Province, Tuscany, Italy
References
Costagliola, P., Benvenuti, M., Chiarantini,L., Bianchi, S., Di Benedetto, F., Paolieri, M., and Rossato, L. (2008) Impact of ancient metal smelting on arsenic pollution in the Pecora River Valley, Southern Tuscany, Italy. Applied Geochemistry, 23: 1241–1259.
 
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