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
Poggio Orlando mine, Lornano, Monteriggioni, Siena Province, Tuscany, Italy


Locality type:Mine
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 Poggio Orlando mine, Lornano, Monteriggioni, Siena Province, Tuscany, Italy
Data Identifiers
Mindat Occurrence Record ID:392115
Long-form Identifier:1:3:392115:9
GUID (UUID V4):0
Nearest other occurrences of Gypsum
0.1km (0.0 miles) ⓘLornano Mine, Lornano, Monteriggioni, Siena Province, Tuscany, Italy
7.5km (4.6 miles) ⓘIl Bagno (Aiola), Radda in Chianti, Siena Province, Tuscany, Italy
19.8km (12.3 miles) ⓘLe Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy
21.7km (13.5 miles) ⓘCamporedaldi Mine (La Minierina), Chiusdino, Siena Province, Tuscany, Italy
22.7km (14.1 miles) ⓘCastelnuovo Mine (Castelnuovo Pit; Castelnuovo deposit), Cavriglia, Arezzo Province, Tuscany, Italy
22.9km (14.2 miles) ⓘAllori Mine (Allori Pit; Allori deposit), Cavriglia, Arezzo Province, Tuscany, Italy
24.2km (15.0 miles) ⓘSan Donato Gaville Mine (San Donato Gaville pit; San Donato Gaville deposit), Figline e Incisa Valdarno, Metropolitan City of Florence, Tuscany, Italy
24.5km (15.2 miles) ⓘPodere Montisi quarry, Fontazzi, Murlo, Siena Province, Tuscany, Italy
26.4km (16.4 miles) ⓘSpicchiaiola, Volterra, Pisa Province, Tuscany, Italy
27.5km (17.1 miles) ⓘLa Ciulla, San Giovanni Valdarno, Arezzo Province, Tuscany, Italy
References
R. Meli, A. Rossellini (2001): La miniera solfifera di Lornano-Poggio Orlando (Siena). - Riv. Mineral. Ital., 25, 3: 140-149.
 
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