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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Alunogen from
Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy


05940780017272037083760.jpg
Alunogen

Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy
04226350017272001855022.jpg
Alunogen, etc.

Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy
03992750017272001865558.jpg
Alunogen, etc.

Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy
05940780017272037083760.jpg
Alunogen

Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy
09990370017272037098374.jpg
Alunogen, etc.

Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy
00148330017362264645704.jpg
Alunogen, etc.

Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy
05940780017272037083760.jpg
Alunogen

Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy
04226350017272001855022.jpg
Alunogen, etc.

Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy
03992750017272001865558.jpg
Alunogen, etc.

Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy
Locality type:Mine
Classification
Species:Alunogen
Formula:Al2(SO4)3 · 17H2O
Comments:sharp freestanding micro crystals in 1 mm spherical aggregates.
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Metavoltine3
Halotrichite1
Pickeringite1
Data
Mineral Data:Click here to view Alunogen data
Locality Data:Click here to view Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy
Photo GalleryView Gallery (3 photos)
Data Identifiers
Mindat Occurrence Record ID:84177
Long-form Identifier:1:3:84177:1
GUID (UUID V4):0
Nearest other occurrences of Alunogen
75.4km (46.9 miles) ⓘVigneria stope, Rio Mine, Rio Marina, Rio, Livorno Province, Tuscany, Italy
82.6km (51.3 miles) ⓘVallone stope, Cape Calamita Mine, Capoliveri, Livorno Province, Tuscany, Italy
References
Sabelli, Cesare, Brizzi, Giancarlo (1984) Alteration Minerals of the Cetine Mine, Tuscany, Italy. The Mineralogical Record, 15 (1) 27-36
Menchetti, S., Batoni, M., Batacchi, C., Borselli, G., Brogi, A., Ceccantini, L., Fassina, B., Marchesini, M., Rossellini, A. & Ruggieri, G. (2015): Le Cetine di Cotorniano. Miniera e minerali. Associazione Micro-Mineralogica Italiana, Cremona, 354 p.
 
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