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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
Grotta dello Zolfo (Grotta di Allume), Miseno, Bacoli, Metropolitan City of Naples, Campania, Italy


Classification
Species:Alunogen
Formula:Al2(SO4)3 · 17H2O
Comments:Very large crystal of alunogen

Habit:Incrostations
Colour:White
Luminescent properties:Blue
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Rare
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Misenite
Data
Mineral Data:Click here to view Alunogen data
Locality Data:Click here to view Grotta dello Zolfo (Grotta di Allume), Miseno, Bacoli, Metropolitan City of Naples, Campania, Italy
Data Identifiers
Mindat Occurrence Record ID:465477
Long-form Identifier:1:3:465477:3
GUID (UUID V4):0
Nearest other occurrences of Alunogen
6.2km (3.8 miles) ⓘSolfatara di Pozzuoli, Pozzuoli, Metropolitan City of Naples, Campania, Italy
6.2km (3.8 miles) ⓘ"Bocca Grande" fumarole, Solfatara di Pozzuoli, Pozzuoli, Metropolitan City of Naples, Campania, Italy
6.3km (3.9 miles) ⓘAntiniana (Scarfoglio), Pozzuoli, Metropolitan City of Naples, Campania, Italy
6.6km (4.1 miles) ⓘPisciarelli di Agnano, Pozzuoli, Metropolitan City of Naples, Campania, Italy
28.4km (17.7 miles) ⓘAtrio del Cavallo, Ercolano, Metropolitan City of Naples, Campania, Italy
References
Scacchi A. (1849): Memorie geologiche sulla Campania. Memoria 3a. Esame delle sostanze che si formano presso i fumaroli della Regione Flegrea. Rendiconto Accad. Sci. Napoli, 8, 317-335
Zambonini F. (1907): Su alcuni minerali della Grotta dello Zolfo a Miseno. Rendiconto Accad. Sci. fis. mat. di Napoli, serie 3, 46, 324-331
Zambonini, F. (1908) Su alcuni minerali della Grotta dello Zolfo a Miseno. Rivista di Mineralogia e Cristallografia Italiana, 36, 27-37
Palache, Charles; Berman, Harry; Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons.pages 396, 539
 
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