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Alfonso Cossa
(Mg0.5,◻)Al6(SO4)6(HSO4)F6 · 36H2O
The earlier proposed formula NaAl6(SO4)6(SO3F)F6.36H2O is false (see Demartin et al., 2011).
Named by Francesco Demartin, Carlo Maria Gramaccioli, Italo Campostrini, and C. Castellano in 2011 in honor of Alfonso Cossa (3 November 1833, Milan, Italy - 23 October 1902, Turin, Italy), for his work on the minerals and rocks of Vulcano.
This page provides mineralogical data about Cossaite.

Classification of Cossaite

Approval Year:

Type Occurrence of Cossaite

General Appearance of Type Material:
Stout prismatic crystals up to 0.1 mm in size, which are terminated by rhombohedral faces.
Place of Conservation of Type Material:
Reference Collection of the Dipartimento di Chimica Strutturale e Stereochimica Inorganica at the Universita degli Studi di Milano, Italy (catalogue No. 2009-1).
Geological Setting of Type Material:
Cossaite was found on altered pyroclastic breccia at the F5AT medium-temperature fumarole (T ~350ºC), which is located at the rim of La Fossa crater.

Physical Properties of Cossaite

Diaphaneity (Transparency):
2.08(1) g/cm3 (Measured)    2.075 g/cm3 (Calculated)

Crystallography of Cossaite

Crystal System:
Class (H-M):
3 - Rhombohedral
Space Group:
Cell Parameters:
a = 22.023(2) Å, c = 9.237(2) Å
a:c = 1 : 0.419
Unit Cell Volume:
V 3,879.85 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
10.997 (50)
4.584 (25)
4.152 (100)
3.873 (70)
2.770 (20)
2.345 (17)
2.166 (20)

Chemical Properties of Cossaite

(Mg0.5,◻)Al6(SO4)6(HSO4)F6 · 36H2O

The earlier proposed formula NaAl6(SO4)6(SO3F)F6.36H2O is false (see Demartin et al., 2011).
Elements listed in formula:
Analytical Data:
Average of 6 electron microprobe analyses (water content calculated from the stoichiometry).
MgO (1.4)
Al2O3 (19.5)
SO3 (34.7)
F (5.7)
H2O (40.85)
O=F (-2.40)
Total (99.75)

Other Names for Cossaite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Cossaite

Reference List:
Campostrini, I., Demartin, F., Gramaccioli, C.M. (2010) Vulcano: ein außergewöhnlicher Fundpunkt von neuen und seltenen Mineralien. Mineralien-Welt: 21: 40-57. (in German)

Campostrini, I., Demartin, F., Gramaccioli, C.M., Russo, M. (2011) Vulcano Tre secoli di mineralogia. Associazione Micro-mineralogica Italiana: 344 pages.

Demartin, F., Gramaccioli, C.M., Campostrini, I., Castellano, C. (2011) Cossaite, (Mg0.5,◻)Al6(SO4)6(HSO4)F6.36H2O, a new mineral from La Fossa crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine: 75: 2847-2855.

Camara, F., Diego Gatta, G., Belakovskiy, D., Smith, D.G.W., Tait, K.T. (2013) New mineral names. American Mineralogist: 98: 1078-1083.

Internet Links for Cossaite URL:
Please feel free to link to this page.

Localities for Cossaite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy (TL)
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Campostrini, I., Demartin, F. & Gramaccioli, C.M. (2010): Vulcano: ein außergewöhnlicher Fundpunkt von neuen und seltenen Mineralien. Mineralien-Welt, 21 (3), 40-57 (in German).
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