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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).
Specific Gravity:
Crystal System:
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.

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Classification of CossaiteHide

Approval Year:

Physical Properties of CossaiteHide

2.08(1) g/cm3 (Measured)    2.075 g/cm3 (Calculated)

Chemical Properties of CossaiteHide

(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).
IMA Formula:
(Mg0.5,◻)Al6(SO4)6(HSO4)F6 · 36H2O

Crystallography of CossaiteHide

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 V:
3,879.85 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
10.997 (50)
4.584 (25)
4.152 (100)
3.873 (70)
2.770 (20)
2.345 (17)
2.166 (20)

Type Occurrence of CossaiteHide

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.

Synonyms of CossaiteHide

Other Language Names for CossaiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Thermessaite1 photo of Cossaite associated with Thermessaite on

Other InformationHide

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 CossaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 CossaiteHide

Localities for CossaiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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