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Cossaite

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Formula:
(Mg
 
0.5
,◻)Al
 
6
(SO
 
4
)
 
6
(HSO
 
4
)F
 
6
· 36H
 
2
O
The earlier proposed formula NaAl6(SO4)6(SO3F)F6.36H2O is false (see Demartin et al., 2011).
System:TrigonalColour:Colourless
Name:Named for Alfonso Cossa (1833-1902), for his work on the minerals and rocks of Vulcano [http://www.platinummetalsreview.com/pdf/pmr-v34-i4-215-221.pdf]
This page provides mineralogical data about Cossaite.

Classification of Cossaite

IMA status:Approved 2009
mindat.org URL:http://www.mindat.org/min-39568.html
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Type Occurrence of Cossaite

Type Locality:La Fossa crater, Vulcano Island, Lipari, Eolie Islands (Aeolian Islands), Messina Province, Sicily, Italy
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).
Year of Discovery:2009
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

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Colourless
Streak:White
Tenacity:Brittle
Fracture:Irregular/Uneven
Density (measured):2.08(1) g/cm3
Density (calculated):2.075 g/cm3

Crystallography of Cossaite

Crystal System:Trigonal
Class (H-M):3 - Rhombohedral
Space Group:R3
Cell Parameters:a = 22.023(2) Å, c = 9.237(2) Å
Ratio:a:c = 1 : 0.419
Unit Cell Volume:V 3,879.85 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
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

Formula:
(Mg
 
0.5
,◻)Al
 
6
(SO
 
4
)
 
6
(HSO
 
4
)F
 
6
· 36H
 
2
O


The earlier proposed formula NaAl6(SO4)6(SO3F)F6.36H2O is false (see Demartin et al., 2011).
Simplified for copy/paste:(Mg0.5,◻)Al6(SO4)6(HSO4)F6·3
Essential elements:Al, F, H, Mg, O, S
All elements listed in formula:Al, F, H, Mg, O, S
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)
Empirical Formula:
Mg
 
0.56
Al
 
6.19
S
 
7.01
H
 
73.37
F
 
4.85
O
 
65.15

Other Names for Cossaite

Synonyms:
IMA2009-031
Other Languages:

Other Information

Health Warning: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 (3), 40-57 (in German).

http://www.socminpet.it/Uploads/Pubblicazioni/Vulcano_2011.pdf
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.

Internet Links for Cossaite

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  • Localities for Cossaite

    The 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. ? 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
     
    • 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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