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Cossaite

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Formula:
(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).
System:
Trigonal
Colour:
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

Approved 2009
mindat.org URL:
http://www.mindat.org/min-39568.html
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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).
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

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

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 Data:
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:
(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).
Essential elements:
All 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)
Empirical Formula:
Mg0.56Al6.19S7.01H73.37F4.85O65.15

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 (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

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).
Mineral and/or Locality  
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