Classification of Cossaite |
| IMA status: | Approved 2009 |
|---|
| mindat.org URL: | http://www.mindat.org/min-39568.html
Please feel free to link to this page. |
|---|
Type Occurrence of Cossaite |
| Type Locality: | La Fossa crater, Vulcano Island, Eolie Islands (Aeolian Islands), Lipari, 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-spacing | | Intensity | | 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 | | ,◻)Al | | (SO | | ) | | (HSO | | )F | | · 36H | | O |
The earlier proposed formula NaAl6(SO4)6(SO3F)F6.36H2O is false (see Demartin et al., 2011). |
|---|
| 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: | |
|---|
Other Names for Cossaite |
| Synonyms: | |
|---|
| 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:
- + | |
|---|
Internet Links for Cossaite |
| Search Engines: |
Look for Cossaite on Google
Look for Cossaite images on Google |
|---|
| External Links: | Look for Cossaite on WebmineralLook for Cossaite on Athena Mineralogy[Link Broken?]Look for Cossaite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure Database |
|---|
| Mineral Dealers: | Edwards Minerals - Fine SpecimensRare and Unusual minerals at Mineralogical Research CompanySearch for Cossaite from all mineral dealers at minfind.comDAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.Buy from David K Joyce mineralsTop quality minerals from Kristalle of CaliforniaSpiriferMinerals.com - high quality low pricesSearch for minerals at HeliodorFabre Minerals - search for Cossaite specimensMineral Classics - Worldwide Collector Quality Minerals and GemsSearch for - Cossaite - on e-Rocks Mineral Sales & AuctionsWilensky Fine Minerals |
|---|
| Jobs: | Mining & Geology Jobs |
|---|
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.
|
|
Mineral and Locality Search
