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Lafossaite

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About LafossaiteHide

Formula:
Tl(Cl,Br)
Colour:
Grey-brown
Lustre:
Resinous, Greasy
Hardness:
3 - 4
Specific Gravity:
7.212 (Calculated)
Crystal System:
Isometric
Name:
After the type locality the La Fossa crater, Vulcano Island, Eolie Islands (Aeolian Islands), Lipari, Messina Province, Sicily, Italy.
Chemically the Cl analogue of nataliyamalikite (which, however, has a different crystal structure).

See also UM1998-03-Cl:Tl.


Classification of LafossaiteHide

Approved
Approval Year:
2003
3.AA.25

3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.

Physical Properties of LafossaiteHide

Resinous, Greasy
Transparency:
Translucent
Colour:
Grey-brown
Streak:
off white to cream
Hardness:
3 - 4 on Mohs scale
Hardness Data:
Estimated
Tenacity:
Malleable
Fracture:
Sub-Conchoidal
Density:
7.212 g/cm3 (Calculated)

Optical Data of LafossaiteHide

Type:
Isotropic
RI values:
n = 2.264
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High
Type:
Isotropic
Colour in reflected light:
Grey - white
Internal Reflections:
white
Pleochroism:
Non-pleochroic

Chemical Properties of LafossaiteHide

Formula:
Tl(Cl,Br)
IMA Formula:
TlCl

Crystallography of LafossaiteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Pm3m
Cell Parameters:
a = 3.8756 Å
Unit Cell V:
58.212 ų
Z:
1
Morphology:
cubes to octahedra

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.887Å(80)
2.745Å(100)
2.237Å(55)
1.937Å(50)
1.733Å(45)
1.583Å(70)
Comments:
From type description.

Type Occurrence of LafossaiteHide

Place of Conservation of Type Material:
ETH Zurich
Geological Setting of Type Material:
Fumarole

Synonyms of LafossaiteHide

Other Language Names for LafossaiteHide

Simplified Chinese:铊盐
Traditional Chinese:鉈鹽

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Lafossaite associated with ThalcusiteTl2Cu3FeS4
1 photo of Lafossaite associated with PolylithioniteKLi2Al(Si4O10)(F,OH)2
1 photo of Lafossaite associated with RealgarAs4S4

Related Minerals - Nickel-Strunz GroupingHide

3.AA.Brontesite(NH4)3PbCl5Orth. mmm (2/m 2/m 2/m) : Pnma
3.AA.05MarshiteCuIIso. 4 3m : F4 3m
3.AA.05Miersite(Ag,Cu)IIso. 4 3m : F4 3m
3.AA.05NantokiteCuClIso. 4 3m : F4 3m
3.AA.05UM1999-11:I:CuSCu(I,S)
3.AA.10IodargyriteAgIHex. 6mm : P6mm
3.AA.10Tocornalite(Ag,Hg)I
3.AA.15BromargyriteAgBrIso. m3m (4/m 3 2/m) : Fm3m
3.AA.15ChlorargyriteAgClIso. m3m (4/m 3 2/m) : Fm3m
3.AA.20CarobbiiteKFIso. m3m (4/m 3 2/m)
3.AA.20GriceiteLiFIso. m3m (4/m 3 2/m) : Fm3m
3.AA.20HaliteNaClIso. m3m (4/m 3 2/m) : Fm3m
3.AA.20SylviteKClIso. m3m (4/m 3 2/m) : Fm3m
3.AA.20VilliaumiteNaFIso. m3m (4/m 3 2/m) : Fd3m
3.AA.25SalammoniacNH4ClIso. 4 3 2
3.AA.25UM1998-03-Cl:TlTlCl
3.AA.30Calomel(Hg2)2+Cl2Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.AA.30Kuzminite(Hg2+2)(Br,Cl)2Tet.
3.AA.30Moschelite(Hg2+2)I2Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.AA.35NeighboriteNaMgF3Orth. mmm (2/m 2/m 2/m)
3.AA.40ChlorocalciteKCaCl3Orth. mmm (2/m 2/m 2/m) : Pnma
3.AA.45KolaritePbTeCl2Orth.
3.AA.50RadhakrishnaitePbTe3(Cl,S)2Tet.
3.AA.55ChallacolloiteKPb2Cl5Mon. 2/m : P21/b
3.AA.60HephaistositeTlPb2Cl5Mon. 2/m : P21/b

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 LafossaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Roberts, A.C., Venance, K.E., Seward, T.M., Grice J.D., Paar, W.H. (2006) Lafossaite a new mineral from the La Fossa Crater, Vulcano, Italy. Mineralogical Record: 37: 165-168.

Internet Links for LafossaiteHide

Localities for LafossaiteHide

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.
China
 
  • Anhui
    • Ma'anshan
      • He County
Fan, Y., Zhou T., Yuan F., Wu M. (2014): Geological and geochemical constraints on the genesis of the Xiangquan Tl-only deposit, eastern China. Ore Geology Reviews, 59, 97-108.; Fan, Y., Zhou, T., Yuan, F., & Wu, M. (2014). Geological and geochemical constraints on the genesis of the Xiangquan Tl-only deposit, eastern China. Ore Geology Reviews, 59, 97-108.
Denmark
 
  • Greenland
    • Kujalleq
      • Narsaq
        • Ilímaussaq complex
Pavel M. Kartashov analytical data (2007)
Italy
 
  • Campania
    • Naples
      • Somma-Vesuvius Complex
Campostrini, I. & Russo, M. (2012): Lafossaite e dimorphite: due nuove specie per il Vesuvio. Micro, 3/2012, 136-141
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
ROBERTS, A.C., VENANCE, K.E., SEWARD, T.M., GRICE J.D., PAAR, W.H. (2006): Lafossaite a new mineral from the La Fossa Crater, Vulcano, Italy. - Mineralogical Record - 37, 165-168.
North Macedonia
 
  • Kavadarci Municipality
    • Rožden (Rozhden; Roszdan)
Desor, J (2018). SEM-EDS analysis on material from Allchar; EDS analyzed by Joy Desor.
Poland
 
  • Silesian Voivodeship
    • Wodzisław Co.
      • Radlin
Ł. Kruszewski EDS data
 
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