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Lafossaite

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Formula:
TlCl
System:
Isometric
Colour:
Grey-brown
Lustre:
Resinous, Greasy
Hardness:
3 - 4
Name:
After the type locality the La Fossa crater, Vulcano Island, Eolie Islands (Aeolian Islands), Lipari, Messina Province, Sicily, Italy.
See also UM1998-03-Cl:Tl. Not an analogue of natalyamalikite.


Classification of Lafossaite

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 Lafossaite

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

Optical Data of Lafossaite

Type:
Isotropic
RI values:
n = 2.264
Max Birefringence:
δ = 0.000 - 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 Lafossaite

IMA Formula:
TlCl
Elements listed in formula:

Crystallography of Lafossaite

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Pm3m
Cell Parameters:
a = 3.8756 Å
Unit Cell Volume:
V 58.212 ų
Z:
1
Morphology:
cubes to octahedra
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.887(80)
2.745(100)
2.237(55)
1.937(50)
1.733(45)
1.583(70)
Comments:
From type description.

Type Occurrence of Lafossaite

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

Relationship of Lafossaite to other Species

3.AA.05MarshiteCuI
3.AA.05Miersite(Ag,Cu)I
3.AA.05NantokiteCuCl
3.AA.05UM1999-11:I:CuSCu(I,S)
3.AA.10IodargyriteAgI
3.AA.10Tocornalite(Ag,Hg)I
3.AA.15BromargyriteAgBr
3.AA.15ChlorargyriteAgCl
3.AA.20CarobbiiteKF
3.AA.20GriceiteLiF
3.AA.20HaliteNaCl
3.AA.20SylviteKCl
3.AA.20VilliaumiteNaF
3.AA.25SalammoniacNH4Cl
3.AA.25UM1998-03-Cl:TlTlCl
3.AA.30CalomelHgCl
3.AA.30KuzminiteHg(Br,Cl)
3.AA.30MoscheliteHgI
3.AA.35NeighboriteNaMgF3
3.AA.40ChlorocalciteKCaCl3
3.AA.45KolaritePbTeCl2
3.AA.50RadhakrishnaitePbTe3(Cl,S)2
3.AA.55ChallacolloiteKPb2Cl5
3.AA.60HephaistositeTlPb2Cl5

Other Names for Lafossaite

Name in Other Languages:
Simplified Chinese:铊盐
Traditional Chinese:鉈鹽

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 Lafossaite

Reference List:
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 Lafossaite

mindat.org URL:
https://www.mindat.org/min-27521.html
Please feel free to link to this page.

Localities for Lafossaite

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.
(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.
China
 
  • Anhui Province
    • Ma'anshan Prefecture
      • He Co.
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.
Greenland
 
  • Kujalleq
    • Narsaq
      • Ilímaussaq complex
        • Taseq area
Pavel M. Kartashov analytical data (2007)
Italy
 
  • Campania
    • Naples Province
      • 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.
Poland
 
  • Upper Silesia (Śląskie)
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
        • Radlin
Ł. Kruszewski EDS data
Mineral and/or Locality  
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