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Demicheleite-(Br)

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About Demicheleite-(Br)Hide

Formula:
BiSBr
Crystal System:
Orthorhombic
Name:
Originally described as demicheleite, but renamed demicheleite-(Br) after the approval of demicheleite-(Cl), a chlorine-dominant analogue. Honors Vincenzo de Michele (b. 1936), former curator of the Natural History Museum, Milan, Italy, and for its chemical composition.
The Br analogue of demicheleite-(Cl) and demicheleite-(I). Unique combination of elements. The only Bi-Br mineral known. The other sulfide-bromide minerals are 'arzakite' and grechishchevite.


Classification of Demicheleite-(Br)Hide

Approved
Approval Year:
2007
2.FC.25

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
C : With Cl, Br, I (halide-sulfides)
2.15.14.1

2 : SULFIDES
15 : Chlor-sulfides

Chemical Properties of Demicheleite-(Br)Hide

Formula:
BiSBr

Crystallography of Demicheleite-(Br)Hide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 8.0424 Å, b = 9.8511 Å, c = 4.0328 Å
Ratio:
a:b:c = 0.816 : 1 : 0.409
Unit Cell V:
319.50 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.220 (68)
3.740 (62)
3.721 (44)
2.909 (100)
2.429 (43)
2.036 (47)
1.865 (63)
1.774 (88)

Type Occurrence of Demicheleite-(Br)Hide

Synonyms of Demicheleite-(Br)Hide

Related Minerals - Nickel-Strunz GroupingHide

2.FC.Demicheleite-(I)BiSIOrth. mmm (2/m 2/m 2/m) : Pnma
2.FC.05DjerfisheriteK6(Fe,Cu,Ni)25S26ClIso. m3m (4/m 3 2/m) : Pm3m
2.FC.05ThalfenisiteTl6(Fe,Ni,Cu)25S26Cl
2.FC.05Owensite(Ba,Pb)6(Cu,Fe,Ni)25S27Iso. m3m (4/m 3 2/m) : Pm3m
2.FC.10BartoniteK6Fe20S26STet. 4/mmm (4/m 2/m 2/m) : I4/mmm
2.FC.10ChlorbartoniteK6Fe24S26(Cl,S)Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
2.FC.15aArzakiteHg2+3S2(Br,Cl)2Mon.
2.FC.15aCorderoiteHg2+3S2Cl2Iso. m3 (2/m 3)
2.FC.15cGrechishcheviteHg2+3S2(Br,Cl,I)2Tet.
2.FC.15aLavrentieviteHg2+3S2(Cl,Br)2Mon.
2.FC.15dRadtkeiteHg2+3S2IClMon. 2/m : B2/m
2.FC.15bKenhsuiteHg2+3S2Cl2Orth.
2.FC.20aCapgaronniteAgHgClSOrth.
2.FC.20cPerrouditeHg5Ag4S5(I,Br)2Cl2Orth. 2 2 2 : P21 21 2
2.FC.20bIltisiteHgAgS(Cl,Br)Hex.
2.FC.25Demicheleite-(Cl)BiSClOrth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Dana Grouping (8th Ed.)Hide

2.15.14.2Demicheleite-(Cl)BiSClOrth. mmm (2/m 2/m 2/m) : Pnma

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 Demicheleite-(Br)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Voutsas, G.P. and P.J. Rentzeperis (1984): The crystal structure of bismuth sulfide bromide, BiSBr, Zeitschrift für Kristallographie 166, 153-158.
Gramaccioli, C. M., Demartin, F., Campostrini, I., Orlandi, P. (2008): Demicheleite, BiSBr, a new mineral from La Fossa crater, Vulcano, Aeolian Islands, Italy. American Mineralogist, 93, 1603–1607.

Internet Links for Demicheleite-(Br)Hide

Localities for Demicheleite-(Br)Hide

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.
Italy (TL)
 
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Gramaccioli, C. M., Demartin, F., Campostrini, I., Orlandi, P. (2008): Demicheleite, BiSBr, a new mineral from La Fossa crater, Vulcano, Aeolian Islands, Italy. American Mineralogist, 93, 1603–1607.
Mineral and/or Locality  
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