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Demicheleite-(Br)

Formula:
BiSBr
System:Orthorhombic
Name:Originally described as Demicheleite,but renamed Demicheleite-(Br) after the the approval of a Demicheleite-(cl) a chlorine-dominant analogue.
Isostructural with:Demicheleite-(Cl)
This page provides mineralogical data about Demicheleite-(Br).

Classification of Demicheleite-(Br)

IMA status:Approved 2007
Nickel-Strunz 10th (pending) edition ID: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)
Dana 8th edition ID:2.15.14.1

2 : SULFIDES
15 : Chlor-sulfides
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Type Occurrence of Demicheleite-(Br)

Type Locality:La Fossa Crater, Vulcano Island, Eolie Islands (Aeolian Islands), Lipari, Messina Province, Sicily, Italy

Crystallography of Demicheleite-(Br)

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pnma {P21/n 21/m 21/a}
Cell Parameters:a = 8.0424Å, b = 9.8511Å, c = 4.0328Å
Ratio:a:b:c = 0.816 : 1 : 0.409
Unit Cell Volume:V 319.50 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
4.220 (68)
3.740 (62)
3.721 (44)
2.909 (100)
2.429 (43)
2.036 (47)
1.865 (63)

Chemical Properties of Demicheleite-(Br)

Formula:
BiSBr
Essential elements:Bi, Br, S
All elements listed in formula:Bi, Br, S

Relationship of Demicheleite-(Br) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.FC.05Djerfisherite
K
 
6
(Cu,Fe,Ni)
 
25
S
 
26
Cl
2.FC.05Thalfenisite
Tl
 
6
(Fe,Ni,Cu)
 
25
S
 
26
Cl
2.FC.05Owensite
(Ba,Pb)
 
6
(Cu,Fe,Ni)
 
25
S
 
27
2.FC.10Bartonite
K
 
3
Fe
 
10
S
 
14
2.FC.10Chlorbartonite
K6Fe24S26(Cl,S)
2.FC.15aArzakite
Hg
2+
3
[(Br,Cl)
 
2
|S
 
2
]
2.FC.15aCorderoite
Hg
2+
3
[Cl
 
2
|S
 
2
]
2.FC.15cGrechishchevite
Hg
2+
3
[(Br,Cl,I)
 
2
|S
 
2
]
2.FC.15aLavrentievite
Hg
2+
3
[(Cl,Br)
 
2
|S
 
2
]
2.FC.15dRadtkeite
Hg
2+
3
[Cl|I|S
 
2
]
2.FC.15bKenhsuite
Hg
2+
3
[Cl
 
2
|S
 
2
]
2.FC.20aCapgaronnite
HgS·Ag(Cl,Br,I)
2.FC.20cPerroudite
Hg
 
5
Ag
 
4
S
 
5
I
 
2
Cl
 
2
2.FC.20bIltisite
HgSAg(Cl,Br)
2.FC.25Demicheleite-(Cl)
BiSCl

Other Names for Demicheleite-(Br)

Synonyms:
IMA2007-022
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 Demicheleite-(Br)

Reference List:Voutsas, G.P. and P.J. Rentzeperis (1984): The crystal structure of bismuth sulfide bromide, BiSBr, Zeitschrift fur 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)

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    Localities for Demicheleite-(Br)

    (TL) indicates type locality. ? 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
     
    • Sicily
      • Messina Province
        • Lipari
          • Eolie Islands (Aeolian Islands)
            • Vulcano Island
    		IMA website - Approved September 2007; Italo Campostrini list - 2008
    Mineral and/or Locality
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