Mineralogy Database

Demicheleite-(Br) Mineral Data

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General Demicheleite-(Br) Information

Help on Chemical Formula: Chemical Formula: BiSBr
Help on Composition: Composition: Molecular Weight = 306.48 gm
   Bismuth   67.51 %  Bi
   Sulfur    10.15 %  S
   Iodine     0.83 %  I
   Bromine   17.47 %  Br
   Chlorine   4.05 %  Cl
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Bi0.99S0.97Br0.67Cl0.35I0.02
Help on Environment: Environment: Found in an active high-temperature fumarole at the crater rim. New structure type.
Help on IMA Status: IMA Status: Approved IMA 2007 (Dana # Added)
Help on Locality: Locality: La Fossa crater, Vulcano, Aeolian Islands, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Vincenzo de Michele (b. 1936), former curator of the Section of Mineralogy of the Museo di Storia Naturale, Milan, Italy.
Help on Synonym: Synonym: IMA2007-022
 

Demicheleite-(Br) Image

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  Demicheleite-(Br)

Comments: (SEM) image (BSE) of demicheleite. (AmMin, v93:1603).
Location: La Fossa crater, Vulcano, Aeolian Islands, Italy. Scale: See Image.
© American Mineralogist

Demicheleite-(Br) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.8163:1:0.4093
Help on Cell Dimensions: Cell Dimensions: a = 8.0424, b = 9.8511, c = 4.0328, Z = 4; V = 319.50 Den(Calc)= 6.37
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.909(1), 1.774(0.88), 4.22(0.68),1.865(0.63), 3.74(0.62), 2.036(0.47), 3.721(0.44), 2.429(0.43),
 

Physical Properties of Demicheleite-(Br)

Help on Cleavage: Cleavage: None
Help on Color: Color: Dark red, Black.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: red
 

Calculated Properties of Demicheleite-(Br)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.33 gm/cc
note: Specific Gravity of Demicheleite-(Br) =6.37 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0007618424
Boson Index = 0.9992381576
Help on Photoelectric: Photoelectric: PEDemicheleite-(Br) =1,319.88 barns/electron
U=PEDemicheleite-(Br) x rElectron Density=7,031.12 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Demicheleite-(Br) is Not Radioactive
 

Demicheleite-(Br) Classification
Help on Dana Class: Dana Class: 09.01.09.02 (09)Anhydrous and Hydrated Halides
  (09.01)where A X
  (09.01.09)Demicheleite Group
 
09.01.09.01 Demicheleite-(Cl)! BiSCl Pnam 2/m 2/m 2/m
 
09.01.09.02 Demicheleite-(Br)! BiSBr Pnam 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 02.FC.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O
  02.FC -With Cl, Br, I (halide-sulfides)
 
02.FC.25 Demicheleite-(Br)! BiSBr Pnam 2/m 2/m 2/m
 
02.FC.25 Demicheleite-(Cl)! BiSCl Pnam 2/m 2/m 2/m
 

Other Demicheleite-(Br) Information
Help on References: References: NAME( AmMin, v93:1603) PHYS. PROP.(AmMin, v93:1603) OPTIC PROP.(AmMin, v93:1603)
Help on See Also: See Also: Links to other databases for Demicheleite-(Br) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Demicheleite-(Br)

BiSBr
Dana No: 09.01.09.02 Strunz No: 02.FC.25
Locality:

 

Notes:

 
 
   
 

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