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Demicheleite-(I)

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About Demicheleite-(I)Hide

Formula:
BiSI
Colour:
dark red to black
Lustre:
Sub-Metallic
Specific Gravity:
6.411 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for its relationship to demicheleite-(Br) and demicheleite-(Cl), with dominant I. The root name honors Vincenzo de Michele (b. 1936), former curator of the Natural History Museum, Milan, Italy.
I-dominant analogue of demicheleite-(Br) and demicheleite-(Cl). Unique combination of elements. The only Bi-I mineral known (compare the experimentally obtained phase: Unnamed (Pb-Bi iodide)). The other sulfide-iodide minerals are mutnovskite, perroudite, and radtkeite.


Classification of Demicheleite-(I)Hide

Approved
Approval Year:
2009
First Published:
2010
2.FC.

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)

Physical Properties of Demicheleite-(I)Hide

Sub-Metallic
Transparency:
Translucent
Colour:
dark red to black
Streak:
Brown
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
None observed
Density:
6.411 g/cm3 (Calculated)

Chemical Properties of Demicheleite-(I)Hide

Formula:
BiSI

Crystallography of Demicheleite-(I)Hide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 8.4501(7) Å, b = 10.1470(9) Å, c = 4.1389(4) Å
Ratio:
a:b:c = 0.833 : 1 : 0.408
Unit Cell V:
354.88 ų (Calculated from Unit Cell)
Morphology:
Prismatic, with dominant forms {110} and {111}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.490(100)
4.346(94)
3.896(90)
3.243(22)
2.999(22)
2.709(60)
2.466(21)
2.161(38)

Type Occurrence of Demicheleite-(I)Hide

Place of Conservation of Type Material:
Dipartimento di Chimica Strutturale e Stereochimica Inorganica of Universita degli Studi di Milano, No. 2009-02.
Reference:
Demartin, F., Gramaccioli, C.M., Campostrini, I. (2010) Demicheleite-(I), BiSI, a new mineral from La Fossa Crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine: 74: 141-145.

Synonyms of Demicheleite-(I)Hide

Related Minerals - Nickel-Strunz GroupingHide

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-(Br)BiSBrOrth. mmm (2/m 2/m 2/m) : Pnma
2.FC.25Demicheleite-(Cl)BiSClOrth. mmm (2/m 2/m 2/m) : Pnma

Fluorescence of Demicheleite-(I)Hide

Not fluorescent

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-(I)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Demartin, F., Gramaccioli, C.M., Campostrini, I. (2010) Demicheleite-(I), BiSI, a new mineral from La Fossa Crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine: 74: 141-145.

Internet Links for Demicheleite-(I)Hide

Localities for Demicheleite-(I)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
Demartin, F., Gramaccioli, C.M., Campostrini, I. (2010): Demicheleite-(I), BiSI, a new mineral from La Fossa Crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine, 74, 141-145.
Mineral and/or Locality  
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