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Demicheleite-(Cl)
A valid IMA mineral species
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About Demicheleite-(Cl)
Formula:
BiSCl
Colour:
Dark red to black
Lustre:
Sub-Metallic
Specific Gravity:
5.934 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for its relationship to demicheleite-(Br), with dominant Cl. The root name honors Vincenzo de Michele (b. 1936), former curator of the Natural History Museum, Milan, Italy.
Type Locality:
Isostructural with:
Cl-analogue of dsemicheleite-(Br) and demicheleite-(I). Stoichiometrically similar to bismoclite (BiOCl). Other Bi-bearing chlorides: argesite, steropesite.
Unique Identifiers
Mindat ID:
38694
Long-form identifier:
mindat:1:1:38694:2
Similar Names
| Demicheleite | ||
| Demicheleite-(Br) | A valid IMA mineral species | BiSBr |
| Demicheleite-(I) | A valid IMA mineral species | BiSI |
IMA Classification of Demicheleite-(Cl)
Approved
IMA Formula:
Bi3+S2-Cl
Approval year:
2008
First published:
2009
Classification of Demicheleite-(Cl)
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 : 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)
2.15.14.2
2 : SULFIDES
15 : Chlor-sulfides
2 : SULFIDES
15 : Chlor-sulfides
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Dem-Cl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Demicheleite-(Cl)
Sub-Metallic
Transparency:
Translucent
Colour:
Dark red to black
Streak:
Brown
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
None observed
Density:
5.934 g/cm3 (Calculated)
Chemistry of Demicheleite-(Cl)
Mindat Formula:
BiSCl
Element Weights:
Elements listed:
Crystallography of Demicheleite-(Cl)
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 7.802 Å, b = 9.930 Å, c = 3.990 Å
Ratio:
a:b:c = 0.786 : 1 : 0.402
Unit Cell V:
309.12 ų (Calculated from Unit Cell)
Morphology:
Prismatic with {110} as the dominant form, terminated by minor faces of another prism {011}, a pinacoid {010}, and a bipyramid {111}.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0004960 | Demicheleite-(Cl) | Demartin F, Gramaccioli C M, Campostrini I (2009) Demicheleite-(Cl), BiS,Cl, a new mineral from La Fossa crater, Vulcano, Aeolian Islands, Italy American Mineralogist 94 1045-1048 |  | 2009 | La Fossa crater, Vulcano, Aeolian Islands, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.174 Å | (45) |
| 2.896 Å | (100) |
| 2.784 Å | (33) |
| 2.684 Å | (42) |
| 2.543 Å | (27) |
| 2.044 Å | (23) |
| 1.992 Å | (25) |
| 1.725 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 11 : Volcanic fumarole minerals; reduced phases (see also #45) |
Type Occurrence of Demicheleite-(Cl)
Place of Conservation of Type Material:
Dipartimento di Chimica Strutturale e Stereochimica Inorganica of Università degli Studi di Milano, no. 2008-3.
Synonyms of Demicheleite-(Cl)
Demicheleite (in part)
Other Language Names for Demicheleite-(Cl)
Dutch:Demicheleiet-(Cl)
German:Demicheleit-(Cl)
Related Minerals - Strunz-mindat Grouping
| 2.FC. | Demicheleite-(I) | BiSI |
| 2.FC.05 | Djerfisherite | K6(Fe,Cu,Ni)25S26Cl |
| 2.FC.05 | Owensite | (Ba,Pb)6(Cu,Fe,Ni)25S27 |
| 2.FC.05 | Thalfenisite | Tl6(Fe,Ni,Cu)25S26Cl |
| 2.FC.05 | Gmalimite | K6◻Fe2+24S27 |
| 2.FC.05 | 'Cu-djerfisherite' | K6(Cu,Fe)25S26Cl |
| 2.FC.05 | Zoharite | (Ba,K)6(Fe,Cu,Ni)25S27 |
| 2.FC.10 | Bartonite | K6Fe20S26S |
| 2.FC.10 | Chlorbartonite | K6Fe24S26(Cl,S) |
| 2.FC.15d | Radtkeite | Hg2+3S2ICl |
| 2.FC.15a | Lavrentievite | Hg3S2Cl2 |
| 2.FC.15a | Corderoite | Hg2+3S2Cl2 |
| 2.FC.15a | 'Arzakite' | Hg2+3S2(Br,Cl)2 |
| 2.FC.15c | Grechishchevite | Hg2+3S2(Br,Cl,I)2 |
| 2.FC.15b | Kenhsuite | Hg2+3S2Cl2 |
| 2.FC.20b | Iltisite | HgAgSCl |
| 2.FC.20c | Perroudite | Hg5Ag4S5(I,Br)2Cl2 |
| 2.FC.20a | Capgaronnite | AgHgClS |
| 2.FC.20d | Hanauerite | AgHgSI |
| 2.FC.25 | Demicheleite-(Br) | BiSBr |
Fluorescence of Demicheleite-(Cl)
Not fluorescent
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.
Internet Links for Demicheleite-(Cl)
mindat.org URL:
https://www.mindat.org/min-38694.html
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References for Demicheleite-(Cl)
Reference List:
Demartin, F., Gramaccioli, C. M., Campostrini, I. (2009) Demicheleite-(Cl), BiSCl, a new mineral from La Fossa crater, Vulcano, Aeolian Islands, Italy. American Mineralogist, 94 (7) 1045-1048 doi:10.2138/am.2009.3200
Localities for Demicheleite-(Cl)
Showing 3 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Matýsek et al. (2022) |
Greece | |
| Uwe Kolitsch and Branko Rieck analyses (see also http://lavrion.gr/Minerals/Updates.html) |
Italy (TL) | |
| Am.Min. 94 (2009) |
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La Fossa crater, Vulcano Island, Lipari, Eolie Islands, Metropolitan City of Messina, Sicily, Italy