Ciriottiite
A valid IMA mineral species
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About Ciriottiite
Marco E. Ciriotti
Formula:
Cu(Cu,Ag)3Pb19(Sb,As)22(As2)S56
Colour:
Black
Lustre:
Metallic
Hardness:
3 - 3½
Specific Gravity:
5.948 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named in honour of Marco Ernesto Ciriotti (b. 1945), Italian amateur mineralogist at the University of Turin and founding member of the Italian Micromineralogical Association, for his longstanding contribution to mineral systematics.
The Cu analogue of sterryite. Ciriottiite can also be described as an expanded derivative of owyheeite. Related to meerschautite.
Unique Identifiers
Mindat ID:
46686
Long-form identifier:
mindat:1:1:46686:8
IMA Classification of Ciriottiite
Approved
IMA Formula:
Cu1+4Pb2+19(Sb3+,As3+,Bi3+)22(As2)4+S2-56
Approval year:
2015
First published:
2016
Classification of Ciriottiite
2.LB.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
B : With essential Pb
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
B : With essential Pb
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 |
|---|---|---|
| Cit | 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 Ciriottiite
Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
3 - 3½ on Mohs scale
Hardness:
VHN10=190 - 219 kg/mm2 - Vickers
Tenacity:
Brittle
Density:
5.948 g/cm3 (Calculated)
Comment:
Calculated based on the empirical chemical formula; ideal formula gives 5.918 g/cm3.
Optical Data of Ciriottiite
Anisotropism:
Distinctly with brownish to greenish rotation tints.
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 471nm | 33.2% | 37.8% |
| 548nm | 31.8% | 35.3% |
| 586nm | 31.0% | 34.7% |
| 652nm | 27.9% | 32.5% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 37.8%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Light grey (in plane-polarized incident light)
Internal Reflections:
Absent
Chemistry of Ciriottiite
Mindat Formula:
Cu(Cu,Ag)3Pb19(Sb,As)22(As2)S56
Element Weights:
Crystallography of Ciriottiite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.178(2) Å, b = 28.223(6) Å, c = 42.452(5) Å
β = 93.55(2)°
β = 93.55(2)°
Ratio:
a:b:c = 0.29 : 1 : 1.504
Unit Cell V:
9779.5 ų
Z:
4
Comment:
Space group P21/n.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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Rotation
Stop | Start
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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) |
|---|---|---|---|---|---|---|---|
| 0020592 | Ciriottiite | Bindi L, Biagioni C, Martini B, Salvetti A (2016) Ciriottiite, Cu(Cu,Ag)3Pb19(Sb,As)22(As2)S56, the Cu-analogue of sterryite from the Tavagnasco Mining District, Piedmont, Italy Minerals 6 8 | 2016 | Tavagnasco Mining District, Piedmont, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.641 Å | (100) |
| 3.595 Å | (35) |
| 3.238 Å | (82) |
| 3.208 Å | (57) |
| 2.936 Å | (54) |
| 2.928 Å | (37) |
| 2.800 Å | (36) |
| 2.043 Å | (78) |
Locality:
Reference:
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Ciriottiite
General Appearance of Type Material:
As black tubular crystals, up to 150 μm in length and few μm thick.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Museo di Storia Naturale, Universita` di Firenze, Via La Pira 4, Florence, Italy, catalogue number 3161/I
Geological Setting of Type Material:
The Tavagnasco Pb-Bi-Zn-As-Fe-Cu hydrothermal ore district, Italy.
Associated Minerals at Type Locality:
Synonyms of Ciriottiite
Other Language Names for Ciriottiite
Dutch:Ciriottiiet
German:Ciriottiit
Relationship of Ciriottiite to other Species
Member of:
Other Members of Sterryite Group:
| Hayyanite | Cu5Ag11Pb76Sb71As17(As2+)8S224 | Mon. 2/m : P21/b |
| Parasterryite | Ag4Pb20Sb14As10S58 | Mon. 2/m : P21/b |
| Sterryite | Cu(Ag,Cu)3Pb19(Sb,As)22(As2)S56 | Mon. 2/m |
Common Associates
Related Minerals - Strunz-mindat Grouping
| 2.LB. | Hayyanite | Cu5Ag11Pb76Sb71As17(As2+)8S224 |
| 2.LB. | Wenqingite | Pb5(AsS3)2(Ge2S6) |
| 2.LB.05 | Miharaite | Cu4FePbBiS6 |
| 2.LB.30 | Launayite | Cu2Pb20(Sb,As)26S60 |
| 2.LB.30 | Ardaite | Pb19Sb13S35Cl7 |
| 2.LB.30 | Sorbyite | CuPb9(Sb,As)11S26 |
| 2.LB.30 | Playfairite | Pb16(Sb,As)19S44Cl |
| 2.LB.30 | Sterryite | Cu(Ag,Cu)3Pb19(Sb,As)22(As2)S56 |
| 2.LB.30 | Madocite | Pb19(Sb,As)16S43 |
| 2.LB.35 | Larosite | (Cu,Ag)21PbBiS13 |
| 2.LB.40 | Mazzettiite | Ag3HgPbSbTe5 |
| 2.LB.40 | Petrovicite | Cu3HgPbBiSe5 |
| 2.LB.45 | Crerarite | Pt2-x(Bi,Pb)11(S,Se)11 |
| 2.LB.50 | Quijarroite | Cu6HgPb2Bi4Se12 |
| 2.LB.55 | Znamenskyite | Pb4In2Bi4S13 |
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 Ciriottiite
mindat.org URL:
https://www.mindat.org/min-46686.html
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References for Ciriottiite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter 26. Mineralogical Magazine, 79 (4) 941-947 doi:10.1180/minmag.2015.079.4.05
Localities for Ciriottiite
Showing 2 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.
Italy | |
| Ciriotti et al. (2019) |
| Bindi et al. (2016) |
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Espérance tunnel, Tavagnasco Mines, Tavagnasco, Metropolitan City of Turin, Piedmont, Italy