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⇱ Ciriottiite: Mineral information, data and localities.

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Ciriottiite

A valid IMA mineral species
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About CiriottiiteHide

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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
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 IdentifiersHide

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Mindat ID:
46686
Long-form identifier:
mindat:1:1:46686:8

IMA Classification of CiriottiiteHide

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Approved
IMA Formula:
Cu4Pb19(Sb,As,Bi)22(As2)S56
Approval year:
2015
First published:
2016

Classification of CiriottiiteHide

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2.LB.

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
B : With essential Pb

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
CitIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of CiriottiiteHide

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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 CiriottiiteHide

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Anisotropism:
Distinctly with brownish to greenish rotation tints.
Reflectivity:
WavelengthR1 (%)R2 (%)
471nm33.2%37.8%
548nm31.8%35.3%
586nm31.0%34.7%
652nm27.9%32.5%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 37.8%.
R1 shown in black, R2 shown in
Colour in reflected light:
Light grey (in plane-polarized incident light)
Internal Reflections:
Absent

Chemistry of CiriottiiteHide

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Mindat Formula:
Cu(Cu,Ag)3Pb19(Sb,As)22(As2)S56
Element Weights:
Element% weight
Pb44.659 %
Sb30.388 %
S20.370 %
Cu2.884 %
As1.700 %

Calculated from ideal end-member formula.

Crystallography of CiriottiiteHide

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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)°
Ratio:
a:b:c = 0.29 : 1 : 1.504
Unit Cell V:
9779.5 ų
Z:
4
Comment:
Space group P21/n.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0020592CiriottiiteBindi 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 82016Tavagnasco Mining District, Piedmont, Italy0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
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)
Comments:
From Type Description.

Geological EnvironmentHide

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Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of CiriottiiteHide

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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 CiriottiiteHide

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Other Language Names for CiriottiiteHide

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Related Minerals - Strunz-mindat GroupingHide

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2.LB.HayyaniteCu5Ag11Pb76Sb71As17(As2+)8S224Mon. 2/m : P21/b
2.LB.WenqingitePb5(AsS3)2(Ge2S6)Mon. 2/m : P21/b
2.LB.05MiharaiteCu4FePbBiS6Orth.
2.LB.30LaunayiteCu2Pb20(Sb,As)26S60Mon. 2/m : P2/b
2.LB.30ArdaitePb19Sb13S35Cl7Mon.
2.LB.30SorbyiteCuPb9(Sb,As)11S26Mon. 2/m : B2/m
2.LB.30PlayfairitePb16(Sb,As)19S44ClMon.
2.LB.30SterryiteCu(Ag,Cu)3Pb19(Sb,As)22(As2)S56Mon. 2/m
2.LB.30MadocitePb19(Sb,As)16S43Orth.
2.LB.35Larosite(Cu,Ag)21PbBiS13Orth.
2.LB.40MazzettiiteAg3HgPbSbTe5Orth.
2.LB.40PetroviciteCu3HgPbBiSe5Orth.
2.LB.45CreraritePt2-x(Bi,Pb)11(S,Se)11Tric. 1 : P1
2.LB.50QuijarroiteCu6HgPb2Bi4Se12Orth. mm2 : Pmn21
2.LB.55ZnamenskyitePb4In2Bi4S13Orth. mmm(2/m2/m2/m) : Pbam

Other InformationHide

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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 CiriottiiteHide

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mindat.org URL:
https://www.mindat.org/min-46686.html
Please feel free to link to this page.

References for CiriottiiteHide

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Localities for CiriottiiteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Italy
  • Piedmont
    • Metropolitan City of Turin
      • Tavagnasco
Ciriotti et al. (2019)
Bindi et al. (2016) +1 other reference
Quick NavTopAbout CiriottiiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
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