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Ciriottiite

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About CiriottiiteHide

Marco E. Ciriotti
Formula:
Cu(Cu,Ag)3Pb19(Sb,As)22(As2)S56
Colour:
Black
Lustre:
Metallic
Crystal System:
Monoclinic
Name:
Named in honour of Marco Ernesto Ciriotti (b. 1945), Italian 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.


Classification of CiriottiiteHide

Approved
Approval Year:
2015

Physical Properties of CiriottiiteHide

Metallic
Colour:
Black
Comment:
(VHN10) is 203 kg/mm 2 (range 190–219)

Optical Data of CiriottiiteHide

Type:
Anisotropic
Anisotropism:
Distinctly with brownish to greenish rotation tints.
Reflectivity:
471.1. (31.8%. 35.3%.) 548.3. (31.0%. 34.7%) 586.6. (27.9%. 32.5%) 652.3.nmR=33.2. 37.8%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 33.2. 37.8%.
Colour in reflected light:
Light grey (in plane-polarized incident light)
Internal Reflections:
Absent

Chemical Properties of CiriottiiteHide

Formula:
Cu(Cu,Ag)3Pb19(Sb,As)22(As2)S56
IMA Formula:
Cu4Pb19(Sb,As,Bi)22(As2)S56

Crystallography of CiriottiiteHide

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:
9,779.45 ų (Calculated from Unit Cell)
Comment:
Space group P21/n.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.641(100)
3.595(35)
3.238(82)
3.208(57)
2.936(54)
2.928(37)
2.800(36)
2.043(78)
Comments:
From Type Description.

Type Occurrence of CiriottiiteHide

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

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 CiriottiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bindi, L., Biagioni, C., Martini, B. and Salvetti, A. (2015) Ciriottiite, IMA 2015- 027. CNMNC Newsletter No. 26, August 2015, page 943. Mineralogical Magazine: 79: 941-947.
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.

Internet Links for CiriottiiteHide

Localities for CiriottiiteHide

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)
 
  • Piedmont
    • Torino Province
      • Canavese District
        • Tavagnasco
          • Tavagnasco Mines (Tavagnasco Mine; Liva and Tavagnasco Mines; Tavagnasco mining district)
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 (1), 8, 13 pp.; doi:10.3390/min6010008
Mineral and/or Locality  
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