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Spiridonovite

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02365930015793167693216.jpg
Ernst M. Spiridonov
Formula:
(Cu1-xAgx)2Te (x ≈ 0.4)
Colour:
Black
Lustre:
Metallic
Hardness:
3
Specific Gravity:
4.6 (Calculated)
Crystal System:
Trigonal
Name:
Named in honour of Ernst Maksovich Spiridonov (Эрнст Максович Спиридонов) (b. 13 August 1938, Moscow, USSR), Professor at the Department of Mineralogy, Moscow State University, Russia. Prof. Spiridonov studied many gold deposits and discovered 20 new mineral species, most of them ore minerals.
Discovered in a fragment from the cameronite holotype material.


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Classification of SpiridonoviteHide

Approved
Approval Year:
2019
First Published:
2019

Physical Properties of SpiridonoviteHide

Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
Hardness:
VHN100=158 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None
Fracture:
Irregular/Uneven
Density:
4.6 g/cm3 (Calculated)

Optical Data of SpiridonoviteHide

Type:
Anisotropic
Anisotropism:
Very weak greyish to light-blue rotation tint
Bireflectance:
moderate bireflectance
Colour in reflected light:
dark bluish black
Pleochroism:
Weak
Comments:
light grey to a slightly greenish grey

Chemical Properties of SpiridonoviteHide

Formula:
(Cu1-xAgx)2Te (x ≈ 0.4)
IMA Formula:
(Cu1-xAgx)2Te, x≈0.4

Crystallography of SpiridonoviteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3c1
Cell Parameters:
a = 4.630(2) Å, c = 22.551(9) Å
Ratio:
a:c = 1 : 4.871
Unit Cell V:
418.7 ų
Z:
6

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.78Å(60)
3.76Å(20)
2.317Å(100)
2.035Å(85)
1.973Å(15)
1.635Å(30)
1.338Å(10)
1.333Å(25)

Type Occurrence of SpiridonoviteHide

General Appearance of Type Material:
Black, subhedral to anhedral grains up to 65 μm.
Place of Conservation of Type Material:
mineralogical collections of the Museo di Storia Naturale,
Università di Firenze, Via La Pira 4, I-50121, Firenze, Italy, catalogue number 3295/I
Associated Minerals at Type Locality:
Reference:
Morana, M., Bindi, L. (2019) Spiridonovite, (Cu1-xAgx)2Te (x ≈ 0.4), a new telluride from the Good Hope Mine, Vulcan, Colorado (U.S.A.). Minerals: 9: 194.

Synonyms of SpiridonoviteHide

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 SpiridonoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Morana, M., Bindi, L. (2019) Spiridonovite, (Cu1-xAgx)2Te (x ≈ 0.4), a new telluride from the Good Hope Mine, Vulcan, Colorado (U.S.A.). Minerals: 9: 194.
Bindi, L. and Morana, M. (2019) Spiridonovite, IMA 2018-136. CNMNC Newsletter
No. 48, April 2019: xxx; Mineralogical Magazine: 83: xxx-xxx; http://forum.amiminerals.it/viewtopic.php?f=5&t=15328&sid=9347e27503dcfebf35c5c8f63ca3f40c

Internet Links for SpiridonoviteHide

Localities for SpiridonoviteHide

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.
USA (TL)
 
  • Colorado
    • Gunnison Co.
      • Vulcan Mining District (Cebolla Mining District; Domingo Mining District)
        • Vulcan
Morana, M. & Bindi, L. (2019): Spiridonovite, (Cu1-xAgx)2Te (x ≈ 0.4), a new telluride from the Good Hope Mine, Vulcan, Colorado (U.S.A.). Minerals 9, 194.
 
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