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Cupromolybdite

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Formula:
Cu3O(MoO4)2
Colour:
Honey-yellow to chestnut-brown or dark brown; bright yellow
Lustre:
Adamantine
Hardness:
3
Specific Gravity:
4.512 (Calculated)
Crystal System:
Orthorhombic
Name:
For the chemical composition.
Isostructural with:
S-free analogue of vergasovaite.


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Classification of CupromolybditeHide

Approved
Approval Year:
2011

Physical Properties of CupromolybditeHide

Adamantine
Transparency:
Translucent
Colour:
Honey-yellow to chestnut-brown or dark brown; bright yellow
Streak:
Yellow or light brown
Hardness:
Hardness:
VHN50=189 kg/mm2 - Vickers
Comment:
Mohs hardness derived from VHN.
Tenacity:
Brittle
Cleavage:
Distinct/Good
Fracture:
Irregular/Uneven, Splintery
Density:
4.512 g/cm3 (Calculated)

Optical Data of CupromolybditeHide

Type:
Anisotropic
Anisotropism:
Distinct
Bireflectance:
Weak
Reflectivity:
400nmR1=17.0%R2= 18.5%
420nmR1=16.3%R2= 17.7%
440nmR1=15.7%R2= 17.1%
460nmR1=15.2%R2= 16.5%
480nmR1=14.7%R2= 16.1%
500nmR1=14.3%R2= 15.7%
520nmR1=13.9%R2= 15.3%
540nmR1=13.5%R2= 15.0%
560nmR1=13.1%R2= 14.6%
580nmR1=12.9%R2= 14.3%
600nmR1=12.4%R2= 13.8%
620nmR1=12.2%R2= 13.6%
640nmR1=12.15%R2= 13.5%
660nmR1=11.9%R2= 13.2%
680nmR1=17.0%R2= 18.5%
700nmR1=16.3%R2= 17.7%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 18.5%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Grey, with a weak bluish hue
Internal Reflections:
Orange-red or orange-brown
Pleochroism:
Non-pleochroic

Chemical Properties of CupromolybditeHide

Formula:
Cu3O(MoO4)2
IMA Formula:
Cu2+3O(Mo6+O4)2

Crystallography of CupromolybditeHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 7.6638(1) Å, b = 6.8670(1) Å, c = 14.5554(2) Å
Ratio:
a:b:c = 1.116 : 1 : 2.12
Unit Cell V:
766.01 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.312 (67)
3.842 (37)
3.701 (38)
3.664 (30)
3.518 (55)
3.436 (100)
3.301 (99)
3.065 (79)
2.556 (62)
2.506 (66)

Type Occurrence of CupromolybditeHide

General Appearance of Type Material:
Prismatic or acicular crystals up to 0.15 mm in length; radiating aggregates.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia: registration number is 4072/1.
Geological Setting of Type Material:
Within 2-5 cm thick sublimate crusts, along with other fumarolic minerals.
Associated Minerals at Type Locality:

Synonyms of CupromolybditeHide

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 CupromolybditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Zelenski, M.E., Zubkova, N.V., Pekov, I.V., Polekhovsky, Yu.S. & Pushcharovsky, D.Yu. (2012): Cupromolybdite, Cu3O(MoO4)2, a new fumarolic mineral from the Tolbachik volcano, Kamchatka Peninsula, Russia. European Journal of Mineralogy, 24, 749-757.

Internet Links for CupromolybditeHide

Localities for CupromolybditeHide

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.
Russia (TL)
 
  • Far-Eastern Region
    • Kamchatka Oblast'
      • Tolbachik volcano
        • Great Fissure eruption (Main Fracture)
          • Northern Breakthrough (North Breach)
            • Second scoria cone
Zelenski, M.E., Zubkova, N.V., Pekov, I.V., Polekhovsky, Yu.S. & Pushcharovsky, D.Yu. (2012): Cupromolybdite, Cu3O(MoO4)2, a new fumarolic mineral from the Tolbachik volcano, Kamchatka Peninsula, Russia. European Journal of Mineralogy, 24, 749-757.
Mineral and/or Locality  
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