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Cupromolybdite

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Formula:
Cu3O(MoO4)2
System:
Orthorhombic
Colour:
Honey-yellow to ...
Hardness:
3
Name:
For the chemical composition.
Isostructural with:
S-free analogue of vergasovaite.

Classification of Cupromolybdite

Approved 2011
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First Recorded Occurrence of Cupromolybdite

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

Physical Properties of Cupromolybdite

Adamantine
Diaphaneity (Transparency):
Translucent
Colour:
Honey-yellow to chestnut-brown or dark brown; bright yellow
Streak:
Yellow or light brown
Hardness (Mohs):
3
Hardness (Vickers):
VHN50=189 kg/mm2
Comment:
Mohs hardness derived from VHN.
Tenacity:
Brittle
Cleavage:
Distinct/Good
Fracture:
Irregular/Uneven, Splintery
Density:
4.512 g/cm3 (Calculated)

Crystallography of Cupromolybdite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Space Group 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 Volume:
V 766.01 ų
Z:
4
X-Ray 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)

Optical Data of Cupromolybdite

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 Cupromolybdite

Formula:
Cu3O(MoO4)2
Essential elements:
All elements listed in formula:
Analytical Data:
Average of 7 electron-microprobe analyses; prismatic variety of type material.
CuO (43.03)
FeO (0.08)
ZnO (0.53)
MoO3 (54.48)
SO3 (0.71)
V2O5 (0.28)
SiO2 (0.04)
Total (99.15)
Empirical Formula:
(Cu2.83Zn0.03Fe0.01)(Mo1.98S0.05V0.02)O9

Other Names for Cupromolybdite

Name in Other Languages:

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.

References for Cupromolybdite

Reference List:
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 Cupromolybdite

Localities for Cupromolybdite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Russia
 
  • 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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