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Cupromolybdite

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Formula:
Cu
 
3
O(MoO
 
4
)
 
2
System:OrthorhombicColour:Honey-yellow to ...
Hardness:3
Name:For the chemical composition.
Isostructural with:Vergasovaite


S-free analogue of vergasovaite.

Classification of Cupromolybdite

IMA status:Approved 2011
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Type Occurrence of Cupromolybdite

Type Locality:Yadovitaya fumarole, Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia
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:
PiypiteFedotoviteVergasovaiteHematiteMagnetite
AphthitaliteLangbeinitePalmieriteOrthoclaseLammerite
KlyuchevskiteAlumoklyuchevskiteEuchlorineLyonsitePseudolyonsite
AverieviteRutileGold

Physical Properties of Cupromolybdite

Lustre: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 (calculated):4.512 g/cm3

Crystallography of Cupromolybdite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pnma {P21/n 21/m 21/a}
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:
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%


Graph shows reflectance levels at different wavelengths (in nm). 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:
Cu
 
3
O(MoO
 
4
)
 
2
Simplified for copy/paste:Cu3O(MoO4)2
Essential elements:Cu, Mo, O
All elements listed in formula:Cu, Mo, O
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:
(Cu
 
2.83
Zn
 
0.03
Fe
 
0.01
)(Mo
 
1.98
S
 
0.05
V
 
0.02
)O
 
9

Other Names for Cupromolybdite

Synonyms:
IMA2011-005
Other Languages:

Other Information

Health Warning: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

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Localities for Cupromolybdite

    The 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. ? 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.
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