Vergasovaite Mineral Data

Vergasovaite Mineral Data

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General Vergasovaite Information

Chemical Formula:

Cu3O[(Mo,S)O4][SO4]

Composition:

Molecular Weight = 443.69 gm

Zinc 1.47 % Zn 1.83 % ZnO

Copper 40.10 % Cu 50.20 % CuO

Molybdenum 17.30 % Mo 25.95 % MoO₃

Sulfur 8.67 % S 21.65 % SO₃

Oxygen 32.45 % O

______ ______

100.00 % 99.64 % = TOTAL OXIDE

Empirical Formula:

Cu_2.8Zn_0.1O(MoO₄)_0.8(SO₄)_1.2

Environment:

Found in a fumarole.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

North Breach of the Main Tolbachik fissure eruption, Kamchatka Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after Lidiya Pavlovna Vergasova (b. 1941), of the Institute of Volcanology, Russian Academy of Sciences, Petropavlovsk, Russia,

Synonym:

IMA1998-009

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Vergasovaite Crystallography

Axial Ratios:

a:b:c =1.1007:1:2.0097

Cell Dimensions:

a = 7.42, b = 6.741, c = 13.548, Z = 4; V = 677.65 Den(Calc)= 4.35

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.077(1)(104), 3.591(0.6)(020), 2.275(0.6)(124),2.5(0.6)(220), 2.542(0.6)(105,123), 3.342(0.6)(113), 3.391(0.6),

Crystal Structure:

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Berlepsch P , Armbruster T , Brugger J , Bykova E Y , Kartashov P M , European Journal of Mineralogy , 11 (1999) p.101-110, The crystal structure of vergasovaite Cu3O[(Mo,S)O4SO4],, and its relation to synthetic Cu3O[MoO4]2

Physical Properties of Vergasovaite

Cleavage:

None

Color:

Olive green.

Diaphaniety:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Vergasovaite

Gladstone-Dale:

CI calc= -0.131 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2126,KC= 0.1881

Optical Data:

Biaxial (?), a=1.87, g=1.98, bire=0.1100

RL Color:

Gray with light green to colorless internal reflections.

Calculated Properties of Vergasovaite

Electron Density:

r_electron=4.10 gm/cc
note: r_Vergasovaite=4.35 gm/cc.

Fermion Index

Fermion Index = 0.04546
Boson Index = 0.95454

Photoelectric:

PE_Vergasovaite= 47.30 barns/electron
U=PE_Vergasovaite x r_electron= 193.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vergasovaite is Not Radioactive

Vergasovaite Classification

Dana Class:

48.4.3.1 (48)Anhydrous Molybdates and Tungstates

(48.4)with miscellaneous formulae

(48.4.3)Dana Group

48.4.3.1 Vergasovaite ! Cu3O[(Mo,S)O4][SO4] P nma 2/m 2/m 2/m

48.4.3.2 Schlegelite! Bi7O4(MoO4)2(AsO4)3 Pnca 2/m 2/m 2/m

Strunz Class:

VI/G.02-25 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/G - Molybdates [MoO4]2- and wolframates [WO4]2-

VI/G.02 - Lindgrenite - Phyllotungstite series

VI/G.02-05 Biehlite! (Sb,As)2MoO6 C 2/c 2/m

VI/G.02-10 Lindgrenite Cu3(MoO4)2(OH)2 P 2₁/n 2/m

VI/G.02-15 Szenicsite Cu3MoO4(OH)4 Pnnm, Pnn2 Ortho

VI/G.02-20 Cuprotungstite Cu3(WO4)2(OH)2 Unk Tetra

VI/G.02-25 Vergasovaite Cu3O[(Mo,S)O4][SO4] P nma 2/m 2/m 2/m

VI/G.02-30 Ferrimolybdite Fe2(MoO4)3·8(H2O) Unk Ortho

VI/G.02-40 Phyllotungstite CaFe3H(WO4)6·10(H2O) P 222,Pmm2,P mmm Ortho

Other Vergasovaite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(AmMin, V85, p264) OPTIC PROP.(AmMin, V85, p264)

See Also:

Links to other databases for Vergasovaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Vergasovaite

Cu3O[(Mo,S)O4][SO4]
Dana No: 48.4.3.1 Strunz No: VI/G.02-25
Locality:

Notes: