Roshchinite Mineral Data

Roshchinite Mineral Data +

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General Roshchinite Information

Chemical Formula:

Ag19Pb10Sb51S96 or Pb(Ag,Cu)2(Sb,As)5S10

Composition:

Molecular Weight = 12887.63 gm

Copper 0.99 % Cu

Silver 15.90 % Ag

Antimony 43.46 % Sb

Arsenic 2.91 % As

Lead 12.86 % Pb

Sulfur 23.89 % S

______

100.00 %

Empirical Formula:

Ag₁₉Pb₈Cu₂Sb₄₆As₅S₉₆

IMA Status:

Approved IMA 1990

Locality:

Kvartsitovyye Gorki deposit, Kasakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for Yuri V. Roshchin (1934-1979), Russian Geologist.

Synonym:

IMA1989-006

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Roshchinite Crystallography

Axial Ratios:

a:b:c =0.6796:1:0.8889

Cell Dimensions:

a = 12.946, b = 19.048, c = 16.932, Z = 1; V = 4,175.35 Den(Calc)= 5.13

Crystal System:

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

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

By Intensity(I/I_o): 1.765(1), 2.85(0.8), 3.24(0.6),

Physical Properties of Roshchinite

Cleavage:

None

Color:

Lead gray, Silver gray.

Density:

5.27

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2.5-3.5 - Finger Nail-Copper Penny

Luster:

Metallic

Streak:

pale steel gray

Optical Properties of Roshchinite

RL Anisotrophism:

Distinct.

Calculated Properties of Roshchinite

Electron Density:

r_electron=4.50 gm/cc
note: r_Roshchinite=5.13 gm/cc.

Fermion Index

Fermion Index = 0.03021
Boson Index = 0.96979

Photoelectric:

PE_Roshchinite= 416.00 barns/electron
U=PE_Roshchinite x r_electron=1,872.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Roshchinite is Not Radioactive

Roshchinite Classification

Dana Class:

3.4.15.7 (3)Sulfides - Sulfosalts

(3.4)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.4.15)Lillianite Group (Orthorhombic, AmBnS6 where A=Pb, Ag, Mn and B=Sb, Bi)

3.4.15.1 Lillianite Pb3Bi2S6 Bbmm 2/m 2/m 2/m

3.4.15.2 Bursaite Pb5Bi4S11 Bbmm 2/m 2/m 2/m

3.4.15.3 Gustavite PbAgBi3S6(?) Bbmm 2/m 2/m 2/m

3.4.15.4 Andorite PbAgSb3S6 Pmma 2/m 2/m 2/m

3.4.15.5 Uchucchacuaite AgPb3MnSb5S12 P mmm 2/m 2/m 2/m

3.4.15.6 Ramdohrite Ag3Pb6Sb11S24 P 2/n 2/m

3.4.15.7 Roshchinite Ag19Pb10Sb51S96orPb(Ag,Cu)2(Sb,As)5S10 Pmna 2/m 2/m 2/m

3.4.15.8 Fizelyite Pb14Ag5Sb21S48(?) P 2₁/n 2/m

Strunz Class:

II/E.23-50 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Complex Lead-Sulfosalts (Pb-Fe/Mn, Pb-Ag), with predominant Antimon x = 2.3 - 2.0

II/E.23 - Uchucchacuaite - Roshchinite series

II/E.23-10 Uchucchacuaite AgPb3MnSb5S12 P mmm 2/m 2/m 2/m

II/E.23-20 Fizelyite Pb14Ag5Sb21S48(?) P 2₁/n 2/m

II/E.23-30 Ramdohrite Ag3Pb6Sb11S24 P 2/n 2/m

II/E.23-40 Andorite PbAgSb3S6 Pmma 2/m 2/m 2/m

II/E.23-50 Roshchinite Ag19Pb10Sb51S96orPb(Ag,Cu)2(Sb,As)5S10 Pmna 2/m 2/m 2/m

Other Roshchinite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.77,p450,1992) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Roshchinite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Roshchinite

Ag19Pb10Sb51S96 or Pb(Ag,Cu)2(Sb,As)5S10
Dana No: 3.4.15.7 Strunz No: II/E.23-50
Locality:

Notes: