Ramdohrite Mineral Data

Ramdohrite Mineral Data +

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General Ramdohrite Information

Chemical Formula:

Ag3Pb6Sb11S24

Composition:

Molecular Weight = 3,675.64 gm

Silver 8.80 % Ag

Antimony 36.44 % Sb

Lead 33.82 % Pb

Sulfur 20.94 % S

______

100.00 %

Empirical Formula:

Ag₃Pb₆Sb₁₁S₂₄

Environment:

Found in fine-grained quartz in a vein of hydrothermal origin.

IMA Status:

Valid Species (Pre-IMA) 1930

Locality:

Chocaya la vieja, in Potosi, Bolovia. Link to MinDat.org Location Data.

Name Origin:

Named for Paul Ramdohr (1890-1985), German mineralogist.

Synonym:

ICSD 31237

PDF 42-1415

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Ramdohrite Crystallography

Axial Ratios:

a:b:c =1.4709:1:0.6674

Cell Dimensions:

a = 19.24, b = 13.08, c = 8.73, Z = 2; beta = 90.28° V = 2,196.96 Den(Calc)= 5.56

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/n

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

By Intensity(I/I_o): 3.33(1), 2.91(0.6), 3.45(0.4),

Physical Properties of Ramdohrite

Color:

Bluish black gray.

Density:

5.33

Diaphaniety:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

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

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2 - Gypsum

Luster:

Metallic

Streak:

gray black

Optical Properties of Ramdohrite

Optical Data:

NCalc= 1.36 - from Gladstone-Dale relationship (KC = 0.0643) where Ncalc=Dcalc*KC+1
NCalc= 1.34 - from Gladstone-Dale relationship (KC = 0.0643) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Moderate.

RL Color:

White.

RL Pleochroism:

Very weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Ramdohrite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	39.30	43.10
420 nm	38.80	42.80
440 nm	38.30	42.50
460 nm	37.80	42.20
480 nm	37.40	42.00
500 nm	36.90	41.60
520 nm	36.50	41.20
540 nm	36.00	40.90
560 nm	35.70	40.50
580 nm	35.30	40.20
600 nm	34.80	39.70
620 nm	34.40	39.20
640 nm	34.00	38.70
660 nm	33.40	38.00
680 nm	32.80	37.30
700 nm	32.00	36.40

**Calculated Relative Intensity Colors of Ramdohrite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	260%
R₁
R₂

Calculated Properties of Ramdohrite

Electron Density:

r_electron=4.77 gm/cc
note: r_Ramdohrite=5.56 gm/cc.

Fermion Index

Fermion Index = 0.07631
Boson Index = 0.92369

Photoelectric:

PE_Ramdohrite= 754.12 barns/electron
U=PE_Ramdohrite x r_electron=3,600.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ramdohrite is Not Radioactive

Ramdohrite Classification

Dana Class:

3.4.15.6 (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.23-30 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 Ramdohrite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

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

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Print or Cut-and-Paste your Ramdohrite Specimen Label here :

Ramdohrite

Ag3Pb6Sb11S24
Dana No: 3.4.15.6 Strunz No: II/E.23-30
Locality:

Notes: