Ramdohrite Mineral Data

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.

Name Pronunciation:

Ramdohrite + Pronunciation

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),

Crystal Structure:

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Makovicky E , Mumme W G , Neues Jahrbuch fur Mineralogie, Abhandlungen , 147 (1983) p.58-79, The crystal structure of ramdohrite, Pb6Sb11Ag3S24, and its implications for, the andorite group and zinckenite, Locality: Chocaya Mine, Potosi, Bolivia, Note: changed S12(z) to match reported bond distances

Physical Properties of Ramdohrite

Color:

Bluish black gray.

Density:

5.33

Diaphaneity:

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:

Bulk Density (Electron Density)=4.77 gm/cc
note: Specific Gravity of Ramdohrite =5.56 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ramdohrite is Not Radioactive

Ramdohrite Classification

Dana Class:

03.04.15.06 (03)Sulfides - Sulfosalts

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

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

03.04.15.01 Lillianite Pb3Bi2S6 Bbmm 2/m 2/m 2/m

03.04.15.02 Bursaite? Pb5Bi4S11 Bbmm 2/m 2/m 2/m

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

03.04.15.04 Andorite PbAgSb3S6 Pmma 2/m 2/m 2/m

03.04.15.05 Uchucchacuaite AgPb3MnSb5S12 P mmm 2/m 2/m 2/m

03.04.15.06 Ramdohrite Ag3Pb6Sb11S24 P 2/n 2/m

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

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

Strunz Class:

02.JB.40a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.J - Sulfosalts of PbS Archetype

02.JB -Galena derivatives, with Pb

02.JB.40a Fizelyite Pb14Ag5Sb21S48(?) P 2₁/n 2/m

02.JB.40a Andorite PbAgSb3S6 Pmma 2/m 2/m 2/m

02.JB.40a Bursaite? Pb5Bi4S11 Bbmm 2/m 2/m 2/m

02.JB.40a Gustavite PbAgBi3S6(?) Bbmm 2/m 2/m 2/m

02.JB.40a Lillianite Pb3Bi2S6 Bbmm 2/m 2/m 2/m

02.JB.40a Roshchinite Ag19Pb10Sb51S96orPb(Ag,Cu)2(Sb,As)5S10 Pmna 2/m 2/m 2/m

02.JB.40a Uchucchacuaite AgPb3MnSb5S12 P mmm 2/m 2/m 2/m

02.JB.40a Ramdohrite Ag3Pb6Sb11S24 P 2/n 2/m

02.JB.40a Xilingolite Pb3Bi2S6 C 2/m 2/m

02.JB.40a Treasurite Ag7Pb6Bi15S32 B2/m 2/m

02.JB.40a Vikingite Ag5Pb8Bi13S30 C 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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

Ramdohrite

Ag3Pb6Sb11S24
Dana No: 03.04.15.06 Strunz No: 02.JB.40a
Locality:

Notes: