Diaphorite Mineral Data

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General Diaphorite Information

Chemical Formula:

Pb2Ag3Sb3S8

Composition:

Molecular Weight = 1,359.78 gm

Silver 23.80 % Ag

Antimony 26.86 % Sb

Lead 30.48 % Pb

Sulfur 18.87 % S

______

100.00 %

Empirical Formula:

Pb₂Ag₃Sb₃S₈

Environment:

In hydrothermal veins with other sulfides, formed at a moderate temperature.

IMA Status:

Valid Species (Pre-IMA) 1871

Locality:

Himmelsfürst Mine, Brand-Erbisdorf, Freiberg District, Erzgebirge, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

From the Greek diaphora, "difference" as being distinct from freieslebenite.

Name Pronunciation:

Diaphorite + Pronunciation

Synonym:

Brongniardite

ICSD 38568

PDF 9-126

Diaphorite Image

Images:

Diaphorite

Comments: Prismatic, striated, metallic diaphorite crystal on quartz.
Location: Morey, Nye County, Nevada, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Diaphorite Crystallography

Axial Ratios:

a:b:c =0.4937:1:0.1839

Cell Dimensions:

a = 15.84, b = 32.08, c = 5.9, Z = 8; beta = 90.165° V = 2,998.06 Den(Calc)= 6.02

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 21/a

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

By Intensity(I/I_o): 3.296(1), 2.809(0.8), 2.945(0.4),

Forms:

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Forms: ( 4 0 1) ( 0 8 1) ( 1 1 0) ( 2 0 1) ( 1 0 0)

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Crystal Structure:

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Armbruster T , Makovicky E , Berlepsch P , Sejkora J , European Journal of Mineralogy , 15 (2003) p.137-146, Crystal structure, cation ordering, and polytypic character of diaphorite,, Pb2Ag3Sb3S8, a PbS-based structure

Physical Properties of Diaphorite

Cleavage:

None

Color:

Gray, Steel gray.

Density:

6 - 6.2, Average = 6.1

Diaphaneity:

Opaque

Fracture:

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

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

steel gray

Optical Properties of Diaphorite

RL Anisotrophism:

Strong.

RL Color:

White to grayish white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Diaphorite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	41.20	44.40
420 nm	40.60	43.60
440 nm	40.00	43.00
460 nm	39.40	42.50
480 nm	38.80	42.00
500 nm	38.30	41.60
520 nm	37.80	41.10
540 nm	37.30	40.70
560 nm	36.90	40.30
580 nm	36.50	39.80
600 nm	36.20	39.50
620 nm	35.80	39.10
640 nm	35.50	38.60
660 nm	35.00	38.20
680 nm	34.50	37.60
700 nm	33.80	37.00

**Calculated Relative Intensity Colors of Diaphorite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	250%
R₁
R₂

Calculated Properties of Diaphorite

Electron Density:

Bulk Density (Electron Density)=5.19 gm/cc
note: Specific Gravity of Diaphorite =6.02 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Diaphorite= 698.49 barns/electron
U=PE_Diaphorite x rElectron Density=3,624.24 barns/cc.

Radioactivity:

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

Diaphorite Classification

Dana Class:

03.05.04.01 (03)Sulfides - Sulfosalts

(03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.05.04)Dana Group

03.05.04.01 Diaphorite Pb2Ag3Sb3S8 C 21/a 2/m

Strunz Class:

02.JB.05 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.05 Diaphorite Pb2Ag3Sb3S8 C 21/a 2/m

Other Diaphorite Information

References:

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

See Also:

Links to other databases for Diaphorite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Diaphorite

Pb2Ag3Sb3S8
Dana No: 03.05.04.01 Strunz No: 02.JB.05
Locality:

Notes: