Aschamalmite Mineral Data

General Aschamalmite Information

Chemical Formula:

Pb6Bi2S9

Composition:

Molecular Weight = 1,949.75 gm

Bismuth 21.44 % Bi

Lead 63.76 % Pb

Sulfur 14.80 % S

______

100.00 %

Empirical Formula:

Pb₆Bi₂S₉

Environment:

In alpine cleft veins, cutting gneiss.

IMA Status:

Approved IMA 1983

Locality:

Ascham Alm, Untersulzbachtal, Austria. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Aschamalmite + Pronunciation

Synonym:

Beegerite

Aschamalmite Image

Images:

Aschamalmite

Comments: Black metallic blades of aschamalmite associated with beige rhombic siderite.
Location: Costabella, Osiglia, SV, Italy. Scale: Crystal Size: 1 mm.
© Carlo Guidarin

Images:

Aschamalmite

Comments: Lead gray metallic prismatic aschamalmite crystals in veins in quartz.
Location: Ascham Alp, Untersulzbach Valley, Salzburg, Austria. Scale: See Image.
© Rruff Database

Aschamalmite Crystallography

Axial Ratios:

a:b:c =3.352:1:7.6845

Cell Dimensions:

a = 13.71, b = 4.09, c = 31.43, Z = 4; beta = 91° V = 1,762.13 Den(Calc)= 7.35

Crystal System:

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

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

By Intensity(I/I_o): 3.426(1), 3.378(0.88), 2.941(0.54),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
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Callegari A M , Boiocchi M , Mineralogical Magazine , 73 (2009) p.83-94, Aschamalmite (Pb6Bi2S9): crystal structure and ordering scheme for Pb and Bi atoms, Locality: Susa Valley, Piedmont, Italy

Physical Properties of Aschamalmite

Cleavage:

{001} Perfect

Color:

Lead gray, Gray.

Density:

7.27

Diaphaneity:

Opaque

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

3.5 - Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Optical Properties of Aschamalmite

RL Anisotrophism:

Moderate, from gray to red-brown.

RL Color:

Creamy white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Aschamalmite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	48.80	44.10
420 nm	48.20	43.50
440 nm	47.50	43.00
460 nm	46.70	42.50
480 nm	46.40	42.10
500 nm	45.80	41.70
520 nm	44.80	41.10
540 nm	44.30	40.50
546 nm	44.00	40.10
560 nm	43.90	40.00
580 nm	43.80	39.70
589 nm	43.50	39.40
600 nm	43.50	39.30
620 nm	43.30	39.00
640 nm	43.20	38.80
650 nm	43.10	38.70
660 nm	43.00	38.70
680 nm	42.90	38.70
700 nm	42.90	38.40

**Calculated Relative Intensity Colors of Aschamalmite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	230%
R₁
R₂

Calculated Properties of Aschamalmite

Electron Density:

Bulk Density (Electron Density)=6.05 gm/cc
note: Specific Gravity of Aschamalmite =7.35 gm/cc.

Fermion Index:

Fermion Index = 0.14
Boson Index = 0.86

Photoelectric:

PE_Aschamalmite=1,610.06 barns/electron
U=PE_Aschamalmite x rElectron Density=9,735.42 barns/cc.

Radioactivity:

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

Aschamalmite Classification

Dana Class:

03.01.11.01 (03)Sulfides - Sulfosalts

(03.01)where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.01.11)Dana Group

03.01.11.01 Aschamalmite Pb6Bi2S9 C 2/m 2/m

Strunz Class:

02.JB.40b 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.40b Aschamalmite Pb6Bi2S9 C 2/m 2/m

02.JB.40b Eskimoite Ag7Pb10Bi15S36 Am m

02.JB.40b Heyrovskyite Pb10AgBi5S18 C mcm 2/m 2/m 2/m

Other Aschamalmite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(CanMin, v 41, p 431)

See Also:

Links to other databases for Aschamalmite :
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 Aschamalmite Specimen Label here :

Aschamalmite

Pb6Bi2S9
Dana No: 03.01.11.01 Strunz No: 02.JB.40b
Locality:

Notes: