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Baumstarkite

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About BaumstarkiteHide

07117870015416552429426.jpg
Manfred Baumstark
Formula:
Ag3Sb3S6
Minor As-for-Sb substitution possible. Formerly given as AgSbS2.
Colour:
greyish black to black
Lustre:
Metallic
Hardness:
Specific Gravity:
5.33
Crystal System:
Triclinic
Name:
For German mineralogist and mineral dealer, Manfred Baumstark (b. 1954), who discovered the mineral.
Polymorph of:
Isostructural with:
The triclinic polymorph of Miargyrite and Cuboargyrite.


Classification of BaumstarkiteHide

Approved
Approval Year:
1999
2.HA.25

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
A : With Cu, Ag, Fe (without Pb)

Physical Properties of BaumstarkiteHide

Metallic
Transparency:
Opaque
Colour:
greyish black to black
Streak:
greyish black
Hardness:
2½ on Mohs scale
Hardness:
VHN25=89.3 kg/mm2 - Vickers
Tenacity:
Sectile
Cleavage:
Perfect
on {001}, good on {100}
Density:
5.33 g/cm3 (Measured)    5.39 g/cm3 (Calculated)

Optical Data of BaumstarkiteHide

Type:
Anisotropic
Anisotropism:
Strong to weak
Reflectivity:
470nmR1=31.30%R2= 39.65%imR1= 16.60%imR2= 23.60%
546nmR1=29.20%R2= 37.30%imR1= 14.60%imR2= 21.15%
589nmR1=27.80%R2= 36.10%imR1= 13.35%imR2= 20.10%
650nmR1=26.15%R2= 33.05%imR1= 12.16%imR2= 17.60%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 39.65%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Colour in reflected light:
Grey to white
Pleochroism:
Non-pleochroic

Chemical Properties of BaumstarkiteHide

Formula:
Ag3Sb3S6

Minor As-for-Sb substitution possible. Formerly given as AgSbS2.

Crystallography of BaumstarkiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.766 Å, b = 8.322 Å, c = 8.814 Å
α = 100.62°, β = 104.03°, γ = 90.22°
Ratio:
a:b:c = 0.933 : 1 : 1.059
Unit Cell V:
542 ų
Z:
6
Morphology:
{001},{10_1},{201},{010} and {01_1} most frequent, {100} subordinate.
Twinning:
Occasionally on (001)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.425 Å(8)
3.224 Å(6)
2.841 Å(8)
2.798 Å(100)
2.013 Å(5)
1.971 Å(5)
1.3994 Å(6)

Type Occurrence of BaumstarkiteHide

General Appearance of Type Material:
Individual crystals not exceeding 3 mm, crystal aggregates up to 40x10mm coating miargyrite. Anhedral grains in miargyrite common (up to several mm)
Geological Setting of Type Material:
In high-grade silver ores of hypogene origin.
Associated Minerals at Type Locality:

Synonyms of BaumstarkiteHide

Other Language Names for BaumstarkiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
10 photos of Baumstarkite associated with MiargyriteAgSbS2
4 photos of Baumstarkite associated with PyrargyriteAg3SbS3
1 photo of Baumstarkite associated with CalciteCaCO3
1 photo of Baumstarkite associated with BaryteBaSO4
1 photo of Baumstarkite associated with QuartzSiO2

Related Minerals - Nickel-Strunz GroupingHide

2.HA.05ChalcostibiteCuSbS2Orth. mmm (2/m 2/m 2/m)
2.HA.05EmplectiteCuBiS2Orth. mmm (2/m 2/m 2/m) : Pmna
2.HA.10MiargyriteAgSbS2Mon. 2/m : B2/b
2.HA.20BerthieriteFeSb2S4Orth. mmm (2/m 2/m 2/m)
2.HA.20GaravelliteFeSbBiS4Orth.
2.HA.20CleriteMnSb2S4Orth.
2.HA.25AramayoiteAg3Sb2(Bi,Sb)S6Tric. 1 : P1

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BaumstarkiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Effenberger, H., Paar, W.H., Topa, D., Criddle, A.J., and Fleck, M. (2002) The new mineral baumstarkite and a structural reinvestigation of aramayoite and miargyrite. American Mineralogist: 87: 753-764.

Internet Links for BaumstarkiteHide

Localities for BaumstarkiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Bolivia
 
  • Potosí
    • Antonio Quijarro Province
      • Agua de Castilla
        • Porco
Kempff, O., Paar, W.H., Tawackoli, S.: "Minerales de Bolivia", 115pp (La Paz, 2009)
    • Sud Chichas Province
      • Chocaya-Animas (Animas-Chocaya)
France
 
  • Grand Est
    • Haut-Rhin
      • Colmar-Ribeauvillé
        • Ste Marie-aux-Mines
N. MEISSER 2015 analysis
            • Sankt Jakob vein
Lapis 27(11), 2002
This mine worked the same vein as Gabe gottes mine. From the 19th century, ore from a large part of the Saint-Jacques mine network was transported to level -40 of Gabe Gottes before being sent to the processing plant. The mineralization of this sector is therefore very comparable to that of Gabe-Gotes.
Italy
 
  • Lombardy
    • Lecco Province
      • Introbio
Guastoni A., Gentile P., Nestola F., Possenti I. (2016) Baumstarkite di Prapiazzo, Introbio, Valsassina (LC). Novità di mineralogia sistematica italiana. Rivista Mineralogica Italiana, 50, 2 (2-2016), 120.
Japan
 
  • Hokkaidō Prefecture
    • Ishikari Subprefecture
Kitakaze, A., Itoh, H., Komatsu, R., & Higuchi, Y. (2012) Baumstarkite from the Koryu Mine, Hokkaido, Japan. The Canadian Mineralogist, 50(1), 101-109.
Peru (TL)
 
  • Huancavelica
    • Castrovirreyna Province
      • Castrovirreyna District
        • Castrovirreyna mining district
Amer.Min.(2002) 87, 753-764; Lapis 27(11), 2002
 
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