Classification of Baumstarkite |
| IMA status: | Approved 1999 |
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| Strunz 8th edition ID: | 2/C.16-15
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| Nickel-Strunz 10th (pending) edition ID: | 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) |
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| mindat.org URL: | http://www.mindat.org/min-10995.html
Please feel free to link to this page. |
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Type Occurrence of Baumstarkite |
| Type Locality: | San Genaro Mine, Castrovirreyna District, Castrovirreyna Province, Huancavelica Department, Peru |
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| 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) |
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| Year of Discovery: | 1999 |
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| Geological Setting of type material: | In high-grade silver ores of hypogene origin. |
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| Associated Minerals at type locality: | |
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Physical Properties of Baumstarkite |
| Lustre: | Metallic |
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| Diaphaneity (Transparency): | Opaque |
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| Colour: | greyish black to black |
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| Streak: | greyish black |
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| Hardness (Mohs): | 2½ |
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| Hardness (Vickers): | VHN25=89.3 kg/mm2 |
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| Tenacity: | Sectile |
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| Cleavage: | Perfect
on {001}, good on {100} |
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| Density (measured): | 5.33 g/cm3 |
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| Density (calculated): | 5.39 g/cm3 |
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Crystallography of Baumstarkite |
| Crystal System: | Triclinic |
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| Class (H-M): | 1 - Pinacoidal |
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| Space Group: | P1 |
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| Cell Parameters: | a = 7.766Å, b = 8.322Å, c = 8.814Å
α = 100.62°, β = 104.03°, γ = 90.22° |
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| Ratio: | a:b:c = 0.933 : 1 : 1.059 |
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| Unit Cell Volume: | V 542 ų |
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| Z: | 6 |
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| Morphology: | {001},{10_1},{201},{010} and {01_1} most frequent, {100} subordinate. |
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| Twinning: | Occasionally on (001) |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 3.425 | | (8) | | 3.224 | | (6) | | 2.841 | | (8) | | 2.798 | | (100) | | 2.013 | | (5) | | 1.971 | | (5) | | 1.3994 | | (6) |
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Optical Data of Baumstarkite |
| Type: | Anisotropic |
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| Anisotropism: | Strong to weak |
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| Reflectivity: | | 470nm | R1=31.30% | R2= 39.65% | imR1= 16.60% | imR2= 23.60% | | 546nm | R1=29.20% | R2= 37.30% | imR1= 14.60% | imR2= 21.15% | | 589nm | R1=27.80% | R2= 36.10% | imR1= 13.35% | imR2= 20.10% | | 650nm | R1=26.15% | R2= 33.05% | imR1= 12.16% | imR2= 17.60% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 39.65%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue |
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| Colour in reflected light: | Grey to white |
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| Pleochroism: | Non-pleochroic |
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Chemical Properties of Baumstarkite |
| Formula: | |
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| Essential elements: | Ag, S, Sb |
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| All elements listed in formula: | Ag, S, Sb |
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| Analytical Data: | Means of 22 sets of electron microprobe data
Cu (0.10)
Ag (36.3)
Sb (40.2)
As (0.7)
S (22.0)
Total: 99.3 wt.% |
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| Empirical Formula: | |
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Relationship of Baumstarkite to other Species |
Related Minerals - Nickel-Strunz Grouping):
- + | |
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Other Names for Baumstarkite |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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References for Baumstarkite |
Reference List:
- + | 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.
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Internet Links for Baumstarkite |
| Search Engines: |
Look for Baumstarkite on Google
Look for Baumstarkite images on Google |
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| External Links: | Look for Baumstarkite on WebmineralLook for Baumstarkite on Athena MineralogyLook for Baumstarkite on Mineralien AtlasRaman and XRD data at RRUFF project[Link Broken?]American Mineralogist Crystal Structure Database[Link Broken?]Baumstarkite details from Handbook of Mineralogy (PDF)[Link Broken?] |
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| Mineral Dealers: | Fine Minerals from Weinrich Minerals, Inc.High-end worldwide specimens & outstanding customer serviceMineral Classics - Worldwide Collector Quality Minerals and GemsEdwards Minerals - Fine SpecimensSearch for Baumstarkite from all mineral dealers at minfind.comSearch for - Baumstarkite - on e-Rocks Mineral Sales & AuctionsTop quality minerals from Kristalle of CaliforniawebmineralsBuy from David K Joyce mineralsPricedownminerals.com - Reverse Auctions and ShopBy minerals from YourMineralCollectionFind Baumstarkite on www.crystalclassics.co.uk |
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| Jobs: | Mining & Geology Jobs |
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Localities for Baumstarkite |
The 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.
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Mineral and Locality Search
