Schlemaite
A valid IMA mineral species
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About Schlemaite
Formula:
(Cu,◻)6(Pb,Bi)Se4
Colour:
Black
Lustre:
Metallic
Hardness:
3
Specific Gravity:
7.54 (Calculated)
Crystal System:
Monoclinic
Name:
For the type locality, in the Schlema-Hartenstein District (Niederschlema-Alberoda mining area), Erzgebirge, Saxony, Germany.
Type Locality:
This page provides mineralogical data about Schlemaite.
Unique Identifiers
Mindat ID:
25688
Long-form identifier:
mindat:1:1:25688:1
IMA Classification of Schlemaite
Classification of Schlemaite
2.BE.25
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
E : With Pb (Bi)
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
E : With Pb (Bi)
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Slm | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Schlemaite
Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
3 on Mohs scale
Hardness:
VHN25=106 kg/mm2 - Vickers
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
7.54 g/cm3 (Calculated)
Optical Data of Schlemaite
Anisotropism:
Very weak, with rotation tints in shades of very pale metallic orange and blue
Bireflectance:
Very weak
Reflectivity:
| Wavelength | R1 (%) | R2 (%) | imR1 (%) | imR2 (%) |
|---|---|---|---|---|
| 400nm | 35.3% | 36.2% | 20.6% | 21.7% |
| 420nm | 36.1% | 37.1% | 20.9% | 22.3% |
| 440nm | 36.3% | 37.65% | 21.1% | 22.7% |
| 460nm | 36.3% | 38.0% | 21.1% | 23.0% |
| 470nm | 36.6% | 38.1% | 21.1% | 23.0% |
| 480nm | 36.6% | 38.1% | 21.05% | 23.1% |
| 500nm | 36.5% | 38.1% | 20.8% | 22.9% |
| 520nm | 36.4% | 38.1% | 20.7% | 22.8% |
| 540nm | 36.5% | 38.1% | 20.7% | 22.8% |
| 546nm | 36.45% | 38.1% | 20.7% | 22.8% |
| 560nm | 36.4% | 38.2% | 20.7% | 22.8% |
| 580nm | 36.55% | 38.2% | 20.9% | 22.9% |
| 589nm | 36.6% | 38.3% | 20.95% | 22.9% |
| 600nm | 36.7% | 38.35% | 21.0% | 23.1% |
| 620nm | 36.7% | 38.4% | 21.1% | 23.1% |
| 640nm | 36.7% | 38.5% | 21.0% | 23.2% |
| 650nm | 36.6% | 38.5% | 21.0% | 23.2% |
| 660nm | 36.6% | 38.4% | 21.1% | 23.2% |
| 680nm | 36.7% | 38.4% | 21.1% | 23.2% |
| 700nm | 36.4% | 38.5% | 21.0% | 23.4% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 38.5%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Colour in reflected light:
Grey
Internal Reflections:
None
Pleochroism:
Non-pleochroic
Chemistry of Schlemaite
Mindat Formula:
(Cu,◻)6(Pb,Bi)Se4
Element Weights:
Elements listed:
Crystallography of Schlemaite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 9.5341 Å, b = 4.1004 Å, c = 10.2546 Å
β = 100.066°
β = 100.066°
Ratio:
a:b:c = 2.325 : 1 : 2.501
Unit Cell V:
394.72 ų
Z:
2
Twinning:
None observed.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.34 Å | (80) |
| 3.17 Å | (60) |
| 2.85 Å | (80) |
| 2.69 Å | (80) |
| 2.17 Å | (60) |
| 2.10 Å | (70) |
| 2.07 Å | (100) |
| 2.04 Å | (50) |
Comments:
From type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Schlemaite
General Appearance of Type Material:
Anhedral to subhedral grains, up to a few 100 µm in size.
Place of Conservation of Type Material:
The Natural History Museum, London, England (BM 2003,4).
Mineralogical Institute, Technische Universität Bergakademie, Freiberg, Germany (80824).
Mineralogical Institute, Technische Universität Bergakademie, Freiberg, Germany (80824).
Geological Setting of Type Material:
In hydrothermal Se-bearing dolomite-ankerite veins.
Associated Minerals at Type Locality:
Synonyms of Schlemaite
Other Language Names for Schlemaite
Common Associates
Associations Based on Photo Data:
| 1 photo of Schlemaite associated with Berzelianite | Cu2-xSe (x ≈ 0.12) |
| 1 photo of Schlemaite associated with Eucairite | AgCuSe |
| 1 photo of Schlemaite associated with Clausthalite | PbSe |
| 1 photo of Schlemaite associated with 'Ankerite-Dolomite Series' |
Related Minerals - Strunz-mindat Grouping
| 2.BE. | Dulanggouite | Bi6Te3 |
| 2.BE. | Zipserite | Bi5S4 |
| 2.BE.05 | Betekhtinite | Pb2(Cu,Fe)22-24S15 |
| 2.BE.10 | Furutobeite | (Cu,Ag)6PbS4 |
| 2.BE.15 | Shandite | Ni3Pb2S2 |
| 2.BE.15 | Rhodplumsite | Rh3Pb2S2 |
| 2.BE.20 | Parkerite | Ni3(Bi,Pb)2S2 |
| 2.BE.30 | Pašavaite | Pd3Pb2Te2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Schlemaite
mindat.org URL:
https://www.mindat.org/min-25688.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Schlemaite
Reference List:
Forster, H.-J., Cooper, M. A., Roberts, A. C., Stanley, C. J., Criddle, A. J., Hawthorne, F. C., Laflamme, J.H. G., Tischendorf, G. (2003) Schlemaite, (Cu,◻)6(Pb,Bi)Se4, a new mineral species from Neiderschlema-Alberoda, Erzgebirge, Germany: description and crystal structure. The Canadian Mineralogist, 41 (6) 1433-1444 doi:10.2113/gscanmin.41.6.1433
Localities for Schlemaite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Germany | |
| Forster et al. (2004) |
| Forster et al. (2003) |
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Shaft 371, Hartenstein, Zwickau District, Saxony, Germany