Mummeite
A valid IMA mineral species
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About Mummeite
Formula:
Cu0.58Ag3.11Pb1.10Bi6.65S13
Also given as (Cu,Ag)3-4(Bi,Pb)7-8S13
Colour:
Gray
Lustre:
Metallic
Hardness:
4
Specific Gravity:
6.795 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named for the mineralogist and crystallographer William Gustav (Gus) Mumme (CSIRO, Melbourne, Australia) who first studied the mineral and who worked on sulfosalts.
This page provides mineralogical data about Mummeite.
Unique Identifiers
Mindat ID:
2807
Long-form identifier:
mindat:1:1:2807:9
IMA Classification of Mummeite
Approved
IMA Formula:
Cu0.58Ag3.11Pb1.10Bi6.65S13
First published:
1992
Classification of Mummeite
2.JA.05f
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
A : Galena derivatives with little or no Pb
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
A : Galena derivatives with little or no Pb
3.8.10.4
3 : SULFOSALTS
8 : 1 < ø < 2
3 : SULFOSALTS
8 : 1 < ø < 2
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 |
|---|---|---|
| Mum | 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 Mummeite
Optical Data of Mummeite
Anisotropism:
Pronounced, gray to brownish yellow to dark indigo
Bireflectance:
Perceptible
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 470nm | 43.3% | 47.5% |
| 546nm | 42.8% | 47.0% |
| 589nm | 42.5% | 46.4% |
| 650nm | 42.2% | 45.7% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 47.5%.
R1 shown in black, R2 shown in red
Chemistry of Mummeite
Mindat Formula:
Cu0.58Ag3.11Pb1.10Bi6.65S13
Also given as (Cu,Ag)3-4(Bi,Pb)7-8S13
Also given as (Cu,Ag)3-4(Bi,Pb)7-8S13
Element Weights:
Crystallography of Mummeite
Crystal System:
Monoclinic
Cell Parameters:
a = 13.47(1) Å, b = 4.06(1) Å, c = 21.63(1) Å
β = 92.9(1)°
β = 92.9(1)°
Ratio:
a:b:c = 3.318 : 1 : 5.328
Unit Cell V:
1,181.39 ų (Calculated from Unit Cell)
Morphology:
Massive, granular, lath-like.
Twinning:
Along a composition plane parallel to elongation.
Comment:
Suggested space groups: C2/m or Cm (Karup-Møller & Makovicky, 1992). "Cuproplumbian mummeite" has a = 13.48(1), b = 4.06(1), c = 21.72(1) A, β = 93.9(1)° (Karup-Møller & Makovicky, 1992). A sample from the Mike mine has: a = 13.41, b = 4.05, c = 21.51 Å, β = 94.5° (Mumme, 1990). Synthetic Ag3.5Bi7.5S13 has space group C2/m, a = 13.3237(2), b = 4.0455(4), c = 21.484(3) Å, β = 92.90 (1)° (Poudeu Poudeu and Ruck, 2005).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.863 Å | (100) |
| 2.023 Å | (100) |
| 3.53 Å | (50) |
| 3.43 Å | (50) |
| 1.652 Å | (40) |
| 1.285 Å | (40) |
| 5.55 Å | (30) |
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 Mummeite
General Appearance of Type Material:
Intergrowths of short columnar crystals to 1 mm.
Place of Conservation of Type Material:
University of Copenhagen, Copenhagen, Denmark.
Museum of Natural History, Denver, Colorado, USA.
Museum of Natural History, Denver, Colorado, USA.
Associated Minerals at Type Locality:
Synonyms of Mummeite
Other Language Names for Mummeite
Relationship of Mummeite to other Species
Member of:
Other Members of Pavonite Homologous Series:
| Benjaminite | Ag3Bi7S12 | Mon. 2/m : B2/m |
| Cupromakopavonite | Ag3Cu8Pb4Bi19S38 | Mon. 2/m : B2/m |
| Cupromakovickyite | Cu4AgPb2Bi9S18 | Mon. 2/m : B2/m |
| Cupropavonite | Cu0.9Ag0.5Pb0.6Bi2.5S5 | Mon. 2/m : B2/m |
| Dantopaite | Ag5Bi13S22 | Mon. 2/m : B2/m |
| Graţianite | MnBi2S4 | Mon. 2/m : B2/m |
| Grumiplucite | HgBi2S4 | Mon. 2/m : B2/m |
| Kudriavite | (Cd,Pb)Bi2S4 | Mon. 2/m : B2/m |
| Luboržákite | Mn2AsSbS5 | Mon. 2/m : B2/m |
| Makovickyite | Cu1.12Ag0.81Pb0.27Bi5.35S9 | Mon. 2/m |
| Pavonite | AgBi3S5 | Mon. 2/m : B2/m |
| Sunshuite | The Fe analogue of graţianite. | Mon. 2/m : B2/m |
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Mummeite associated with Aikinite | PbCuBiS3 |
| 1 photo of Mummeite associated with Chalcopyrite | CuFeS2 |
Related Minerals - Strunz-mindat Grouping
| 2.JA. | Ferdowsiite | Ag8(Sb5As3)S16 |
| 2.JA. | Luboržákite | Mn2AsSbS5 |
| 2.JA. | Sangenaroite | Ag8(Sb8-xAsx)SΣ16 |
| 2.JA.05a | Pavonite | AgBi3S5 |
| 2.JA.05b | Grumiplucite | HgBi2S4 |
| 2.JA.05c | Kudriavite | (Cd,Pb)Bi2S4 |
| 2.JA.05d | Cupromakovickyite | Cu4AgPb2Bi9S18 |
| 2.JA.05e | Benjaminite | Ag3Bi7S12 |
| 2.JA.05i | Livingstonite | HgSb4S6(S2) |
| 2.JA.05h | Mozgovaite | PbBi4S7 |
| 2.JA.05 | Dantopaite | Ag5Bi13S22 |
| 2.JA.05a | Cupropavonite | Cu0.9Ag0.5Pb0.6Bi2.5S5 |
| 2.JA.05 | Selenodantopaite | Ag5Bi13Se22 |
| 2.JA.05g | Borodaevite | Ag5(Bi,Pb,Fe)8(Sb,Bi)2S17 |
| 2.JA.05a | Cupromakopavonite | Ag3Cu8Pb4Bi19S38 |
| 2.JA.05d | Makovickyite | Cu1.12Ag0.81Pb0.27Bi5.35S9 |
| 2.JA.10b | Kupčíkite | Cu3.4Fe0.6Bi5S10 |
| 2.JA.10d | Pizgrischite | (Cu,Fe)Cu14PbBi17S35 |
| 2.JA.10c | Hodrušite | Cu8Bi12S22 |
| 2.JA.10a | Cuprobismutite | Cu8AgBi13S24 |
| 2.JA.10e | Padĕraite | Cu7[(Cu,Ag)0.33Pb1.33Bi11.33]S22 |
| 2.JA.15 | Schapbachite | Ag0.4Pb0.2Bi0.4S |
| 2.JA.15 | Cuboargyrite | AgSbS2 |
| 2.JA.20 | Matildite | AgBiS2 |
| 2.JA.20 | Volynskite | AgBiTe2 |
| 2.JA.20 | Bohdanowiczite | AgBiSe2 |
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 Mummeite
mindat.org URL:
https://www.mindat.org/min-2807.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
References for Mummeite
Reference List:
Localities for Mummeite
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.
Brazil | |
| Silva (2017) |
Greece | |
| Voudouris et al. (2008) |
| Voudouris et al. (2003) +1 other reference | |
Norway | |
| Larsen et al. (2018) |
| Larsen et al. (2018) |
Russia | |
| Rogov et al. (2023) |
| Rogov et al. (2023) | |
| Simanenko (2007) |
Slovakia | |
| Ďuďa R. et al. (1993) |
| Jeleň et al. (2012) |
| In the collection of Brent Thorne. ... |
Ukraine | |
| Biruk et al. (2012) |
USA | |
| Mumme (1990) +3 other references |
| Dana 7:I:446 +2 other references |
| Eckel et al. (1997) |
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Acapulco adit, Alaska Mine, Poughkeepsie Gulch, San Juan County, Colorado, USA