Abswurmbachite
A valid IMA mineral species
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Formula:
CuMn3+6(SiO4)O8
Colour:
Black
Lustre:
Metallic
Hardness:
6½
Specific Gravity:
4.96 (Calculated)
Crystal System:
Tetragonal
Member of:
Name:
Named in honor of Dr. Irmgard Abs-Wurmbach (19 December 1938 - 8 April 2020), Institut für Mineralogie, Ruhr Universität, Bochum, Germany, in recognition of her research on braunite.
Forms a series with braunite. The third approved Cu-Mn silicate mineral, as such somewhat similar to dixenite and stavelotite-(La).
Unique Identifiers
IMA Classification of Abswurmbachite
Approved
IMA Formula:
Cu2+Mn3+6O8(SiO4)
Approval year:
1990
First published:
1991
Classification of Abswurmbachite
9.AG.05
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
7.5.1.4
7 : MULTIPLE OXIDES
5 : (AB)2X3
7 : MULTIPLE OXIDES
5 : (AB)2X3
14.18.6
14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe
14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe
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 |
---|---|---|
Abs | 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 Abswurmbachite
Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Brownish black
Hardness:
6½ on Mohs scale
Hardness:
VHN25=870 - 950 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Density:
4.96 g/cm3 (Calculated)
Optical Data of Abswurmbachite
Anisotropism:
Weak
Reflectivity:
Wavelength | R1 | R2 | imR1 | imR2 |
---|---|---|---|---|
470nm | 20.8% | 21.2% | 7.54% | 7.88% |
546nm | 19.6% | 20.0% | 6.87% | 7.16% |
589nm | 19.2% | 19.7% | 6.56% | 6.92% |
650nm | 18.7% | 19.2% | 6.24% | 6.58% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 21.2%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Colour in reflected light:
Gray
Internal Reflections:
None
Pleochroism:
Non-pleochroic
Chemistry of Abswurmbachite
Mindat Formula:
CuMn3+6(SiO4)O8
Elements listed:
Common Impurities:
Fe,(Al,Ti,Cu,Mg,Ca)
Crystallography of Abswurmbachite
Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I41/acd
Cell Parameters:
a = 9.406 Å, c = 18.546 Å
Ratio:
a:c = 1 : 1.972
Unit Cell V:
1640.82 ų
Z:
8
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014719 | Abswurmbachite | Reinecke T, Tillmanns E, Bernhardt H J (1991) Abswurmbachite, CuMn6[O8/SiO4], a new mineral of the braunite group: natural occurrence, synthesis, and crystal structure Neues Jahrbuch fur Mineralogie, Abhandlungen 163 117-143 | 1991 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.475 Å | (10) |
2.702 Å | (100) |
2.350 Å | (15) |
1.663 Å | (10) |
1.416 Å | (10) |
1.402 Å | (10) |
Comments:
Synthetic compound lines: 1.651 instead of 1.663 (30); additional: 2.13 (15), 1.459 (14); not present or intensity-low: 3.475, 1.416
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Geological Setting:
In very low-grade, high-pressure metamorphic Mn, Al-rich quartzites.
Type Occurrence of Abswurmbachite
Co-Type Localities:
General Appearance of Type Material:
Anhedral grains to 50 microns.
Place of Conservation of Type Material:
Institute for Mineralogy, Ruhr University, Bochum, Germany; National Museum of Natural History, Washington, DC, USA
Geological Setting of Type Material:
In very low-grade, high pressure metamorphic quartzites
Associated Minerals at Type Locality:
Reference:
Reinecke T, Tillmanns E, Bernhardt H J (1991) Abswurmbachite, Cu2+Mn3+6[O8/SiO4], a new mineral of the braunite group: natural occurrence, synthesis, and crystal structure. Neues Jahrbuch für Mineralogie, Abhandlungen 163, 117-143
Synonyms of Abswurmbachite
Other Language Names for Abswurmbachite
Czech:Abswurmbachit
Dutch:Abswurmbachiet
German:Abswurmbachit
Italian:Abswurmbachite
Latvian:Absvurmbahīts
Russian:Абсвюрмбахит
Spanish:Abswurmbachita
Relationship of Abswurmbachite to other Species
Member of:
Other Members of this group:
Braunite | Mn2+Mn3+6(SiO4)O8 | Tet. 4/mmm (4/m 2/m 2/m) : I41/acd |
Braunite-II | CaMn3+14(SiO4)O20 | Tet. 4/mmm (4/m 2/m 2/m) : I41/acd |
Gatedalite | ZrMn2+2Mn3+4SiO12 | Tet. 4/mmm (4/m 2/m 2/m) : I41/acd |
Neltnerite | CaMn3+6(SiO4)O8 | Tet. 4/mmm (4/m 2/m 2/m) : I41/acd |
Related Minerals - Strunz-mindat Grouping
9.AG. | Ivanyukite-Na-T | Na2Ti4(SiO4)3(OH)O3 · 7H2O |
9.AG. | Ivanyukite-Na-C | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
9.AG. | Edgrewite | Ca9(SiO4)4F2 |
9.AG. | Aluminotaipingite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4F3 |
9.AG.02 | Gatedalite | ZrMn2+2Mn3+4SiO12 |
9.AG.2 | Skogbyite | Zr(Mg2Mn3+4)SiO12 |
9.AG.05 | Braunite | Mn2+Mn3+6(SiO4)O8 |
9.AG.05 | Neltnerite | CaMn3+6(SiO4)O8 |
9.AG.05 | Braunite-II | CaMn3+14(SiO4)O20 |
9.AG.10 | Långbanite | Mn2+4Mn3+9Sb5+O16(SiO4)2 |
9.AG.12 | Taipingite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3[SiO3(OH)]4F3 |
9.AG.15 | Malayaite | CaSn(SiO4)O |
9.AG.15 | Titanite | CaTi(SiO4)O |
9.AG.15 | Vanadomalayaite | CaV4+(SiO4)O |
9.AG.15 | Natrotitanite | (Na0.5Y0.5)Ti(SiO4)O |
9.AG.15 | Żabińskiite | Ca[Al0.5(Ta,Nb)0.5)](SiO4)O |
9.AG.20 | Cerite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3(SiO3OH)4(OH)3 |
9.AG.20 | Ferricerite-(LaCa) | (La6Ca3)◻Fe3+(SiO4)3(SiO3OH)4(OH)3 |
9.AG.20 | Aluminocerite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4(OH)3 |
9.AG.20 | Nipeiite-(Ce) | Ce9Fe3+(SiO4)6[SiO3(OH)](OH)3 |
9.AG.25 | Trimounsite-(Y) | Y2Ti2(SiO4)O5 |
9.AG.25 | Yftisite-(Y) | (Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6 |
9.AG.25 | Mieite-(Y) | Y4Ti(SiO4)2O[F,(OH)]6 |
9.AG.30 | Sitinakite | KNa2Ti4(SiO4)2O5(OH) · 4H2O |
9.AG.35 | Kittatinnyite | Ca2Mn2Mn(SiO4)2(OH)4 · 9H2O |
9.AG.40a | Natisite | Na2Ti(SiO4)O |
9.AG.40b | Paranatisite | Na2Ti(SiO4)O |
9.AG.45 | Törnebohmite-(Ce) | Ce2Al(SiO4)2(OH) |
9.AG.45 | Törnebohmite-(La) | La2Al(SiO4)2(OH) |
9.AG.50 | Kuliokite-(Y) | Y4Al(SiO4)2(OH)2F5 |
9.AG.50 | Ivanyukite-Na | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
9.AG.50 | Ivanyukite-K | K2Ti4(SiO4)3(OH)2O2 · 9H2O |
9.AG.50 | Ivanyukite-Cu | CuTi4(SiO4)3(OH)2O2 · 7H2O |
9.AG.50 | Hydroxyledgrewite | Ca9(SiO4)4(OH)2 |
9.AG.52 | Ulfanderssonite-(Ce) | (Ce15Ca)Σ16Mg2(SiO4)10(SiO3OH)(OH,F)5Cl3 |
9.AG.55 | Chantalite | CaAl2(SiO4)(OH)4 |
9.AG.60 | Mozartite | CaMn3+(SiO4)(OH) |
9.AG.60 | Vuagnatite | CaAl(SiO4)(OH) |
9.AG.65 | Hatrurite | Ca3(SiO4)O |
9.AG.70 | Jasmundite | Ca11(SiO4)4O2S |
9.AG.75 | Afwillite | Ca3(HSiO4)2 · 2H2O |
9.AG.80 | Bultfonteinite | Ca2(HSiO4)F · H2O |
9.AG.85 | Zoltaiite | BaV4+2V3+12(SiO4)2O19 |
9.AG.90 | Tranquillityite | (Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12 |
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 Abswurmbachite
mindat.org URL:
https://www.mindat.org/min-9.html
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References for Abswurmbachite
Localities for Abswurmbachite
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Greece (TL) | |
| Reinecke et al. (1991) |
| Reinecke et al. (1991) |
Japan | |
| The Mineral Species of Japan (5th ed) |
... +1 other reference |
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