Coombsite
A valid IMA mineral species
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About Coombsite
Formula:
KMn2+13(Si,Al)18O42(OH)14
Type material has Si:Al = 16.41:1.54.
Colour:
Pale brownish yellow
Specific Gravity:
3.0
Crystal System:
Trigonal
Name:
Named in 1991 by Teruhiko Sameshima and Yosuke Kawachi in honor of Douglas S. Coombs (23 November 1924 – 23 December 2016), professor of geology at the University of Otago, New Zealand. Coombs first described progressive mineralogical changes, especially relating to zeolites, due to low grade burial metamorphism. Coombs named wairakite, ferroceladonite, and ferroaluminoceladonite.
Type Locality:
Isostructural with:
Mn-analogue of zussmanite.
Compare the chemically and stoichiometrically very similar franklinphilite.
Compare also the chemically similar ganophyllite and parsettensite.
Compare the chemically and stoichiometrically very similar franklinphilite.
Compare also the chemically similar ganophyllite and parsettensite.
Unique Identifiers
Mindat ID:
1122
Long-form identifier:
mindat:1:1:1122:4
GUID
(UUID V4):
(UUID V4):
5f8f5b00-1189-4994-aa50-5c9a3733b1f8
Classification of Coombsite
Approved
First published:
1991
9.EG.35
9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
16.16.18
16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Symbol | Source | Reference |
---|---|---|
Cmb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Cmb | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Physical Properties of Coombsite
Transparency:
Translucent
Colour:
Pale brownish yellow
Density:
3.0(1) g/cm3 (Measured) 3.063 g/cm3 (Calculated)
Optical Data of Coombsite
Type:
Uniaxial (-)
RI values:
nω = 1.619(1) nε = 1.600(1)
Max Birefringence:
δ = 0.019
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
Parallel extinction, length slow.
Pleochroism:
Weak
Comments:
First-order red to purple interference colours in standard thin sections.
Chemical Properties of Coombsite
Formula:
KMn2+13(Si,Al)18O42(OH)14
Type material has Si:Al = 16.41:1.54.
Type material has Si:Al = 16.41:1.54.
Common Impurities:
Ti,Ca,Na
Crystallography of Coombsite
Crystal System:
Trigonal
Cell Parameters:
a = 11.82 Å, c = 29.14 Å
Ratio:
a:c = 1 : 2.465
Unit Cell V:
3,525.78 ų (Calculated from Unit Cell)
Comment:
Space group R3 or R-3.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.68 Å | (100) |
4.835 Å | (30) |
3.241 Å | (25) |
2.793 Å | (70) |
2.556 Å | (90) |
2.241 Å | (50) |
Comments:
Very similar to the data of zussmanite.
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 | |
Stage 5: Initiation of plate tectonics | <3.5-2.5 |
40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Coombsite
General Appearance of Type Material:
Aggregates of fibro-lamellar crystals up to 20 micron in length, and often shows semispherulitic texture.
Place of Conservation of Type Material:
The type material (OU34460) is deposited in the Museum of the Geology Department, University of Otago, and Smithsonian Institution, Washington, D.C., U.S.A.
Geological Setting of Type Material:
A 50 cm thick rhodonite-quartz lens.
Associated Minerals at Type Locality:
Synonyms of Coombsite
Other Language Names for Coombsite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
9.EG.05 | Cymrite | BaAl2Si2(O,OH)8 · H2O | Mon. 2 : P21 |
9.EG.10 | Naujakasite | (Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26 | Mon. 2/m : B2/m |
9.EG.10 | Manganonaujakasite | Na6(Mn2+,Fe2+)Al4Si8O26 | Mon. 2/m : B2/m |
9.EG.15 | Dmisteinbergite | Ca(Al2Si2O8) | Trig. 3 2 : P3 1 2 |
9.EG.20 | Kampfite | Ba12(Si11Al5)O31(CO3)8Cl5 | Mon. m |
9.EG.25 | Strätlingite | Ca2Al2SiO7 · 8H2O | Trig. 3m : R3m |
9.EG.25 | Vertumnite | Ca4Al4Si4O6(OH)24 · 3H2O | Mon. 2/m : P21/m |
9.EG.30 | Eggletonite | (Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O | Mon. |
9.EG.30 | Ganophyllite | (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O | Mon. 2/m |
9.EG.30 | Tamaite | (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2O | Mon. 2/m : P21/b |
9.EG.35 | Zussmanite | K(Fe,Mg,Mn)13(Si,Al)18O42(OH)14 | Trig. 3 : R3 |
9.EG.40 | Franklinphilite | (K,Na)4(Mn2+,Mg,Zn)48(Si,Al)72(O,OH)216 · 6H2O | Tric. |
9.EG.40 | Lennilenapeite | K6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2O | Tric. |
9.EG.40 | Parsettensite | (K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2O | Mon. 2/m : B2/m |
9.EG.40 | Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O | Tric. 1 : P1 |
9.EG.40 | Chalcodite | K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27 | Tric. 1 : P1 |
9.EG.45 | Latiumite | (Ca,K)4(Si,Al)5O11(SO4,CO3) | Mon. 2 : P21 |
9.EG.45 | Tuscanite | KCa6(Si,Al)10O22(SO4,CO3)2(OH) · H2O | Mon. 2/m : P21/b |
9.EG.45 | Levantite | KCa3Al2(SiO4)(Si2O7)(PO4) | Mon. 2 : P21 |
9.EG.50 | Jagoite | Pb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6 | Hex. 6 m2 : P6c2 |
9.EG.55 | Wickenburgite | CaPb3Al2Si10O24(OH)6 | Trig. 3m : P3 1c |
9.EG.60 | Hyttsjöite | Pb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2O | Trig. 3 : R3 |
9.EG.65 | Armbrusterite | K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O | Mon. 2/m : B2/m |
9.EG.70 | Britvinite | [Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)] | Tric. 1 : P1 |
9.EG.70 | Roymillerite | Pb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5 | Tric. 1 : P1 |
9.EG.75 | Bannisterite | (Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O | Mon. 2/m : B2/b |
9.EG.75 | UM1989-30-SiO:AlBaCaFeHKMgMn | (Ba,Ca)(Mn,Fe,Mg)22(Si,Al)32O76(OH)16 · 12H2O | |
9.EG.75 | Kayupovaite | Na2Mn10[(Si14Al2)O38(OH)8] · 7H2O | Mon. 2/m : B2/b |
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.
References for Coombsite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sameshima, T. and Kawachi, Y. (1991): Coombsite, manganese analogue of zussmanite, and associated Mn-silicates, parsettensite and caryopilite, from southeast Otago, New Zealand. Journal of Geology and Geophysics, 34, 329-335.
Mandarino, J.A. (1997) New Minerals 1990-1994. The Mineralogical Record, Tucson, Arizona, 220 pgs.
Semkova, T. A.; Brusnitsyn, A. I.; Chukanov, N. V.; Britvin, S. N. (2002): Coombsite from Kozhaevskoe manganese ore deposit (southern Urals). Zapiski Vserossiiskogo Mineralogicheskogo Obshchestva, 131, 101-108.
Internet Links for Coombsite
mindat.org URL:
https://www.mindat.org/min-1122.html
Please feel free to link to this page.
Please feel free to link to this page.
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Localities for Coombsite
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.
Austria | |
| Kolitsch, U., Schachinger, T., Auer, C. (2021): 2209) Weitere mineralogische Untersuchungen an dem metamorphen jurassischen Manganvorkommen im Bereich der Fuchsalm in der Hochfeindgruppe, Radstädter Tauern, Salzburg: Nachweise von Arseniopleit, Arsenmedait, Celsian, Coombsit, Fluorcalcioroméit, Gasparit-(Ce), Gasparit-(La), Nd-dominanter Gasparit, Hedyphan, Hejtmanit, Hydrocalcioroméit, Konichalcit, Magnesio-Arfvedsonit, Mimetesit und sein unbenanntes OH-Analogon, Pyrobelonit, Sarkinit, Suzukiit/Bavsiit, Tilasit, Tiragalloit, das unbenannte Epidotgruppenglied CaSr(Fe3+AlMn3+)¬(Si2O7)¬(SiO4)¬O(OH) und weiteren Mineralien. Pp. 225-246 in Walter, F. et al. (2021): Neue Mineralfunde aus Österreich LXX. Carinthia II, 211./131., 187-276. |
Brazil | |
| Gunnar Färber Minerals |
New Zealand (TL) | |
| Sameshima, T., Kawachi, Y. (1991) Coombsite, Mn analogue of zussmanite, and associated Mn-silicates, parsettensite and caryopilite, from southeast Otago, New Zealand. New Zealand Journal of Geology and Geophysics, 34:3, 329-335. |
Romania | |
| http://minerals-of-the-carpathians.eu |
Russia | |
| Semkova, T. A.; Brusnitsyn, A. I.; Chukanov, N. V.; Britvin, S. N. (2002): Coombsite from Kozhaevskoe manganese ore deposit (southern Urals). Zapiski Vserossiiskogo Mineralogicheskogo Obshchestva 131, 101-108. |
| Старикова, Е. В. (2011). Минералогия родонитовых пород Силоваяхинского проявления, Пай-хой. Записки Российского минералогического общества, 140(5), 75-91. |
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Watsons Beach, Clutha District, Otago Region, New Zealand