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Coombsite

A valid IMA mineral species
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About CoombsiteHide

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.
Isostructural with:
Mn-analogue of zussmanite.

Compare the chemically and stoichiometrically very similar franklinphilite.
Compare also the chemically similar ganophyllite and parsettensite.


Unique IdentifiersHide

Mindat ID:
1122
Long-form identifier:
mindat:1:1:1122:4
GUID
(UUID V4):
5f8f5b00-1189-4994-aa50-5c9a3733b1f8

Classification of CoombsiteHide

Approved
First published:
1991
9.EG.35

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

Mineral SymbolsHide

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.

SymbolSourceReference
CmbIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
CmbWarr (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 CoombsiteHide

Transparency:
Translucent
Colour:
Pale brownish yellow
Density:
3.0(1) g/cm3 (Measured)    3.063 g/cm3 (Calculated)

Optical Data of CoombsiteHide

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.
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 CoombsiteHide

Formula:
KMn2+13(Si,Al)18O42(OH)14

Type material has Si:Al = 16.41:1.54.
Common Impurities:
Ti,Ca,Na

Crystallography of CoombsiteHide

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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest 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 CoombsiteHide

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 CoombsiteHide

Other Language Names for CoombsiteHide

German:Coombsit
Spanish:Coombsita

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Coombsite associated with RhodoniteCaMn3Mn[Si5O15]
1 photo of Coombsite associated with AlbiteNa(AlSi3O8)
1 photo of Coombsite associated with BrauniteMn2+Mn3+6(SiO4)O8
1 photo of Coombsite associated with RhodochrositeMnCO3

Related Minerals - Strunz-mindat GroupingHide

9.EG.05CymriteBaAl2Si2(O,OH)8 · H2OMon. 2 : P21
9.EG.10Naujakasite(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26Mon. 2/m : B2/m
9.EG.10ManganonaujakasiteNa6(Mn2+,Fe2+)Al4Si8O26Mon. 2/m : B2/m
9.EG.15DmisteinbergiteCa(Al2Si2O8)Trig. 3 2 : P3 1 2
9.EG.20KampfiteBa12(Si11Al5)O31(CO3)8Cl5Mon. m
9.EG.25SträtlingiteCa2Al2SiO7 · 8H2OTrig. 3m : R3m
9.EG.25VertumniteCa4Al4Si4O6(OH)24 · 3H2OMon. 2/m : P21/m
9.EG.30Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2OMon.
9.EG.30Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2OMon. 2/m
9.EG.30Tamaite(Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2OMon. 2/m : P21/b
9.EG.35ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14Trig. 3 : R3
9.EG.40Franklinphilite(K,Na)4(Mn2+,Mg,Zn)48(Si,Al)72(O,OH)216 · 6H2OTric.
9.EG.40LennilenapeiteK6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2OTric.
9.EG.40Parsettensite(K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2OMon. 2/m : B2/m
9.EG.40Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2OTric. 1 : P1
9.EG.40ChalcoditeK(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27Tric. 1 : P1
9.EG.45Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)Mon. 2 : P21
9.EG.45TuscaniteKCa6(Si,Al)10O22(SO4,CO3)2(OH) · H2OMon. 2/m : P21/b
9.EG.45LevantiteKCa3Al2(SiO4)(Si2O7)(PO4)Mon. 2 : P21
9.EG.50JagoitePb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6Hex. 6 m2 : P6c2
9.EG.55WickenburgiteCaPb3Al2Si10O24(OH)6Trig. 3m : P3 1c
9.EG.60HyttsjöitePb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2OTrig. 3 : R3
9.EG.65ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2OMon. 2/m : B2/m
9.EG.70Britvinite[Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)]Tric. 1 : P1
9.EG.70RoymilleritePb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5Tric. 1 : P1
9.EG.75Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2OMon. 2/m : B2/b
9.EG.75UM1989-30-SiO:AlBaCaFeHKMgMn(Ba,Ca)(Mn,Fe,Mg)22(Si,Al)32O76(OH)16 · 12H2O
9.EG.75KayupovaiteNa2Mn10[(Si14Al2)O38(OH)8] · 7H2OMon. 2/m : B2/b

Other InformationHide

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 CoombsiteHide

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 CoombsiteHide

Localities for CoombsiteHide

This 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.

Locality ListHide

- 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.
Austria
 
  • Salzburg
    • Tamsweg District
      • Tweng
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
 
  • Minas Gerais
Gunnar Färber Minerals
New Zealand (TL)
 
  • Otago Region
    • Clutha District
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
 
  • Suceava County
    • Iacobeni
http://minerals-of-the-carpathians.eu
Russia
 
  • Chelyabinsk Oblast
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.
  • Nenets Autonomous Okrug
    • Yugorskii Peninsula
      • Pai-Khoi Range (Paikhoi; Pay Khoy)
Старикова, Е. В. (2011). Минералогия родонитовых пород Силоваяхинского проявления, Пай-хой. Записки Российского минералогического общества, 140(5), 75-91.
 
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