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Coombsite

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Formula:
K(Mn,Fe,Mg)
 
13
(Si,Al)
 
18
O
 
42
(OH)
 
14
System:TrigonalColour:Pale brownish yellow
Name:Named in 1991 by Teruhiko Sameshima and Yosuke Kawachi in honor of Douglas S. Coombs, 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:Zussmanite


Mn-analogue of zussmanite.

Classification of Coombsite

IMA status:Approved
Strunz 8th edition ID:8/H.40-20
Nickel-Strunz 10th (pending) edition ID:9.EG.35

9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
Hey's CIM Ref.:16.16.18

16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
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Type Occurrence of Coombsite

Type Locality:Watsons Beach, Otago, South Island, New Zealand
General Appearance of Type Material:Aggregates of fibro-lamellar crystals up
to 20 micron in length, and often shows semispherulitic texture.
Year of Discovery:1991
Geological Setting of type material:A 50 cm thick rhodonite-quartz lens.
Associated Minerals at type locality:
RhodoniteQuartzParsettensiteCaryopilite

Physical Properties of Coombsite

Colour:Pale brownish yellow

Crystallography of Coombsite

Crystal System:Trigonal
Cell Parameters:a = 11.82Å, c = 29.14Å
Ratio:a:c = 1 : 2.465
Unit Cell Volume:V 3,525.78 ų (Calculated from Unit Cell)

Optical Data of Coombsite

Type:Uniaxial (-)
RI values: nω = 1.619 nε = 1.600
Maximum Birefringence:δ = 0.019

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Coombsite

Formula:
K(Mn,Fe,Mg)
 
13
(Si,Al)
 
18
O
 
42
(OH)
 
14
Simplified for copy/paste:K(Mn,Fe,Mg)13(Si,Al)18O42(OH)14
Essential elements:H, K, Mn, O, Si
All elements listed in formula:Al, Fe, H, K, Mg, Mn, O, Si
Common Impurities:Ti,Ca,Na

Relationship of Coombsite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EG.05Cymrite
BaAl
 
2
Si
 
2
(O,OH)
 
8
· H
 
2
O
9.EG.10Naujakasite
(Na,K)
 
6
(Fe
2+
 
,Mn
2+
 
,Ca)(Al,Fe)
 
4
Si
 
8
O
 
26
9.EG.10Manganonaujakasite
Na
 
6
(Mn
2+
 
,Fe
2+
 
)Al
 
4
Si
 
8
O
 
26
9.EG.15Dmisteinbergite
CaAl
 
2
Si
 
2
O
 
8
9.EG.20Kampfite
Ba
 
12
(Si
 
11
Al
 
5
)O
 
31
(CO
 
3
)
 
8
Cl
 
5
9.EG.25Strätlingite
Ca
 
2
Al
 
2
SiO
 
7
· 8H
 
2
O
9.EG.25Vertumnite
Ca
 
4
Al
 
4
Si
 
4
O
 
6
(OH)
 
24
· 3H
 
2
O
9.EG.30Eggletonite
(Na,K,Ca)
 
2
(Mn,Fe)
 
8
(Si,Al)
 
12
O
 
29
(OH)
 
7
· 11H
 
2
O
9.EG.30Ganophyllite
(K,Na,Ca)
 
2
Mn
 
8
(Si,Al)
 
12
(O,OH)
 
32
· 8H
 
2
O
9.EG.30Tamaite
(Ca,K,Ba,Na)
 
3-4
Mn
 
24
(Si,Al)
 
40
(O,OH)
 
112
· 21H
 
2
O
9.EG.35Zussmanite
K(Fe,Mg,Mn)
 
13
(Si,Al)
 
18
O
 
42
(OH)
 
14
9.EG.40Franklinphilite
(K,Na)
 
4
(Mn,Zn,Mg,Fe)
 
48
(Si,Al)
 
72
(O,OH)
 
216
· 6H
 
2
O
9.EG.40Lennilenapeite
K
 
6-7
(Mg,Mn,Fe,Zn)
 
48
(Si,Al)
 
72
(O,OH)
 
216
· 16H
 
2
O
9.EG.40Parsettensite
K
 
1.2
Mn
 
8
(Si,Al)
 
12
O
 
26
(OH)
 
10
9.EG.40Stilpnomelane
(K,Ca,Na)(Fe
2+
 
,Mg,Al,Fe
3+
 
)
 
8
(Si,Al)
 
12
(O,OH)
 
36
· nH
 
2
O
9.EG.45Latiumite
(Ca,K)
 
4
(Si,Al)
 
5
O
 
11
(SO
 
4
,CO
 
3
)
9.EG.45Tuscanite
(K(Ca,Na)
 
6
(Si,Al)
 
10
O
 
22
[SO
 
4
,CO
 
3
,(OH)
 
2
] · H
 
2
O
9.EG.50Jagoite
Pb
 
18
Fe
3+
4
[Si
 
4
(Si,Fe
3+
 
)
 
6
][Pb
 
4
Si
 
16
(Si,Fe)
 
4
]O
 
82
Cl
 
6
9.EG.55Wickenburgite
CaPb
 
3
Al
 
2
Si
 
10
O
 
24
(OH)
 
6
9.EG.60Hyttsjöite
Pb
 
18
Ba
 
2
Ca
 
5
Mn
2+
2
Fe
3+
2
Si
 
30
O
 
90
Cl · 6H
 
2
O
9.EG.65Armbrusterite
K
 
5
Na
 
7
Mn
 
15
[(Si
 
9
O
 
22
)
 
4
](OH)
 
10
· 4H
 
2
O
9.EG.70Britvinite
[Pb
 
7
(OH)
 
3
F(BO
 
3
)
 
2
(CO
 
3
)][Mg
 
4.5
(OH)
 
3
(Si
 
5
O
 
14
)]
9.EG.75Bannisterite
Ca
 
0.5
(K,Na)
 
0.5
(Mn,Fe,Zn)
 
10
(Si,Al)
 
16
O
 
38
(OH)
 
8
· 5.5H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
16.16.1Kanonaite
Mn
3+
 
Al(SiO
 
4
)O
16.16.2Spessartine
Mn
2+
3
Al
 
2
(SiO
 
4
)
 
3
16.16.3Davreuxite
MnAl
 
6
Si
 
4
O
 
17
(OH)
 
2
16.16.4Sursassite
Mn
2+
2
Al
 
3
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
3
16.16.5Carpholite
Mn
2+
 
Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
16.16.6Kellyite
Mn
2+
2
Al(AlSiO
 
5
)(OH)
 
4
16.16.7Pennantite
Mn
2+
5
Al(AlSi
 
3
O
 
10
)(OH)
 
8
16.16.8Akatoreite
(Mn
2+
 
,Fe
2+
 
)
 
9
Al
 
2
(HSi
 
4
O
 
13
)
 
2
(OH)
 
6
16.16.9Ganophyllite
(K,Na,Ca)
 
2
Mn
 
8
(Si,Al)
 
12
(O,OH)
 
32
· 8H
 
2
O
16.16.10Mangano-arfvedsonite
[Na][Na
 
2
][Mn
2+
4
(Fe
3+
 
)]Si
 
8
O
 
22
(OH)
 
2
16.16.11Masutomilite
(K,Rb)(Li,Mn
3+
 
,Al)
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
16.16.13Howieite
Na(Fe,Mn)
 
10
(Fe,Al)
 
2
Si
 
12
O
 
31
(OH)
 
13
16.16.14Eggletonite
(Na,K,Ca)
 
2
(Mn,Fe)
 
8
(Si,Al)
 
12
O
 
29
(OH)
 
7
· 11H
 
2
O
16.16.15Bannisterite
Ca
 
0.5
(K,Na)
 
0.5
(Mn,Fe,Zn)
 
10
(Si,Al)
 
16
O
 
38
(OH)
 
8
· 5.5H
 
2
O
16.16.16Taneyamalite
(Na,Ca)(Mn,Mg,Fe)
 
12
Si
 
12
(O,OH)
 
44
16.16.17Zussmanite
K(Fe,Mg,Mn)
 
13
(Si,Al)
 
18
O
 
42
(OH)
 
14
16.16.19Henritermierite
Ca
 
3
(Mn
3+
 
,Al)
 
2
(SiO
 
4
)
 
2
(OH)
 
4
16.16.20Macfallite
Ca
 
2
(Mn
3+
 
,Al)
 
3
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
3
16.16.21Ottrélite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
(SiO
 
4
)O(OH)
 
2
16.16.22Piemontite
{Ca
 
2
}{Al
 
2
Mn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
16.16.23Okhotskite
Ca
 
2
(Mn
2+
 
,Mg)(Mn
3+
 
,Al,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
· H
 
2
O
16.16.24Pumpellyite-(Mn2+)
Ca
 
2
(Mn
2+
 
,Mg)(Al,Mn
3+
 
,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
· H
 
2
O
16.16.25Piemontite-(Sr)
{CaSr}{Al
 
2
Mn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)

Other Names for Coombsite

Synonyms:
IMA1989-058
Other Languages:
German:Coombsit
Spanish:Coombsita

Other Information

Health Warning: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:

- +
New Minerals (1997), New Minerals 1990-1994.

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.

Internet Links for Coombsite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Coombsite details from Handbook of Mineralogy (PDF)
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  • Localities for Coombsite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Brazil
     
    • Minas Gerais
    Farber Minerals
    New Zealand
     
    • South Island
      • Otago
    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, 329-335
    Romania
     
    • Suceava Co.
      • Suceava district
        • Iacobeni (Jakobeny; Jacobeny; Jakabfalva)
    http://minerals-of-the-carpathians.eu
    Mineral and/or Locality  
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