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Kentbrooksite

Big Photo

Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© B. Otter

Show Kentbrooksite Photos (12)
Formula:
(Na,REE)
 
15
(Ca,REE)
 
6
(Mn
2+
 
,Fe
2+
 
)
 
3
Zr
 
3
Nb[Si
 
25
O
 
74
]F
 
2
·2H
 
2
O
System:TrigonalColour:Yellow-brown.
Lustre:VitreousHardness:5 - 6
Name:For Dr. C. Kent Brooks (1943-), leader of fourteen geological expeditions to the Kangerdlugssuaq area of east Greenland.


Eudialyte Group

Classification of Kentbrooksite

IMA status:Approved
Strunz 8th edition ID:8/E.23-20
Nickel-Strunz 10th (pending) edition ID:9.CO.10

9 : SILICATES (Germanates)
C : Cyclosilicates
O : [Si9O27]18- 9-membered rings
Dana 7th edition ID:64.1.1.3
Dana 8th edition ID:64.1.2.1

64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
1 : Rings with Other Anions and Insular Silicate Groups with mixed ring types
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Type Occurrence of Kentbrooksite

Type Locality:Amdrup Firth, Kangerlussuaq complex, Kangerlussuaq Firth, Tunu (East Greenland) Province, Greenland

Physical Properties of Kentbrooksite

Lustre:Vitreous
Colour:Yellow-brown.
Streak:White.
Hardness (Mohs):5 - 6

Crystallography of Kentbrooksite

Crystal System:Trigonal

Optical Data of Kentbrooksite

Type:Uniaxial (-)
RI values: nω = 1.628 nε = 1.623
Maximum Birefringence:δ = 0.005

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

Chemical Properties of Kentbrooksite

Formula:
(Na,REE)
 
15
(Ca,REE)
 
6
(Mn
2+
 
,Fe
2+
 
)
 
3
Zr
 
3
Nb[Si
 
25
O
 
74
]F
 
2
·2H
 
2
O
Essential elements:Ca, F, H, Mn, Na, Nb, O, Si, Zr
All elements listed in formula:Ca, F, Fe, H, Mn, Na, Nb, O, Si, Zr

Relationship of Kentbrooksite to other Species

Member of:Eudialyte Group
Related Minerals - Nickel-Strunz Grouping):

- +
9.CO.10Alluaivite
Na
 
19
(Ca,Mn)
 
6
(Ti,Nb)
 
3
Si
 
26
O
 
74
Cl·2H
 
2
O
9.CO.10Eudialyte
Na
 
15
Ca
 
6
(Fe
2+
 
,Mn
2+
 
)
 
3
Zr
 
3
[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
9.CO.10Ferrokentbrooksite
Na
 
15
Ca
 
6
(Fe,Mn)
 
3
Zr
 
3
NbSi
 
25
O
 
73
(O,OH,H
 
2
O)
 
3
Cl
 
2
9.CO.10Khomyakovite
Na
 
12
Sr
 
3
Ca
 
6
Fe
 
3
Zr
 
3
W[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
9.CO.10Manganokhomyakovite
Na
 
12
Sr
 
3
Ca
 
6
Mn
 
3
Zr
 
3
W[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
9.CO.10Oneillite
Na
 
15
Ca
 
3
Mn
 
3
Fe
2+
3
Zr
 
3
Nb(Si
 
25
O
 
73
)(O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
9.CO.10Raslakite
Na
 
15
Ca
 
3
Fe
2+
3
(Na,Zr)
 
3
Zr
 
3
Nb
 
<0.5
[(Cl,OH)|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
SiO] · 3(OH,H
 
2
O)
9.CO.10Feklichevite
Na
 
11
Ca
 
9
(Fe
3+
 
,Fe
2+
 
)
 
2
Zr
 
3
Nb[Si
 
25
O
 
73
](OH,H
 
2
O,Cl,O)
 
5
9.CO.10Carbokentbrooksite
Na
 
11-12
(Na,Ce)
 
3
Ca
 
6
Mn
 
3
Zr
 
3
Nb[(OH)
 
3
|CO
 
3
|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
SiO] · H
 
2
O
9.CO.10Zirsilite-(Ce)
Na
 
11-12
(Ce,Na)
 
3
Ca
 
6
Mn
 
3
Zr
 
3
Nb[(OH)
 
3
|CO
 
3
|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
SiO] · H
 
2
O
9.CO.10Ikranite
(Na,H
 
3
O)
 
15
(Ca,Mn
2+
 
)
 
6
Fe
3+
2
Zr
 
3-4
[Cl|(H
 
0-3
Si
 
3
O
 
9
)
 
2
|{(Si
 
9
O
 
27
)
 
2
,(Si
 
9
O
 
27
)
 
2
SiO}] · 2-3H
 
2
O
9.CO.10Taseqite
Na
 
12
Sr
 
3
Ca
 
6
Fe
 
3
Zr
 
3
Nb[Cl
 
2
|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
SiO] · 3(O,OH,H
 
2
O)
9.CO.10Rastsvetaevite
Na
 
27
K
 
8
Ca
 
12
Fe
 
3
Zr
 
6
Si
 
52
O
 
144
(O,OH,H
 
2
O)
 
6
Cl
 
2
9.CO.10Golyshevite
[Na
 
10
Ca
 
3
]Ca
 
6
Zr
 
3
Fe
 
2
SiNb[(OH)
 
3
|CO
 
3
|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
] · H
 
2
O
9.CO.10Labyrinthite
(Na,K,Sr)
 
35
Ca
 
12
Fe
 
3
Zr
 
6
TiSi
 
51
O
 
144
(O,OH,H
 
2
O)
 
9
Cl
 
3
9.CO.10Johnsenite-(Ce)
Na
 
12
(Ce,La,Sr,Ca)
 
3
Ca
 
6
Mn
 
3
Zr
 
3
W[(OH,Cl)
 
2
|CO
 
3
|(Si
 
3
O
 
9
)
 
2
|(Si
 
9
O
 
27
)
 
2
SiO] · H
 
2
O
9.CO.10Mogovidite
Na
 
9
(Ca,Na)
 
5
Ca
 
6
Zr
 
3
Fe
 
2
(Si,Nb)[(OH,H
 
2
O)
 
3
|Cl
 
0.3
|CO
 
3
|(Si
 
3
O
 
9
)
 
2
(Si
 
9
O
 
27
)
 
2
]
9.CO.10Georgbarsanovite
Na
 
12
(Mn,Sr,REE)
 
3
Ca
 
6
Fe
2+
3
Zr
 
3
NbSi
 
25
O
 
76
Cl
 
2
·H
 
2
O
9.CO.10Aqualite
(H
 
3
O)
 
8
(Na,K,Sr)
 
5
Ca
 
6
Zr
 
3
Si
 
26
O
 
66
(OH)
 
9
Cl
9.CO.10Dualite
Na
 
30
(Ca,Na,Ce,Sr)
 
12
(Na,Mn,Fe,Ti)
 
6
Zr
 
3
Ti
 
3
Mn[Si
 
51
O
 
144
](OH,H
 
2
O,Cl)
 
9
9.CO.10Andrianovite
Na
 
12
(K,Sr,Ce)
 
3
Ca
 
6
Mn
 
3
Zr
 
3
Nb(Si
 
25
O
 
73
)(O,H
 
2
O,OH)
 
5
9.CO.10Voronkovite
Na
 
15
(Na,Ca,Ce)
 
3
(Mn,Ca)
 
3
Fe
 
3
Zr
 
3
Si
 
26
O
 
72
(OH,O)
 
4
Cl·H
 
2
O
9.CO.10UM1999-36-SiO:CaCeHMnNaNbSrZr
Na
 
17
(Ca,Ce,Sr)
 
2
Mn
 
3
(Zr,Nb)
 
4
Si
 
25
O
 
73
(O,OH,F,Cl)
 
5
9.CO.10UM2000-66-SiO:CaClFeHMnNaNbSrZr
Na
 
12
(Ca,Mn)
 
6
(Sr,Na,K)
 
3
(Fe,Mn)
 
3
(Zr,Nb)
 
4
Si
 
25
O
 
66
(OH,Cl)
 
11
9.CO.10IMA2009-039
Na
 
14
Ca
 
6
Mn
 
3
Zr
 
3
[Si
 
26
O
 
72
(OH)
 
2
](H
 
2
O,Cl,O,OH)
 
6
Related Minerals - Dana Grouping):

- +
64.1.1.0Eudialyte Group
64.1.1.1Eudialyte
Na
 
15
Ca
 
6
(Fe
2+
 
,Mn
2+
 
)
 
3
Zr
 
3
[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
64.1.1.2Feklichevite
Na
 
11
Ca
 
9
(Fe
3+
 
,Fe
2+
 
)
 
2
Zr
 
3
Nb[Si
 
25
O
 
73
](OH,H
 
2
O,Cl,O)
 
5
64.1.1.4Khomyakovite
Na
 
12
Sr
 
3
Ca
 
6
Fe
 
3
Zr
 
3
W[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
64.1.1.5Manganokhomyakovite
Na
 
12
Sr
 
3
Ca
 
6
Mn
 
3
Zr
 
3
W[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2

Other Names for Kentbrooksite

Synonyms:
IMA1996-023
Other Languages:
German:Kentbrooksit
Russian:Кентбруксит
Spanish:Kentbrooksita

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 Kentbrooksite

Reference List:Johnsen, O., Grice, J.D., and Gault, R.A. (1998) Kentbrooksite from the Kangerdlugssuaq intrusion, East Greenland, a new Mn-REE-Nb-F end-member in a series within the eudialyte group: description and crystal structure. European Journal of Mineralogy (1998): 10: 207-219.

Khomyakov, A.P., Nechelyustov, G.N., Rastsvetaeva, R.K. (2007): Aqualite, (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl, a new eudialyte-group mineral from Inagli alkaline massif (Sakha-Yakutia,Russia),and the problem of oxonium in hydrated eudialytes. Proceedings of the Russian Mineralogical Society (Zapiski RMO), 136(2), 39-55.

Internet Links for Kentbrooksite

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    Localities for Kentbrooksite

    Hide Locality List
    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
     
    • Southeast Region
      • Minas Gerais
        • Poços de Caldas plateau
    		Atencio et al.(2000) 4th international conference mineralogy and museuns, program and abstracts volume, p23.
    Canada
     
    • Québec
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		EJM 10:207-219(1998)
    Greenland
     
    • Tunu (East Greenland) Province
      • Kangerlussuaq Firth
        • Kangerlussuaq complex
    		Eur. J. Mineral., 10, 207­-219.
    Norway
     
    • Telemark
      • Porsgrunn
        • Mørje
          • Sagåsen (Strandåsen)
    		A. O. Larsen, A. Åsheim and R. A. Gault, 2005.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
            • Kukisvumchorr Mt
              • East slope
                • Tuliok River head
    		Pavel M. Kartashov data
              • Hackman Valley
    		Neues Jahrbuch für Mineralogie, Monatshefte (2003): 10: 461-480.
    www.koeln.netsurf.de/~w.steffens/lovo.htm
    Tajikistan
     
    • Region of Republican Subordination
      • Tien Shan Mts
        • Alai (Alayskiy) Range
    		Lapis 29(1), 47 (2004); Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 132(6): 15-21 (in Russian).
    USA
     
    • New Mexico
      • Otero Co.
        • Cornudas Mountains
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 2nd Nov 2009 18:13:30