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Kentbrooksite

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Big Photo

Lovchorrite Mine, Hackman Valley, Yukspor Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© L.C. 2011

Show Kentbrooksite Photos (17)



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
Member of:Eudialyte Group
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:Kentbrooksite occurrence, Amdrup Firth, 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
Other Members of Group:

- +
Alluaivite
Na
 
19
(Ca,Mn)
 
6
(Ti,Nb)
 
3
Si
 
26
O
 
74
Cl · 2H
 
2
O
Andrianovite
Na
 
12
(K,Sr,Ce)
 
3
Ca
 
6
Mn
 
3
Zr
 
3
Nb(Si
 
25
O
 
73
)(O,H
 
2
O,OH)
 
5
Aqualite
(H
 
3
O)
 
8
(Na,K,Sr)
 
5
Ca
 
6
Zr
 
3
Si
 
26
O
 
66
(OH)
 
9
Cl
Carbokentbrooksite
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
Davinciite
Na
 
12
K
 
3
Ca
 
6
Fe
2+
3
Zr
 
3
(Si
 
26
O
 
73
OH)Cl
 
2
Dualite
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
Eudialyte
Na
 
15
Ca
 
6
(Fe
2+
 
,Mn
2+
 
)
 
3
Zr
 
3
[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
Feklichevite
Na
 
11
Ca
 
9
(Fe
3+
 
,Fe
2+
 
)
 
2
Zr
 
3
Nb[Si
 
25
O
 
73
](OH,H
 
2
O,Cl,O)
 
5
Fengchengite
Na
 
12
◻
 
3
(Ca,Sr)
 
6
Fe
3+
3
 Zr
 
3
Si(Si
 
25
O
 
73
)(H
 
2
O,OH)
 
3
(OH,Cl)
 
2
Ferrokentbrooksite
Na
 
15
Ca
 
6
(Fe,Mn)
 
3
Zr
 
3
NbSi
 
25
O
 
73
(O,OH,H
 
2
O)
 
3
Cl
 
2
Georgbarsanovite
Na
 
12
(Mn,Sr,REE)
 
3
Ca
 
6
Fe
2+
3
Zr
 
3
NbSi
 
25
O
 
76
Cl
 
2
·H
 
2
O
Golyshevite
Na
 
10
Ca
 
3
Ca
 
6
Zr
 
3
Fe
 
2
SiNb(Si
 
3
O
 
9
)
 
2
(Si
 
9
O
 
27
)
 
2
CO
 
3
(OH)
 
3
 · H
 
2
O
Ikranite
(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
Johnsenite-(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
Khomyakovite
Na
 
12
Sr
 
3
Ca
 
6
Fe
 
3
Zr
 
3
W[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
Labyrinthite
(Na,K,Sr)
 
35
Ca
 
12
Fe
 
3
Zr
 
6
TiSi
 
51
O
 
144
(O,OH,H
 
2
O)
 
9
Cl
 
3
Manganoeudialyte
Na
 
14
Ca
 
6
Mn
 
3
Zr
 
3
[Si
 
26
O
 
72
(OH)
 
2
](H
 
2
O,Cl,O,OH)
 
6
Manganokhomyakovite
Na
 
12
Sr
 
3
Ca
 
6
Mn
 
3
Zr
 
3
W[Si
 
25
O
 
73
](O,OH,H
 
2
O)
 
3
(OH,Cl)
 
2
Mogovidite
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
]
Oneillite
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
Raslakite
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)
Rastsvetaevite
Na
 
27
K
 
8
Ca
 
12
Fe
 
3
Zr
 
6
Si
 
52
O
 
144
(O,OH,H
 
2
O)
 
6
Cl
 
2
Taseqite
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)
UM1998-21-SiO:CaCeClHMnNaZr
Na
 
16
Ca
 
6
(Mn,Ce)
 
3
Zr
 
3
(Si
 
3
O
 
9
)
 
2
(Si
 
9
O
 
27
)
 
2
(OH,Cl)
 
4
Voronkovite
Na
 
15
(Na,Ca,Ce)
 
3
(Mn,Ca)
 
3
Fe
 
3
Zr
 
3
Si
 
26
O
 
72
(OH,O)
 
4
Cl · H
 
2
O
Zirsilite-(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
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(Si
 
3
O
 
9
)
 
2
(Si
 
9
O
 
27
)
 
2
CO
 
3
(OH)
 
3
 · 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.10Manganoeudialyte
Na
 
14
Ca
 
6
Mn
 
3
Zr
 
3
[Si
 
26
O
 
72
(OH)
 
2
](H
 
2
O,Cl,O,OH)
 
6
9.CO.10UM1990-78-SiO:CaClFeHKNaZr
(H
 
3
O)
 
7
(Na,K)
 
5
(Ca,Sr,Mn)
 
6
Zr
 
3
[Si
 
3
O
 
7
(O,OH)
 
2
]
 
2
[Si
 
9
O
 
23
(O,OH)
 
4
]2[SiNaFe(Zr,Ti,Al,Nb)□]Cl
 
1.5
(O,OH)
9.CO.10UM-1990-79-SiO:CaClFeHMnNaNbREEZr
Na
 
14
Ca
 
5
(Mg,Ca,Mn)Zr
 
3
(Si
 
3
O
 
9
)
 
2
(Si
 
9
O
 
27
)
 
2
(Si,Nb,Al,Zr)
 
2
(Fe,Zr)
 
3
(Mn,Na,Ce,La,Y)(Na,H
 
2
O,K,Sr)(OH)
 
4-5
(OH,Cl)
9.CO.10UM1971-22-SiO:CaClFeHMgMnNaNbZr
Na
 
12
Ca
 
5
(Ce,La,Y,Ca)Zr
 
3
(Zr,Nb)(Fe,Mn)
 
3
[Si
 
9
O
 
24-26
(OH)
 
1-3
]
 
2
[Si
 
3
O
 
9
]
 
2
Cl
9.CO.10UM1998-21-SiO:CaCeClHMnNaZr
Na
 
16
Ca
 
6
(Mn,Ce)
 
3
Zr
 
3
(Si
 
3
O
 
9
)
 
2
(Si
 
9
O
 
27
)
 
2
(OH,Cl)
 
4
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

    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.
    Hide Locality List
    (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
      • Poços de Caldas plateau
    		Gunnar Farber
    Atencio et al.(2000) 4th international conference mineralogy and museuns, program and abstracts volume, p23.
    Canada
     
    • Québec
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		HORVÁTH, L. & PFENNINGER-HORVÁTH, E. (2000) I minerali di Mont-Saint-Hilaire (Québec, Canada) Rivista Mineralogica Italiana, XXIV, 140-202 (in Italian with English summary).
    Greenland
     
    • Tunu (East Greenland) Province
      • Kangerlussuaq Firth
        • Amdrup Firth
    		Eur. J. Mineral., 10, 207­-219.; Johnsen O, Grice J D, 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 10, 207-219
    Norway
     
    • Telemark
      • Porsgrunn
        • Mørje
          • Sagåsen
    		Larsen, A.O., Åsheim, A. and Gault, R. A. (2005): Minerals of the eudialyte group from the Sagåsen larvikite quarry, Porsgrunn, Norway. Norsk Bergverksmuseum Skrifter 30: 58-62 [listed i table 1]
    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
            • Alluaiv Mt
    		Pavel M. Kartashov data
    Pavel M. Kartashov data
    South Africa
     
    • North West Province
      • Western Bushveld Complex
        • Rustenburg District
    		R. Liferovich - L. Horváth p.c. (2004)
    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 Mts
    		Dr. W. Stoll (private communication 2001 & 2004)
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