Kentbrooksite
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About Kentbrooksite
Formula:
(Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2O
Colour:
Yellow-brown
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
3.10
Crystal System:
Trigonal
Member of:
Name:
Named by O. Johnsen, J.D. Grice, and R.A. Gault in 1998 in honor of Charles Kent Brooks (1943-), professor at the Geological Institute, University of Copenhagen. He was the leader of fourteen geological expeditions to the Kangerdlugssuaq area of east Greenland and collected the type specimen.
Eudialyte Group. "Nb-REE-Mn-F" end member (Johnsen et al., 1998), but REE does not dominate at any structural site. Difference from eudialyte sensu stricto is mainly in (1) dominance of VMn at the M2 site, (2) VINb presence at the M3 site, (3) dominance of F, (4) high amount of REE.
Element combination of kentbrooksite is unique among approved mineral species.
Element combination of kentbrooksite is unique among approved mineral species.
Classification of Kentbrooksite
Approved
First published:
1998
8/E.23-20
9.CO.10
9 : SILICATES (Germanates)
C : Cyclosilicates
O : [Si9O27]18- 9-membered rings
9 : SILICATES (Germanates)
C : Cyclosilicates
O : [Si9O27]18- 9-membered rings
Dana 7th ed.:
64.1.1.3
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
64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
1 : Rings with Other Anions and Insular Silicate Groups with mixed ring types
Pronounciation of Kentbrooksite
Pronounciation:
Play | Recorded by | Country |
---|---|---|
Jolyon & Katya Ralph | United Kingdom |
Physical Properties of Kentbrooksite
Vitreous
Transparency:
Transparent
Colour:
Yellow-brown
Streak:
White
Hardness:
5 - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
No distinct cleavage reported.
No distinct cleavage reported.
Fracture:
Irregular/Uneven
Density:
3.10 g/cm3 (Measured) 3.08 g/cm3 (Calculated)
Optical Data of Kentbrooksite
Type:
Uniaxial (-)
RI values:
nω = 1.628 nε = 1.623
Max Birefringence:
δ = 0.005

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
Pleochroism:
Non-pleochroic
Chemical Properties of Kentbrooksite
Formula:
(Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2O
IMA Formula:
(Na,REE)15(Ca,REE)6Mn3Zr3Nb(Si25O73)(O,OH,H2O)3(F,Cl)2
Common Impurities:
REE,Y,K,Sr,Fe,Al,Ti,(Hf,Mg)
Crystallography of Kentbrooksite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 14.1686(2) Å, c = 30.0847((4) Å
Ratio:
a:c = 1 : 2.123
Unit Cell V:
5,230.34 ų (Calculated from Unit Cell)
Z:
3
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005609 | Kentbrooksite | Johnsen O, Grice J D (1999) The crystal chemistry of the eudialyte group The Canadian Mineralogist 37 865-891 | ![]() | 1999 | Mont Saint-Hilaire, Rouville County, Quebec, Canada | 0 | 293 |
0005610 | Kentbrooksite | Johnsen O, Grice J D (1999) The crystal chemistry of the eudialyte group The Canadian Mineralogist 37 865-891 | ![]() | 1999 | Mont Saint-Hilaire, Rouville County, Quebec, Canada | 0 | 293 |
0005619 | Kentbrooksite | Johnsen O, Grice J D (1999) The crystal chemistry of the eudialyte group The Canadian Mineralogist 37 865-891 | ![]() | 1999 | Amdrup Fjord, Kangerdlugssuaq intrusion, Eastern Greenland | 0 | 293 |
0005622 | Kentbrooksite | Johnsen O, Grice J D (1999) The crystal chemistry of the eudialyte group The Canadian Mineralogist 37 865-891 | ![]() | 1999 | Mont Saint-Hilaire, Rouville County, Quebec, Canada | 0 | 293 |
0005623 | Kentbrooksite | Johnsen O, Grice J D (1999) The crystal chemistry of the eudialyte group The Canadian Mineralogist 37 865-891 | ![]() | 1999 | Locality: Burpala massif, Siberia, Russia | 0 | 293 |
0006713 | Kentbrooksite | 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 | 1998 | Kangerdlugssuaq intrusion, East Greenland | 0 | 293 | |
0012363 | Kentbrooksite | Rastsvetaeva R K, Khomyakov A P, Nekrasov Y V (1999) Crystal structure of a novel analog of eudialyte with R3 symmetry Crystallography Reports 44 765-769 | 1999 | Alluaiv mountain, Lovozero massif, Kola Peninsula, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.839 Å | (100) |
2.961 Å | (91) |
11.385 Å | (43) |
7.088 Å | (41) |
3.380 Å | (37) |
4.295 Å | (34) |
5.682 Å | (30) |
Type Occurrence of Kentbrooksite
General Appearance of Type Material:
anhedral to subhedral aggregates
Reference:
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.
Synonyms of Kentbrooksite
Other Language Names for Kentbrooksite
Relationship of Kentbrooksite to other Species
Member of:
Other Members of this group:
Alluaivite | Na19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2O | Trig. 3m (3 2/m) : R3m |
Andrianovite | Na12(K,Sr,Ce)3Ca6Mn3Zr3Nb(Si25O73)(O,H2O,OH)5 | Trig. 3m : R3m |
Aqualite | (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl | Trig. 3 : R3 |
Carbokentbrooksite | (Na3Na3Na3Na3Na3)Ca6(VMn2+3)Zr3[Si3O9]2[Si9O27SiO][Si9O27Nb(OH)3](CO3)(H2O) | Trig. 3m : R3m |
Davinciite | Na12K3Ca6Fe2+3Zr3(Si26O73OH)Cl2 | Trig. 3m : R3m |
Dualite | Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3Mn[Si51O144](OH,H2O,Cl)9 | Trig. 3m : R3m |
Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 | Trig. 3m (3 2/m) : R3m |
Feklichevite | Na11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 | Trig. 3m : R3m |
Fengchengite | Na12◻3(Ca,Sr)6Fe3+3 Zr3Si(Si25O73)(H2O,OH)3(OH,Cl)2 | Trig. 3m (3 2/m) : R3m |
Ferrokentbrooksite | Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3Cl2 | Trig. 3m : R3m |
Georgbarsanovite | Na12(Mn,Sr,REE)3Ca6Fe2+3Zr3NbSi25O76Cl2 · H2O | Trig. 3m : R3m |
Golyshevite | Na10Ca3Ca6Zr3Fe2SiNb(Si3O9)2(Si9O27)2CO3(OH)3 · H2O | Trig. 3m : R3m |
Hydrorastsvetaevite | (Na11(H3O)11K6(H2O)1.5Sr)Ca12Fe3Na2MnZr6Si52O144(OH)4.5Cl3.5 | Trig. 3m : R3m |
Ikranite | (Na,H3O)15(Ca,Mn2+)6Fe3+2Zr3[H0-3Si3O9)2(Si9O27)2SiO]Cl · 2-3H2O | Trig. 3m : R3m |
Ilyukhinite | (H3O,Na)14Ca6Mn2Zr3Si26O72(OH)2 · 3H2O | Trig. 3m : R3m |
Johnsenite-(Ce) | Na12Ce3Ca6Mn3Zr3WSi25O73(CO3)(OH)2 | Trig. 3m : R3m |
Khomyakovite | Na12Sr3Ca6Fe3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2 | Trig. 3m : R3m |
Labyrinthite | (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3 | Trig. 3 : R3 |
Manganoeudialyte | Na14Ca6Mn3Zr3[Si26O72(OH)2](H2O,Cl,O,OH)6 | Trig. 3m : R3m |
Manganokhomyakovite | Na12Sr3Ca6Mn3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2 | Trig. 3m : R3m |
Mogovidite | Na9(Ca,Na)12Fe2Zr3Si25O72(CO3) (OH)4 | Trig. 3m : R3m |
Odikhinchaite | Na9Sr3[(H2O)2Na]Ca6Mn3Zr3NbSi (Si24O72)O(OH)3(CO3) · H2O | Trig. 3m : R3m |
Oneillite | Na15Ca3Mn3Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 | Trig. 3 : R3 |
Raslakite | Na15Ca3Fe2+3(Na,Zr)3Zr3(Si,Nb)[(Si3O9)2(Si9O27)2SiO](OH,H2O)3(Cl,OH) | Trig. 3 |
Rastsvetaevite | Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2 | Trig. 3m : R3m |
Sergevanite | Na15(Ca3Mn3)(Na2Fe)Zr3Si26O72(OH)3 · H2O | Trig. 3 : R3 |
Siudaite | Na8(Mn2+2Na)Ca6(Fe3+,Mn2+)3Zr3NbSi24(Si,◻,Ti)O74(OH)2Cl · 5H2O | Trig. 3m : R3m |
Taseqite | Na12Sr3Ca6Fe3Zr3Nb[(Si3O9)2(Si9O27)2SiO]Cl2(O,OH,H2O)3 | Trig. 3m : R3m |
UM1971-22-SiO:CaClFeHMgMnNaNbZr | Na12Ca5(Ce,La,Y,Ca)Zr3(Zr,Nb)(Fe,Mn)3[Si9O24-26(OH)1-3]2[Si3O9]2Cl | Trig. 3m : R3m |
UM1990-78-SiO:CaClFeHKNaZr | (H3O)7(Na,K)5(Ca,Sr,Mn)6Zr3[Si3O7(O,OH)2]2[Si9O23(O,OH)4]2[SiNaFe(Zr,Ti,Al,Nb)◻]Cl1.5(O,OH) | Trig. 3m : R3m |
UM1990-79-SiO:CaClFeHMnNaNbREEZr | Na14Ca5(Mg,Ca,Mn)Zr3(Si3O9)2(Si9O27)2(Si,Nb,Al,Zr)2(Fe,Zr)3(Mn,Na,Ce,La,Y)(Na,H2O,K,Sr)(OH)4-5(OH,Cl) | |
UM1990-80-SiO:CaFeHMnNaNbREEZr | Na14Ca4(Mn,Ca)2Zr3(Si3O9)2(Si9O27)2(Si,Nb,Al,Zr)2(Fe,Mn,Al,Ti)3(Na,Ce,La,Y,Mn)(Na,H2O,K,Sr)(OH)7-8 | |
UM1998-21-SiO:CaCeClHMnNaZr | Na16Ca6(Mn,Ce)3Zr3(Si3O9)2(Si9O27)2(OH,Cl)4 · nH2O | Trig. 3m : R3m |
UM1999-36-SiO:CaCeHMnNaNbSrZr | Na17(Ca,Ce,Sr)2Mn3(Zr,Nb)4Si25O73(O,OH,F,Cl)5 | Trig. 3 : R3 |
UM2000-66-SiO:CaClFeHMnNaNbSrZr | Na12(Ca,Mn)6(Sr,Na,K)3(Fe,Mn)3(Zr,Nb)4Si25O66(OH,Cl)11 | Trig. 3m : R3m |
UM2000-67-SiO:CaClFeHMnNaNbZr | Zr4(Ca,Na,Mn,Fe)6(Fe,Mn,Ti)3Na17Si25O75(Al,Nb,Ti)Cl(OH)4.H2O | Trig. 3m : R3m |
UM2000-80- SiO:CaCeFFeHMnNaNbTiZr | Na14(Na,Ca,Ce)(Mn,Ca,Ce)[Fe1.55(Zr,Na)(◻,Ti,Nb)]Zr3(Si,Al)(Si3O9)2(Si9O27)2(OH,O)4(F ,Cl) · H2O | |
UM2003-39-SiO:CaClFeHHfNaNbSrTaTiZr | Na12(Na,K,Mn,Sr)2Ca5(Ca,Mn)(Zr,Hf)3(Fe,◻,Ta)3(Si,Nb,W)(Si,Al,Ti)Si24O72(OH,O)3.5Cl · 1.2H2O | Trig. 3m : R3m |
UM2004-51-SiO:CaClFFeHNaNbTi | Na16Ca6(Fe,Mn)3Zr3(Ti,Nb)Si26O72FCl0.5 · nH2O | Trig. 3m : R3m |
UM2005-36-SiO:AlBaCaClFeHKMnNaREESrTiZr | [(H3O)9.32Na5.86K0.53Ba0.36Sr0.15][Ca5.22Sr0.49Ce0.16Mn0.13][Zr2.42Ti0.54Hf0.02Nb0.02][Na1.48(Fe | |
UM2005-37-SiO:AlBaCaClFeHKMnNaREESrTiZr | [(H3O)9.26Na2.12K1.20Ba0.46Sr0.48][Ca5.76Ce0.24][Zr2.92Ti0.08][Na0.62(Fe0.23Mn0.11(H2O)0.34)][Si | |
UM2005-38-SiO:AlBaCaClFeHKMnNaNbREESrTiYZr | [(H3O)10.85Na3.3Sr0.48K0.21Ce0.2Y0.1Ba0.04][Ca2.10Na0.9][Ca2.4Na0.3Mn0.3][Zr2.97Hf0.03][Fe1.32 | |
UM2005-39-SiO:AlBaCaClFeHKMnNaNbREESrTiYZr | [(H3O)11.61Na3.0Sr0.63Ce0.22K0.2Y0.05Ba0.03][Ca2.25Na0.75][Ca2.4Mn0.6][Zr2.98Hf0.02][Fe3+0.66 | |
UM2005-40-SiO:AlCaClFeHKMnNaNbREESrTiYZr | [(H3O)5.58Na5.25Ce0.63K0.3Y0.19Sr0.05][Ca3][Ca1.71Mn1.29][Zr2.96Hf0.04][(Fe3+1.0Fe2+0.35)(Fe3+ | |
UM2005-41-SiO:BaCaFeHKMgMnNaNbREESrTiYZr | [(H3O)8.53Na3.51Sr0.55Ce0.45Y0.3Ba0.15K0.06][Ca2.25Sr0.45Na0.3][Ca2.4Mn0.6][Zr2.97Hf0.03][(Mn0. | |
UM2006-17-SiO:CaClFFeHMnNaZr | Na15(Ca3Mn3)Zr3(Fe,Zr)3SiSi(Si3O9)2(Si9O27)2O2(OH,F,Cl)3 · 2H2O | |
UM2006-18-SiO:CaClFFeHMnNaZr | Na15Ca3(Mn,Fe)3Zr3(Zr,Na)3(Si,Nb)(S,Ti,Si)(Si3O9)2(Si9O27)2(O,OH)5(Cl,F,H2O) | Trig. 3 : R3 |
UM2006-28-SiO:CaHMnNaZr | Na33Ca12Zr6Mn3(Mn,Nb,Ti)2Si50O132(O,OH)12(OH,H2O,Cl)10 | |
UM2010-06-SiO:CaFeHMnNaNbREETiZr | [Na,(H3O)]15(Ca3Mn3)Na3Zr3(Si,Ti)[Si25O72OH](OH)2 · 2H2O | |
Unnamed (Eudialyte 3248) | Na29Ca12Zr6[Si48O132(O,OH)12]{[Na]4[Si]2}{[Mn]3[Mn,Nb,Ti]2}(OH,H2O,Cl)10 | Trig. 3m (3 2/m) : R3m |
Unnamed (Hydrated Hydrous Na-Ca-Mn-Fe-Zr-Ti Silicate Chloride) | Na37Ca10Mn2FeZr6Si50(Ti,Nb)2O144(OH)5Cl3 · H2O | Trig. 3m : R3m |
Unnamed (M4-vacant Sodium Calcium Manganese Zirconium Iron Silicon Hydroxyl Hydrated Eudialyte Group Species) | Na13(Ca3Mn3)Zr3(Fe, Mn)3(◻)(Si)[Si3O9]2[Si9O27]2(O,OH,Cl)3 · 2H2O | |
Voronkovite | Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl · H2O | Trig. 3 : R3 |
Zirsilite-(Ce) | Na11-12(Ce,Na)3Ca6Mn3Zr3Nb(Si19O55)(Si3O9)2(CO3)(OH)3 · H2O | Trig. 3m : R3m |
Common Associates
Associated Minerals Based on Photo Data:
5 photos of Kentbrooksite associated with Aegirine | NaFe3+Si2O6 |
3 photos of Kentbrooksite associated with Parakeldyshite | Na2ZrSi2O7 |
3 photos of Kentbrooksite associated with Tsepinite-Ca | Ca(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O |
3 photos of Kentbrooksite associated with Pyatenkoite-(Y) | Na5YTi[SiO3]6 · 6H2O |
2 photos of Kentbrooksite associated with Petarasite | Na5Zr2(Si6O18)(Cl,OH) · 2H2O |
2 photos of Kentbrooksite associated with Catapleiite | Na2Zr(Si3O9) · 2H2O |
2 photos of Kentbrooksite associated with Analcime | Na(AlSi2O6) · H2O |
2 photos of Kentbrooksite associated with Lorenzenite | Na2Ti2(Si2O6)O3 |
1 photo of Kentbrooksite associated with Orthoclase | K(AlSi3O8) |
1 photo of Kentbrooksite associated with Loparite-(Ce) | (Na,REE)2Ti2O6 |
Related Minerals - Nickel-Strunz Grouping
9.CO.10 | Alluaivite | Na19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2O | Trig. 3m (3 2/m) : R3m |
9.CO.10 | Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 | Trig. 3m (3 2/m) : R3m |
9.CO.10 | Ferrokentbrooksite | Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3Cl2 | Trig. 3m : R3m |
9.CO.10 | Khomyakovite | Na12Sr3Ca6Fe3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2 | Trig. 3m : R3m |
9.CO.10 | Manganokhomyakovite | Na12Sr3Ca6Mn3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2 | Trig. 3m : R3m |
9.CO.10 | Oneillite | Na15Ca3Mn3Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 | Trig. 3 : R3 |
9.CO.10 | Raslakite | Na15Ca3Fe2+3(Na,Zr)3Zr3(Si,Nb)[(Si3O9)2(Si9O27)2SiO](OH,H2O)3(Cl,OH) | Trig. 3 |
9.CO.10 | Feklichevite | Na11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 | Trig. 3m : R3m |
9.CO.10 | Carbokentbrooksite | (Na3Na3Na3Na3Na3)Ca6(VMn2+3)Zr3[Si3O9]2[Si9O27SiO][Si9O27Nb(OH)3](CO3)(H2O) | Trig. 3m : R3m |
9.CO.10 | Zirsilite-(Ce) | Na11-12(Ce,Na)3Ca6Mn3Zr3Nb(Si19O55)(Si3O9)2(CO3)(OH)3 · H2O | Trig. 3m : R3m |
9.CO.10 | Ikranite | (Na,H3O)15(Ca,Mn2+)6Fe3+2Zr3[H0-3Si3O9)2(Si9O27)2SiO]Cl · 2-3H2O | Trig. 3m : R3m |
9.CO.10 | Taseqite | Na12Sr3Ca6Fe3Zr3Nb[(Si3O9)2(Si9O27)2SiO]Cl2(O,OH,H2O)3 | Trig. 3m : R3m |
9.CO.10 | Rastsvetaevite | Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2 | Trig. 3m : R3m |
9.CO.10 | Golyshevite | Na10Ca3Ca6Zr3Fe2SiNb(Si3O9)2(Si9O27)2CO3(OH)3 · H2O | Trig. 3m : R3m |
9.CO.10 | Labyrinthite | (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3 | Trig. 3 : R3 |
9.CO.10 | Johnsenite-(Ce) | Na12Ce3Ca6Mn3Zr3WSi25O73(CO3)(OH)2 | Trig. 3m : R3m |
9.CO.10 | Mogovidite | Na9(Ca,Na)12Fe2Zr3Si25O72(CO3) (OH)4 | Trig. 3m : R3m |
9.CO.10 | Georgbarsanovite | Na12(Mn,Sr,REE)3Ca6Fe2+3Zr3NbSi25O76Cl2 · H2O | Trig. 3m : R3m |
9.CO.10 | Aqualite | (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl | Trig. 3 : R3 |
9.CO.10 | Dualite | Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3Mn[Si51O144](OH,H2O,Cl)9 | Trig. 3m : R3m |
9.CO.10 | Andrianovite | Na12(K,Sr,Ce)3Ca6Mn3Zr3Nb(Si25O73)(O,H2O,OH)5 | Trig. 3m : R3m |
9.CO.10 | Voronkovite | Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl · H2O | Trig. 3 : R3 |
9.CO.10 | UM1999-36-SiO:CaCeHMnNaNbSrZr | Na17(Ca,Ce,Sr)2Mn3(Zr,Nb)4Si25O73(O,OH,F,Cl)5 | Trig. 3 : R3 |
9.CO.10 | UM2000-66-SiO:CaClFeHMnNaNbSrZr | Na12(Ca,Mn)6(Sr,Na,K)3(Fe,Mn)3(Zr,Nb)4Si25O66(OH,Cl)11 | Trig. 3m : R3m |
9.CO.10 | Manganoeudialyte | Na14Ca6Mn3Zr3[Si26O72(OH)2](H2O,Cl,O,OH)6 | Trig. 3m : R3m |
9.CO.10 | UM1990-78-SiO:CaClFeHKNaZr | (H3O)7(Na,K)5(Ca,Sr,Mn)6Zr3[Si3O7(O,OH)2]2[Si9O23(O,OH)4]2[SiNaFe(Zr,Ti,Al,Nb)◻]Cl1.5(O,OH) | Trig. 3m : R3m |
9.CO.10 | UM1990-79-SiO:CaClFeHMnNaNbREEZr | Na14Ca5(Mg,Ca,Mn)Zr3(Si3O9)2(Si9O27)2(Si,Nb,Al,Zr)2(Fe,Zr)3(Mn,Na,Ce,La,Y)(Na,H2O,K,Sr)(OH)4-5(OH,Cl) | |
9.CO.10 | UM1971-22-SiO:CaClFeHMgMnNaNbZr | Na12Ca5(Ce,La,Y,Ca)Zr3(Zr,Nb)(Fe,Mn)3[Si9O24-26(OH)1-3]2[Si3O9]2Cl | Trig. 3m : R3m |
9.CO.10 | UM1998-21-SiO:CaCeClHMnNaZr | Na16Ca6(Mn,Ce)3Zr3(Si3O9)2(Si9O27)2(OH,Cl)4 · nH2O | Trig. 3m : R3m |
Related Minerals - Dana Grouping (8th Ed.)
64.1.2.2 | Ferrokentbrooksite | Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3Cl2 | Trig. 3m : R3m |
64.1.2.3 | Carbokentbrooksite | (Na3Na3Na3Na3Na3)Ca6(VMn2+3)Zr3[Si3O9]2[Si9O27SiO][Si9O27Nb(OH)3](CO3)(H2O) | Trig. 3m : R3m |
64.1.2.4 | Andrianovite | Na12(K,Sr,Ce)3Ca6Mn3Zr3Nb(Si25O73)(O,H2O,OH)5 | Trig. 3m : R3m |
64.1.2.5 | Khomyakovite | Na12Sr3Ca6Fe3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2 | Trig. 3m : R3m |
64.1.2.6 | Manganokhomyakovite | Na12Sr3Ca6Mn3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2 | Trig. 3m : R3m |
64.1.2.7 | Johnsenite-(Ce) | Na12Ce3Ca6Mn3Zr3WSi25O73(CO3)(OH)2 | Trig. 3m : R3m |
64.1.2.8 | Georgbarsanovite | Na12(Mn,Sr,REE)3Ca6Fe2+3Zr3NbSi25O76Cl2 · H2O | Trig. 3m : R3m |
Other Information
Electrical:
Pyroelectric.
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 Kentbrooksite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Jambor, J.L., Roberts, A.C. (1999) New mineral names. American Mineralogist: 84: 193-198.
Rastsvetaeva, R.K., Khomyakov, A.P., Nekrasov, Y.V. (1999) Crystal structure of a novel analog of eudialyte with R3 symmetry. Crystallography Reports: 44: 765-769.
Ekimenkova, I.A., Rastsvetaeva, R.K., Khomyakov, A.P. (2000) Crystal structure of the Fe,Cl-analogue of kentbrooksite. Doklady Chemistry: 370: 17-20.
Jambor, J.L., Roberts, A.C. (2001) New mineral names. American Mineralogist: 86: 939-942.
Johnsen, O., Ferraris, G., Gault, R.A., Grice, J.D., Kampf, A.R., Pekov, I.V. (2003) The nomenclature of eudialyte-group minerals. The Canadian Mineralogist: 41: 785-794.
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.
Rastsvetaeva, R.K., Chukanov, N.V. (2012) Classification of eudialyte-group minerals. Geology of Ore Deposits: 54: 487-497.
Internet Links for Kentbrooksite
mindat.org URL:
https://www.mindat.org/min-7132.html
Please feel free to link to this page.
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External Links:
Mineral Dealers:
Localities for Kentbrooksite
Locality List




All localities listed without proper references should be considered as questionable.
Brazil | |
| Atencio et al.(2000) 4th international conference mineralogy and museuns, program and abstracts volume, p23. |
Gunnar Färber | |
Vik Vanrusselt collection (specimen acquired from Zelimir Gabelica) | |
Canada | |
| MÖLLER, V. (2016) The Nature and origin of the Nechalacho Rare Metal Deposit (REE, Nb, Zr), Northwest Territories, Canada. Unpublished Ph.D. thesis, McGill University, Montreal. 409 p. |
| 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 (TL) | |
| 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 |
Distribution and mineralogy of rare earth element–Zr–Nb–Ta mineralisation within pegmatite sheets at Citadellet, Kangerdlugssuaq alkaline intrusion, East Greenland. in Abdurrahman, A., J. C. Ø. Andersen, and B. J. Williamson. "Meeting of the Geological Society’s Mineral Deposits Studies Group was held on the 2nd–4th January 2013 at the University of Leicester, UK." Applied Earth Science (Trans. Inst. Min. Metall. B) 121.4 (2012): 212. | |
Norway | |
| 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]; Andersen, T., Erambert, M., Larsen, A.O. & Selbekk, R.S. (2012): Petrology of nepheline syenite pegmatites in the Oslo Rift, Norway: Zr and Ti mineral assemblages in miaskitic and agpaitic pegmatites in the Larvik Plutonic Complex. Mineralogia Polonica. 43(2), 3- 34 |
Portugal | |
| Samples collected by Luigi Chiappino and analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA; Lavarde, S., Chiappino, L., Alves, P., Astolfi, M., (2019) Les Minéraux du massif volcanique du Fogo, Ile de São Miguel, Açores, Portugal. Le Règne Mineral, 145, 30-50 |
Russia | |
| PEKOV, I.V. & NIKOLAEV, A.P. (2013) Minerals of the pegmatites and hydrothermal assemblages of the Koashva deposit (Khibiny, Kola Peninsula, Russia). Mineralogical Almanac 189(2), 7-65. |
| Pavel M. Kartashov data |
http://maurice.strahlen.org/minerals/kentbrooksite.htm | |
| Neues Jahrbuch für Mineralogie, Monatshefte (2003): 10: 461-480. |
www.koeln.netsurf.de/~w.steffens/lovo.htm | |
| Pavel M. Kartashov data |
Pavel M. Kartashov data | |
Ivanyuk, G. Y., Pakhomovsky, Y. A., & Yakovenchuk, V. N. (2015). Eudialyte-group minerals in rocks of Lovozero layered complex at Mt. Karnasurt and Mt. Kedykvyrpakhk. Geology of Ore Deposits, 57(7), 600-613. | |
Ivanyuk, G. Y., Pakhomovsky, Y. A., & Yakovenchuk, V. N. (2015). Eudialyte-group minerals in rocks of Lovozero layered complex at Mt. Karnasurt and Mt. Kedykvyrpakhk. Geology of Ore Deposits, 57(7), 600-613. | |
South Africa | |
| R. Liferovich - L. Horváth p.c. (2004); Mitchell, R. H., & Liferovich, R. P. (2006). Subsolidus deuteric/hydrothermal alteration of eudialyte in lujavrite from the Pilansberg alkaline complex, South Africa. Lithos, 91(1), 352-372. |
Spain | |
| "Christof Schäfer" |
Tajikistan | |
| Belakowski, D.I. (1991) Die seltenen Mineralien von Dara-i-Pioz im Hochgebirge Tadshikistans. Lapis: 16(12): 42-48.; Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 132(6): 15-21 (in Russian). |
USA | |
| Dr. W. Stoll (private communication 2001 & 2004) |
| Falster, A.U., T.W. Buchholz, W.B. Simmons, J.D. Guidry & C.M. Johnson (2014), A New Find of Complex Na-Zr Silicates in the Stettin Complex, Marathon County, Wisconsin, a presentation before ther 41st. Rochester Mineralogical Symposium, April 25, 2014. |
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Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada