Kentbrooksite

Kentbrooksite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Kentbrooksite, etc.

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Kentbrooksite

Lovchorrite Mine, Hackman Valley, Yukspor Mt, Khibiny Massif, Murmansk Oblast, Russia

Kentbrooksite, etc.

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Kentbrooksite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Kentbrooksite, etc.

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Kentbrooksite

Lovchorrite Mine, Hackman Valley, Yukspor Mt, Khibiny Massif, Murmansk Oblast, Russia

Kentbrooksite, etc.

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Kentbrooksite

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Kentbrooksite, etc.

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

About KentbrooksiteHide

C. Kent Brooks

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:

Eudialyte Group

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.

Type Locality:

ⓘ Kentbrooksite occurrence, Amdrup Firth, Kangerlussuaq Fjord, Sermersooq, Greenland

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.

Classification of KentbrooksiteHide

Pronounciation of KentbrooksiteHide

Physical Properties of KentbrooksiteHide

Optical Data of KentbrooksiteHide

Type:

Uniaxial (-)

RI values:

n_ω = 1.628 n_ε = 1.623

Max Birefringence:

δ = 0.005

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Surface Relief:

Moderate

Pleochroism:

Non-pleochroic

Chemical Properties of KentbrooksiteHide

Crystallography of KentbrooksiteHide

Crystal StructureHide

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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 closedata_global _chemical_name_mineral 'Kentbrooksite' loop_ _publ_author_name 'Johnsen O' 'Grice J D' _journal_name_full 'The Canadian Mineralogist' _journal_volume 37 _journal_year 1999 _journal_page_first 865 _journal_page_last 891 _publ_section_title ; The crystal chemistry of the eudialyte group Sample: #3 Note: additional sites with low but unreported occupancies excluded ; _database_code_amcsd 0005609 _chemical_compound_source 'Mont Saint-Hilaire, Rouville County, Quebec, Canada' _chemical_formula_sum 'Ca4.8 Mn2.34 Y.18 Ce.75 La.51 Fe1.47 Nb.78 Ta.07 Si24.93 Na13.08 Nd.15 K.24 Sr.06 Zr3 O76.47 Cl1.08 H.93' _cell_length_a 14.2602 _cell_length_b 14.2602 _cell_length_c 29.980 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 5279.750 _exptl_crystal_density_diffrn 3.070 _symmetry_space_group_name_H-M 'R 3 m' loop_ _space_group_symop_operation_xyz 'x,y,z' '2/3+x,1/3+y,1/3+z' '1/3+x,2/3+y,2/3+z' 'x,x-y,z' '2/3+x,1/3+x-y,1/3+z' '1/3+x,2/3+x-y,2/3+z' '-y,-x,z' '2/3-y,1/3-x,1/3+z' '1/3-y,2/3-x,2/3+z' '-x+y,y,z' '2/3-x+y,1/3+y,1/3+z' '1/3-x+y,2/3+y,2/3+z' '-y,x-y,z' '2/3-y,1/3+x-y,1/3+z' '1/3-y,2/3+x-y,2/3+z' '-x+y,-x,z' '2/3-x+y,1/3-x,1/3+z' '1/3-x+y,2/3-x,2/3+z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv CaM1 0.40560 0.07450 0.83250 0.80000 0.01500 MnM1 0.40560 0.07450 0.83250 0.15000 0.01500 YM1 0.40560 0.07450 0.83250 0.03000 0.01500 CeM1 0.40560 0.07450 0.83250 0.01000 0.01500 LaM1 0.40560 0.07450 0.83250 0.01000 0.01500 MnM25 0.18290 0.81710 0.82950 0.48000 0.01500 FeM25 0.18290 0.81710 0.82950 0.26000 0.01500 FeM24 0.17070 0.82930 0.83540 0.23000 0.03000 NbM3 0.00000 0.00000 0.12970 0.78000 0.01500 TaM3 0.00000 0.00000 0.12970 0.07000 0.01500 Si7 0.00000 0.00000 0.92080 0.84000 0.01000 Si7a 0.00000 0.00000 0.87980 0.09000 0.03000 Na1a 0.74820 0.25180 0.00340 0.46000 0.03500 Na1b 0.77610 0.22390 0.98610 0.46000 0.03500 Na2 0.56180 0.43820 0.67540 1.00000 0.02500 NaNa3a -0.10380 0.10380 0.78610 0.97000 0.07500 CeNa3a -0.10380 0.10380 0.78610 0.03000 0.07500 Na4 0.43440 0.56560 0.88090 0.50000 0.01500 CeNa4 0.43440 0.56560 0.88090 0.20000 0.01500 LaNa4 0.43440 0.56560 0.88090 0.15000 0.01500 NdNa4 0.43440 0.56560 0.88090 0.05000 0.01500 KNa4 0.43440 0.56560 0.88090 0.08000 0.01500 SrNa4 0.43440 0.56560 0.88090 0.02000 0.01500 Na5 0.26100 0.73900 0.68490 0.97000 0.06500 Zr 0.50340 0.49660 0.00000 1.00000 0.01000 Si1 0.73710 0.26290 0.74980 1.00000 0.01500 Si2 0.59680 0.40320 0.91320 1.00000 0.01500 Si3 0.45990 0.54010 0.75570 1.00000 0.01000 Si4 0.87700 0.12300 0.90710 1.00000 0.01000 Si5 0.05590 0.32550 0.73680 1.00000 0.01000 Si6 0.27590 -0.06240 0.93040 1.00000 0.01000 O1 0.60530 0.39470 0.75280 1.00000 0.02500 O2 0.77850 0.22150 0.78960 1.00000 0.03500 O3 0.76470 0.23530 0.70170 1.00000 0.03500 O4 0.72840 0.27160 0.90620 1.00000 0.03000 O5 0.54970 0.45030 0.87670 1.00000 0.03500 O6 0.90980 0.09020 0.63110 1.00000 0.03000 O7 0.39020 -0.03770 0.72630 1.00000 0.01500 O8 0.48360 0.51640 0.80500 1.00000 0.01500 O9 0.39550 0.60450 0.75110 1.00000 0.02500 O10 0.27670 0.05070 0.93970 1.00000 0.02500 O11 0.84520 0.15480 0.86120 1.00000 0.02000 O12 0.94060 0.05940 0.89820 1.00000 0.03500 O13 0.70250 0.09930 0.62570 1.00000 0.02000 O14 0.29350 0.92360 0.87830 1.00000 0.01500 O15 0.15980 0.84020 0.94850 1.00000 0.01500 O16 0.25160 0.22550 0.70680 1.00000 0.02000 O17 0.04360 0.29950 0.78910 1.00000 0.01500 O18 0.18020 0.81980 0.72060 1.00000 0.01500 O19 0.26930 0.73070 0.83090 0.90000 0.02000 O20 0.00000 0.00000 0.97380 0.84000 0.02000 ClX1a 0.00000 0.00000 0.26490 0.36000 0.03000 O-HX1a 0.00000 0.00000 0.26490 0.14000 0.03000 ClX1b 0.94860 0.89730 0.26130 0.12000 0.03000 O-HX1b 0.94860 0.89730 0.26130 0.05000 0.03000 ClX2a 0.00000 0.00000 0.75110 0.18000 0.03000 O-HX2a 0.00000 0.00000 0.75110 0.32000 0.03000 ClX2b 0.00000 0.00000 0.71040 0.18000 0.03000 O-HX2b 0.00000 0.00000 0.71040 0.32000 0.03000

X-Ray Powder DiffractionHide

Type Occurrence of KentbrooksiteHide

Synonyms of KentbrooksiteHide

Other Language Names for KentbrooksiteHide

Relationship of Kentbrooksite to other SpeciesHide

Common AssociatesHide

Related Minerals - Nickel-Strunz GroupingHide

Related Minerals - Dana Grouping (8th Ed.)Hide

Other InformationHide

References for KentbrooksiteHide

Internet Links for KentbrooksiteHide

Localities for KentbrooksiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.

Brazil
Minas Gerais ⓘ Poços de Caldas alkaline complex	Atencio et al.(2000) 4th international conference mineralogy and museuns, program and abstracts volume, p23.
ⓘ Poços de Caldas	Gunnar Färber
ⓘ Bortolan quarry	Vik Vanrusselt collection (specimen acquired from Zelimir Gabelica)
Canada
Northwest Territories Blachford Lake alkaline complex Thor Lake syenite complex ⓘ Nechalacho deposit	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.
Québec Montérégie La Vallée-du-Richelieu RCM Mont Saint-Hilaire ⓘ Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH)	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)
Sermersooq Kangerlussuaq Fjord Amdrup Firth ⓘ Kentbrooksite occurrence (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
ⓘ Citadellet	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
Vestfold og Telemark Porsgrunn Auenlandet Sagåsen ⓘ Sagåsen Quarry ?	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
Azores São Miguel ⓘ Água de Pau Volcano (Fogo Volcano)	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
Murmansk Oblast Khibiny Massif ⓘ Koashva Mt	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.
Kukisvumchorr Mt East slope Tuliok River head ⓘ Unnamed pegmatite	Pavel M. Kartashov data
ⓘ Rischorr Mt	http://maurice.strahlen.org/minerals/kentbrooksite.htm
ⓘ Yukspor Mt
Hackman Valley ⓘ Lovchorrite Mine	Neues Jahrbuch für Mineralogie, Monatshefte (2003): 10: 461-480.
ⓘ Lovozero Massif	www.koeln.netsurf.de/~w.steffens/lovo.htm
Lovozersky District Alluaiv Mountain ⓘ Umbozero mine (Umbozerskii mine; Umba Mine)	Pavel M. Kartashov data
ⓘ Umbozero North quarry (Severnyi quarry)	Pavel M. Kartashov data
ⓘ Karnasurt Mountain	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.
ⓘ Kedykverpakhk Mountain	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
North West Bojanala Platinum District Municipality ⓘ Pilanesberg Alkaline Ring Complex	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
Canary Islands Santa Cruz de Tenerife Province Tenerife ⓘ Sanidinite occurrence	"Christof Schäfer"
Tajikistan
Districts of Republican Subordination ⓘ Dara-i-Pioz Glacier (Dara-Pioz)	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
New Mexico Otero Co. Cornudas Mountains ⓘ Wind Mountain	Dr. W. Stoll (private communication 2001 & 2004)
Wisconsin Marathon Co. Wausau Intrusive Complex ⓘ Stettin pluton	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.