Kentbrooksite

Kentbrooksite

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

Kentbrooksite

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

Kentbrooksite

Alluaiv Mt, Lovozero Massif, Murmansk Oblast, Russia

Kentbrooksite

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

Kentbrooksite

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

Kentbrooksite

Alluaiv Mt, Lovozero Massif, Murmansk Oblast, Russia

Kentbrooksite

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

Kentbrooksite

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

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, Denmark

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

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

ⓘ - 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 Mackenzie District 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).
Denmark (TL)
Greenland 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
Telemark Porsgrunn Mørje Sagåsen ⓘ Sagåsen Quarry (Saga 3 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 Island Água de Pau Massif ⓘ 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
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
Alluaiv Mt ⓘ Umbozero mine (Umbozerskii mine; Umba Mine)	Pavel M. Kartashov data
ⓘ Umbozero North quarry (Severnyi quarry)	Pavel M. Kartashov data
ⓘ Karnasurt Mt	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 Mt	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 Province Bojanala Platinum District Western Bushveld Complex ⓘ Pilanesberg Alkaline 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
Region of Republican Subordination Tien Shan Mtn Alai Range (Alayskiy) ⓘ Dara-i-Pioz Glacier (Dara-Pioz)	Lapis 29(1), 47 (2004); Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 132(6): 15-21 (in Russian).
USA
New Mexico Otero Co. Cornudas Mts ⓘ 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.