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About KentbrooksiteHide

C. Kent Brooks
(Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2O
5 - 6
Specific Gravity:
Crystal System:
Member of:
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.

Classification of KentbrooksiteHide

First Published:

9 : SILICATES (Germanates)
C : Cyclosilicates
O : [Si9O27]18- 9-membered rings
Dana 7th ed.:

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 KentbrooksiteHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of KentbrooksiteHide

5 - 6 on Mohs scale
None Observed
No distinct cleavage reported.
3.10 g/cm3 (Measured)    3.08 g/cm3 (Calculated)

Optical Data of KentbrooksiteHide

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.
Surface Relief:

Chemical Properties of KentbrooksiteHide

(Na,REE)15(Ca,REE)6(Mn2+,Fe2+)3Zr3Nb[Si25O74]F2 · 2H2O
IMA Formula:
Common Impurities:

Crystallography of KentbrooksiteHide

Crystal System:
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
Cell Parameters:
a = 14.1686(2) Å, c = 30.0847((4) Å
a:c = 1 : 2.123
Unit Cell V:
5,230.34 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
2.839 (100)
2.961 (91)
11.385 (43)
7.088 (41)
3.380 (37)
4.295 (34)
5.682 (30)

Type Occurrence of KentbrooksiteHide

General Appearance of Type Material:
anhedral to subhedral aggregates
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 KentbrooksiteHide

Other Language Names for KentbrooksiteHide

Relationship of Kentbrooksite to other SpeciesHide

Member of:
Other Members of this group:
AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2OTrig. 3m (3 2/m) : R3m
AndrianoviteNa12(K,Sr,Ce)3Ca6Mn3Zr3Nb(Si25O73)(O,H2O,OH)5Trig. 3m : R3m
Aqualite(H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9ClTrig. 3 : R3
CarbokentbrooksiteNa11-12(Na,Ce)3Ca6Mn3Zr3Nb[(OH)3|CO3|(Si3O9)2|(Si9O27)2SiO] · H2OTrig. 3m : R3m
DavinciiteNa12K3Ca6Fe2+3Zr3(Si26O73OH)Cl2 Trig. 3m : R3m
DualiteNa30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3Mn[Si51O144](OH,H2O,Cl)9Trig. 3m : R3m
EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m (3 2/m) : R3m
FeklicheviteNa11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5Trig. 3m : R3m
FengchengiteNa123(Ca,Sr)6Fe3+3 Zr3Si(Si25O73)(H2O,OH)3(OH,Cl)2Trig. 3m (3 2/m) : R3m
FerrokentbrooksiteNa15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3Cl2Trig. 3m : R3m
GeorgbarsanoviteNa12(Mn,Sr,REE)3Ca6Fe2+3Zr3NbSi25O76Cl2·H2OTrig. 3m : R3m
GolysheviteNa10Ca3Ca6Zr3Fe2SiNb(Si3O9)2(Si9O27)2CO3(OH)3 · H2OTrig. 3m : R3m
Hydrorastsvetaevite(Na11(H3O)11K6(H2O)1.5Sr)Ca12Fe3Na2MnZr6Si52O144(OH)4.5Cl3.5Trig. 3m : R3m
Ikranite(Na,H3O)15(Ca,Mn2+)6Fe3+2Zr3-4[Cl|(H0-3Si3O9)2|{(Si9O27)2,(Si9O27)2SiO}] · 2-3H2OTrig. 3m : R3m
Ilyukhinite(H3O,Na)14Ca6Mn2Zr3Si26O72(OH)2·3H2OTrig. 3m : R3m
Johnsenite-(Ce)Na12Ce3Ca6Mn3Zr3WSi25O73(CO3)(OH)2Trig. 3m : R3m
KhomyakoviteNa12Sr3Ca6Fe3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m : R3m
Labyrinthite(Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3Trig. 3 : R3
ManganoeudialyteNa14Ca6Mn3Zr3[Si26O72(OH)2](H2O,Cl,O,OH)6Trig. 3m : R3m
ManganokhomyakoviteNa12Sr3Ca6Mn3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m : R3m
MogoviditeNa9(Ca,Na)12Fe2Zr3Si25O72(CO3) (OH)4Trig. 3m : R3m
OneilliteNa15Ca3Mn3Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2Trig. 3 : R3
RaslakiteNa15Ca3Fe2+3(Na,Zr)3Zr3Nb<0.5[(Cl,OH)|(Si3O9)2|(Si9O27)2SiO] · 3(OH,H2O)Trig. 3
RastsvetaeviteNa27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2Trig. 3m : R3m
SiudaiteNa8(Mn2+2Na)Ca6(Fe3+,Mn2+)3Zr3NbSi24(Si,◻,Ti)O74(OH)2Cl·5H2OTrig. 3m : R3m
TaseqiteNa12Sr3Ca6Fe3Zr3Nb[Cl2|(Si3O9)2|(Si9O27)2SiO] · 3(O,OH,H2O)Trig. 3m : R3m
UM1971-22-SiO:CaClFeHMgMnNaNbZrNa12Ca5(Ce,La,Y,Ca)Zr3(Zr,Nb)(Fe,Mn)3[Si9O24-26(OH)1-3]2[Si3O9]2ClTrig. 3m : R3m
UM1998-21-SiO:CaCeClHMnNaZrNa16Ca6(Mn,Ce)3Zr3(Si3O9)2(Si9O27)2(OH,Cl)4Trig. 3m : R3m
UM1999-36-SiO:CaCeHMnNaNbSrZrNa17(Ca,Ce,Sr)2Mn3(Zr,Nb)4Si25O73(O,OH,F,Cl)5Trig. 3 : R3
UM2000-66-SiO:CaClFeHMnNaNbSrZrNa12(Ca,Mn)6(Sr,Na,K)3(Fe,Mn)3(Zr,Nb)4Si25O66(OH,Cl)11Trig. 3m : R3m
UM2004-51-SiO:CaClFFeHNaNbTiNa16Ca6(Fe,Mn)3Zr3(Ti,Nb)Si26O72FCl0.5•nH2OTrig. 3m : R3m
Unnamed (Eudialyte 3248)Na29Ca12Zr6[Si48O132(O,OH)12]{[Na]4[Si]2}{[Mn]3[Mn,Nb,Ti]2}(OH,H2O,Cl)10Trig. 3m (3 2/m) : R3m
Unnamed (Hydrated Hydrous Na-Ca-Mn-Fe-Zr-Ti Silicate Chloride)Na37Ca10Mn2FeZr6Si50(Ti,Nb)2O144(OH)5Cl3·H2OTrig. 3m : R3m
VoronkoviteNa15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl · H2OTrig. 3 : R3
Zirsilite-(Ce)Na11-12(Ce,Na)3Ca6Mn3Zr3Nb(Si19O55)(Si3O9)2(CO3)(OH)3 · H2OTrig. 3m : R3m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Aegirine5 photos of Kentbrooksite associated with Aegirine on mindat.org.
Parakeldyshite3 photos of Kentbrooksite associated with Parakeldyshite on mindat.org.
Tsepinite-Ca3 photos of Kentbrooksite associated with Tsepinite-Ca on mindat.org.
Pyatenkoite-(Y)3 photos of Kentbrooksite associated with Pyatenkoite-(Y) on mindat.org.
Petarasite2 photos of Kentbrooksite associated with Petarasite on mindat.org.
Catapleiite2 photos of Kentbrooksite associated with Catapleiite on mindat.org.
Analcime2 photos of Kentbrooksite associated with Analcime on mindat.org.
Lorenzenite2 photos of Kentbrooksite associated with Lorenzenite on mindat.org.
Orthoclase1 photo of Kentbrooksite associated with Orthoclase on mindat.org.
Loparite-(Ce)1 photo of Kentbrooksite associated with Loparite-(Ce) on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.CO.10AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2OTrig. 3m (3 2/m) : R3m
9.CO.10EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m (3 2/m) : R3m
9.CO.10FerrokentbrooksiteNa15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3Cl2Trig. 3m : R3m
9.CO.10KhomyakoviteNa12Sr3Ca6Fe3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m : R3m
9.CO.10ManganokhomyakoviteNa12Sr3Ca6Mn3Zr3W[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m : R3m
9.CO.10OneilliteNa15Ca3Mn3Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2Trig. 3 : R3
9.CO.10RaslakiteNa15Ca3Fe2+3(Na,Zr)3Zr3Nb<0.5[(Cl,OH)|(Si3O9)2|(Si9O27)2SiO] · 3(OH,H2O)Trig. 3
9.CO.10FeklicheviteNa11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5Trig. 3m : R3m
9.CO.10CarbokentbrooksiteNa11-12(Na,Ce)3Ca6Mn3Zr3Nb[(OH)3|CO3|(Si3O9)2|(Si9O27)2SiO] · H2OTrig. 3m : R3m
9.CO.10Zirsilite-(Ce)Na11-12(Ce,Na)3Ca6Mn3Zr3Nb(Si19O55)(Si3O9)2(CO3)(OH)3 · H2OTrig. 3m : R3m
9.CO.10Ikranite(Na,H3O)15(Ca,Mn2+)6Fe3+2Zr3-4[Cl|(H0-3Si3O9)2|{(Si9O27)2,(Si9O27)2SiO}] · 2-3H2OTrig. 3m : R3m
9.CO.10TaseqiteNa12Sr3Ca6Fe3Zr3Nb[Cl2|(Si3O9)2|(Si9O27)2SiO] · 3(O,OH,H2O)Trig. 3m : R3m
9.CO.10RastsvetaeviteNa27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2Trig. 3m : R3m
9.CO.10GolysheviteNa10Ca3Ca6Zr3Fe2SiNb(Si3O9)2(Si9O27)2CO3(OH)3 · H2OTrig. 3m : R3m
9.CO.10Labyrinthite(Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3Trig. 3 : R3
9.CO.10Johnsenite-(Ce)Na12Ce3Ca6Mn3Zr3WSi25O73(CO3)(OH)2Trig. 3m : R3m
9.CO.10MogoviditeNa9(Ca,Na)12Fe2Zr3Si25O72(CO3) (OH)4Trig. 3m : R3m
9.CO.10GeorgbarsanoviteNa12(Mn,Sr,REE)3Ca6Fe2+3Zr3NbSi25O76Cl2·H2OTrig. 3m : R3m
9.CO.10Aqualite(H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9ClTrig. 3 : R3
9.CO.10DualiteNa30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3Mn[Si51O144](OH,H2O,Cl)9Trig. 3m : R3m
9.CO.10AndrianoviteNa12(K,Sr,Ce)3Ca6Mn3Zr3Nb(Si25O73)(O,H2O,OH)5Trig. 3m : R3m
9.CO.10VoronkoviteNa15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl · H2OTrig. 3 : R3
9.CO.10UM1999-36-SiO:CaCeHMnNaNbSrZrNa17(Ca,Ce,Sr)2Mn3(Zr,Nb)4Si25O73(O,OH,F,Cl)5Trig. 3 : R3
9.CO.10UM2000-66-SiO:CaClFeHMnNaNbSrZrNa12(Ca,Mn)6(Sr,Na,K)3(Fe,Mn)3(Zr,Nb)4Si25O66(OH,Cl)11Trig. 3m : R3m
9.CO.10ManganoeudialyteNa14Ca6Mn3Zr3[Si26O72(OH)2](H2O,Cl,O,OH)6Trig. 3m : R3m
9.CO.10UM1990-78-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.10UM1971-22-SiO:CaClFeHMgMnNaNbZrNa12Ca5(Ce,La,Y,Ca)Zr3(Zr,Nb)(Fe,Mn)3[Si9O24-26(OH)1-3]2[Si3O9]2ClTrig. 3m : R3m
9.CO.10UM1998-21-SiO:CaCeClHMnNaZrNa16Ca6(Mn,Ce)3Zr3(Si3O9)2(Si9O27)2(OH,Cl)4Trig. 3m : R3m

Related Minerals - Dana Grouping (8th Ed.)Hide,Mn)3Zr3NbSi25O73(O,OH,H2O)3Cl2Trig. 3m : R3m,Ce)3Ca6Mn3Zr3Nb[(OH)3|CO3|(Si3O9)2|(Si9O27)2SiO] · H2OTrig. 3m : R3m,Sr,Ce)3Ca6Mn3Zr3Nb(Si25O73)(O,H2O,OH)5Trig. 3m : R3m[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m : R3m[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m : R3m 3m : R3m,Sr,REE)3Ca6Fe2+3Zr3NbSi25O76Cl2·H2OTrig. 3m : R3m

Other InformationHide

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 KentbrooksiteHide

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 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.
  • Minas Gerais
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)
  • Northwest Territories
    • Mackenzie District
      • Blachford Lake alkaline complex
        • Thor Lake syenite complex
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
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
    • Qeqqata
      • Kangerlussuaq Fjord (Søndre Strømfjord)
        • 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
    • Sermersooq
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.
  • 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]; 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
  • Azores District
    • São Miguel Island
      • Água de Pau Massif
Samples collected by Luigi Chiappino and analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
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
Pavel M. Kartashov data
          • Hackman Valley
Neues Jahrbuch für Mineralogie, Monatshefte (2003): 10: 461-480.
        • Alluaiv Mt
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
  • North West Province
    • Bojanala Platinum District
      • Western Bushveld 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.
  • Canary Islands
    • Santa Cruz de Tenerife Province
      • Tenerife
"Christof Schäfer"
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
Lapis 29(1), 47 (2004); Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 132(6): 15-21 (in Russian).
  • New Mexico
    • Otero Co.
      • Cornudas Mts
Dr. W. Stoll (private communication 2001 & 2004)
  • Wisconsin
    • Marathon Co.
      • Wausau Intrusive Complex
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.
Mineral and/or Locality  
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