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Souvarps BOBFERGUSONITE: a NEW PRIMARY PHOSPHATE Canadian Mineralogist Yol.24, pp. 599-604(1986) BOBFERGUSONITE:A NEW PRIMARYPHOSPHATE MINERAL FROM CROSSLAKE, MANITOBA T. SCOTTERCITI, ALAN J. ANDERSON2,PETRTnnn.f ANDFRANK C. HAWTHORNE Department of Geological Sciences, tlniversity of Manitoba, Winnipeg, Manitoba R3T 2N2 ABSTRACT Na2Mn5Fd+Al(POl6Q:4').les sixraies les plus inten- sesdu clichdde poudre[d in A, 1>40] sont:3.05(100), The new mineral speciesbobfergusonite occurs as abun- 2.87(66), 2.7 | (49),2. 5 I (53),2.08(67 ) et I .5 8(43) ; Les para- dant, Iargeanhedral crystals in a granitic pegrnatiteat Cross pbtresr6ticulaires sont: c 12.773Q),b 12.46Q),c 11.038(2) Lake, Manitoba. It rangesin color from red-brown(holo- 4., 9 97.15', groupeP2/n, La bobfergusoniteressemble type) to green-brown, has ayellow-brown streak, resinous beaucoupaux membres du groupede la wyllieite,mais elle lustre and is nonfluorecent, The measureddensity is 3.54(l) s'endistingue tant par sastructure que par sacomposition. g/cm3; the hardnessis 4. It is biaxial (+), a 1.694(l), g Le nom honoreRobert Bury Ferguson. 1.698(l),1 l.7l5Q), 2V 46.4(2)o,pleochroism ,Y: Fyellow- orange,Z orange, f[D and a.\X= + l0' in the 0 angle. (Iraduit par la Rddaction) The averagechemical composition for the holotype (wt.9o) is: Na2O6.8, MgO 0.3, CaO 1.2, MnO 31.?, FeO 0.3, Mots-cl6s:bobfergusonite, nouvelle espice min6rale, phos- ZnO 0,1,Al2O3 7.5, Fe2O36.9, PzOs45.2,H2O 0.3, total phate, pegpatite granitique, Manitoba, wyllieite, 100.3. The semiempiricalformula,. (Na2.sMns.53Cas.2s alluaudite. tr r.uo)za(Mnr.eaAl1.39Fe3+6.s1Mgg .u.,F e+ o.uzno.u)roPs.ss INTRODUCTION (OB.6eOHo.3l)D24considered yrith structural data, gives the ideal formula Na2MnrFe3+AI(PO)6 six Q=4). ^The phosphate strongestlines of the X-ray powder pafrern td in A, /> 4()l Large crystals of a resinous brown are 3.05(100),2.87 (66), 2.71(49), 2.51 (53), 2.08(67)and mineral were found (by AJA) in a granitic pegma- 1.58(43). The unit-cell.parameters are a t2.773Q), b tite at Cross Lake, Manitoba. An initial electron- 12.486Qr,c 11.038(2)4,, B 97.15.; the spacegroup is microprobe and X-ray-diffraction investigationof P21/n. lt is most closely related to wyllieite-group the mineral showedit to be closely.relatedto, but minerals, from which it differs in both structure and com- distinct from, the wyllieite-group and alluaudite- position. The mineral is named after Dr. Robert Bury Fer- group birth- guson. minerals. With the retirement and 65th day of ProfessorRobert Bury Fergusonat hand, and Keywords: bobfergusonite, new mineral, phosphate, gra- preparations underway for this special issueof Zfte nitic pegmatite, Manitoba, wyllieite, alluaudite. Canadian Minerologist, we chose to honor our friend, colleagueand teacherby naming this mine- gives gxeatpleasure Souvarps ral after him. It us to announce the new speciesbobfergusonite. It is particularly fit- ting that this new pegmatitic phosphate from Mani- La bobfergusonite,nouvelle espbce min6rale, forme de larges cristaux idiomorphes en abondancedans la pegma- toba is named after Dr. Ferguson, doyen of modern tite granitique du lac Cross, au Manitoba. Sa couleur va mineralogyin Manitoba, in honor of his contribu- du rouge-brun (holotype) au vert-brun; sa rayure estjaune- tions to mineralogy and crystallography, many of brun, et son dclat, r€sineux.Elle n'est pas fluorescente.Den- which havefocused on granitic pegmatites(e.g., Can. sit6 mesurde3.54(l), duretd 4. Elle est biaxe positive, o Minerol. 11, Part 3). The new mineral and its name r.694(r),B 1.698(1),7 r.715(2),2v46.4Q)", pl6ochroiime have been approved for publication by the IMA X= Y jaune-or4nge,Z orange, fll0, aAX: + 10. dans Commission on New Minerals and Mineral Names. I'angle B. Sa compositionmoyenne (90 en poids) d'aprbs Holotype material (grams) is preserved in the col- les rdsultats analytiques sur l'6chantillon holotype, est: lections of the Mineralogical Museum, University of Na2O6.8, MgO 0.3, CaO 1.2,MnO 31.7,FeO 0.3, ZnO 0.1,Al2O3 7,5, Fe2O3 6.9, P2Os45,2, H2O 0.3, total 100,3. Manitoba, Winnipeg (M6083),andthe Royal Onta- La formule semi-empirique, (Na2.s7Mn9.53Ca6.rorio Museum, Toronto 0i/.42687).More abundant, + preserved n r,20)E4(Mn3.6sAll.39Fe3+o.8tM g6.stF & s.aiZno.or)>oPs.seideotype material is also at these institu- (OB.6eOH0jt)r2a considdrdei la lumibre des donndes tions. structurales, mbne i la formule id6alisde LocauoN AND OCCURRENCE lPresent addressi Mineral SciencesDivision, National Museum of Natural Sciences,Ottawa, Ontario KIA 0M8. The new phosphatemineral occursin an unnamed 2Presentaddress: Department of Geological Sciences, pegmatite at Cross Lake in central Manitoba, about Queen'sUniversity, Kingston, Ontario K?L 3N6. 5 km north-northwest of the Cross Lake settlement. 599 Downloaded from http://pubs.geoscienceworld.org/canmin/article-pdf/24/4/599/3445950/599.pdf by guest on 28 September 2021 600 THE CANADIAN MINERALOGIST The pegmatite,denoted #22by Anderson(1984), is sity and extreme Mn-enrichment. Assemblagesof located at the southeasternshoreline of an unnamed primary phosphate minerals in granitic pegmatites islandin the westernpart of the lake (Long. 54" 4l' are typically much lessdiverse, and not as intimately N, Lat. 97"49' W), associated,the minerals occurring most typically as The parent pegmatiteis a memberof the Northern large isolated crystals.All of the primary phosphates pegmatite seriesof the Cross Lake pegmatite field. present are the examplesrichest in Mn known for This field is hostedby the CrossLake greenstonebelt iheir species, and have very high values of in the SachigoSubprovince, at the northwesternedge Mn/(Mn+Fe2+). The assemblagewill be dealtwith of the Superior Province of the Canadian Shield. in greaterdetail in a later paper, when all of its mem' Although no agedetermination is available for these bers have been more completely characterized. pegmatites,they probably are of the samelate Keno- ran ageas other fields of rare-elementpegmatites in PHYSIcALAND OPTIcAL PnoPpntms the Superior Province. Preliminary Rb/Sr isotopic data indicate I minimu6 ageof 2.5 Ga for the leu- Bobfergusonite typically occurs as anhedral, cogranitesof the CrossLake field (G.S. Clark & R.E. equant single crystals' or :rs aggregatesof relatively Meintzer, pers. comm. 1985). few crystals. Crystal sizeranges from lessthan I mm Most pegmatitesof the Northern seriesbelong to to I cm long. The mineral is variablein color, rang- the beryl-columbite type of the rare-element class ing from green-brownto red-brown. The red-brown of pegmatites. However, the overall geochemical variety was initially perceived to be volumetrically signature of this seriesis rather exceptional among the most significant, so representativered-brown the peematite populations of the Superior Province. material was designated as the holotype. All data The seriesis poor in rare alkali metals, particularly presentedin this paper pertain to the holotype, unless Li and Rb relative to Cs. In contrast, enrichment in otherwisestated. Mn andF h noticeablein the most fractionated mem- All color varieties are nonfluorescent and have a bersof the series,such as the#22peg$atrte(Ander- yellow-brown streak. The mineral is brittle' shows son 1984). perfect {010} cleavageand has a prominent {10{} parting. The lustre is resinousexcept on the parting PARAGENESIS surface,which showsa characteristicbronzy lustre. The measureddensity is 3.54(1) g/cm3, based on The #22 pegmatiteis emplacedin metagreywacke, five repeatedweighings with a Bermanbalance; the which gradesinto metaconglomeratesouth of the mean ialculated density of 3.57 g/un3 agreeswell dyke. The main part of the pegmatite is 40 m long with the measuredvalue. The hardnessis 4. and up to 6.7 m wide in outcrop, with prominent Small chips of the mineral are transparent.Bob- but asymmetric zoning. The wall zone, adiacent to fergusoniteis biaxial positive. Indicesofrefraction the northwestern contact, consists mainly of sac- were measured by the Becke line method with the charoidal albite and qtJarlz, with scattered garnet, useof a spindle stageand a Na-light source(589 nm): schorl, muscovite and K-feldspar. The samemineral a L.694(l),B 1.698(l),y l3l5Q). The 2V ansle' assemblagedominates the outer intermediate zone, determined from extinction curves refined from in which it is accompanied by columbite-tantalite, spindle-stagedata using the program EXCALIBR microlite, apatite, and beryl. Large crystalsof brown (Bloss1981), is 46.4Q)", which compareswell with K-feldspar and book muscoviteform the inner inter- 2V(calc) 52o. The optic orientation is Y[b and mediatezone, separatedfrom a segmentedquartz oAX: + 10oin the 0 angle.Pleochroism is moder- "gore" by core-margin muscovite and columnar ate: X= I yellow-orange,Z orange.Absorption: greenberyl. The quartz "core" is in contact with the Z>X- L Using the Gladstone-Daleconstants of wallrock along the southeastern flank of the peg- Mandarino (1981),the compatibility index is 0.014' matile. indicating superior agreementbetween physical and Phosphateminerals most cornmonly occur as nod- optical data. ules in the intermediatezones of the pegmatites; however,large, isolatedcrystals of bobfergusonite X-Rev CnYstanlocnnPgY with no associatedphosphates are alsopresent. The nodules consist of intimately associated primary Precessionphotographs of bobfergusoniteare very phosphateminerals, which show little or no replace- similar to those of the wyllieite-group minerals, ment by secondaryphosphates. These primary phos- exceptfor the presenceof largenumbers of diffrac- phate minerals are bobfergusonite,beusite, fillowite, tion spots at 1/zh and t/z/ (wyllieite cell), suggesting triplite, apatite, and an unknown Mn-phosphate. that the bobfergusonite structure is a derivative of Very minor alluaudite is also present, and is proba- the wyllieite structure. The cell volume is four times bly secondary in origin. that of the wyllieite structure; however, a and c can The phosphateassemblage is unique for its diver- be resetto give a unit cell with only twice the volume Downloaded from http://pubs.geoscienceworld.org/canmin/article-pdf/24/4/599/3445950/599.pdf by guest on 28 September 2021 BOBFERGUSONITE, A NEW MINERAL SPECIES FROM MANITOBA 601 of the wyllieite structurp.
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