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NEW MINERAL NAMES* Jorrn L. Hvrnon Ennsr A. J. Bunxn American Mineralogist, Volume 76, pages2020-2026, 1991 NEW MINERAL NAMES* JorrN L. hvrnon CANMET, 555 Booth Street,Ottawa, Ontario KIA OGl, Canada EnNsr A. J. Bunxn Instituut voor Aardwetenschappen,Vrije Universiteite, De Boelelaan 1085, l08l HV, Amsterdam, Netherlands Ankangite* ramdohrite, a new sulfosalt.Doklady Akad. Nauk SSSR (1989),305, 1468-1473(English translation available). Ming Xiong, ZheshengMa,Zhizhong Peng(1989) A new mineral-Ankangite. ChineseScience Bulletin, 34(7), Ramdohrite was described by Ahlfeld in 1930 as 592-596 (in English). AgrPb.SbuS,r,but recent investigations by different au- thors (Mo€lo, Makovicky, Karup-Moller, Borodayev, Electron-microprobeanalysis gave TiO, 54.0891[sic], BaO 20.5927, V,O. 22.3242, Cr,O. 2.0792 wto/o(sum Mozgova and others) have shown that ramdohrite is a member of the andorite-fizelyite homologous series in 99.0852),corresponding to Ba,087 (Ti5 4s2V2 4r,Crorrr)", ,,u- : general O,u, ideally Ba(Ti,V,Cr)rO,u.The valencestate of V was which N 4 and with the formula Ag,- confirmed by X-ray photoelectron spectroscopy;no OH Pb3- r, (Sb,Bi).*"Su; ramdohrite is Ag6Pb,2Sb22S48with vir- or HrO is evident in the infrared pattern. Occursas black, tually the sameunit-cell parametersas fizelyite. Electron- euhedral to subhedral tetragonal prismatic crystals up to microprobe analysis of material from Alyaskitovoye tin-tungsten deposit in Yakutia shows two Bi-rich ram- 0.5 x 0.5 x I mm, showing{100} and {110}; grayish black streak,vitreous to adamantineluster, brittle, VHN'. dohrite phases:Ag 11.8, 10.6,Pb 27.5, 30.0, Sb 21.4, : 874, uneven fracture approximately normal to elon- 23.0,Bi 21.4, 15.4,S 18.5,18.9, total 100.6,97.9wto/o, gation,D-",, : 4.44,D."t : 4.389 g,/cm3with Z : l. The giving respectivelyAg, ,oPb, ,o(Sb, ,6 Bir or),r^ Sr^ and X-ray in- DTA curve showsan endothermic peak at 588 "C and an AgonnPb, os(Sbr e0Bi0 ro)r, unSr rr. diffraction data parameters for andorite series exothermic peak at 643 "C; the latter correspondsto a dicate normal subcell the gain of 2.8 wo/o on the TG curve and is attributed to atda2c' superlattice.X-ray powderpatterns ofthe phases oxidation of V. In reflected light, rosy gray-white, aniso- are similar and resemble those of the fizelyite standard. tropic, weak to distinct bireflectance;reflection pleoch- As computed by the formula recommended by Mako- roism O : pinkish gay, E: light pink (: c); no internal vicky and Karup-Moller (1977), however,Ndiffers mark- reflection;at 589 nm, R.:20.1o/o, R.: 12.80/0.Single- edly from that of andorite: for Bi-rich ramdohrite, Nis 5 crystalX-ray study gavea: l0.l l8(l), c : 2-956Q)L, rather than 4. Thesephases also do not frt into the general - spacegroup 14, 14, or I4/m for a subcellin which c: formula of the andorite series:a new 2Ag* Pb2* type | / 2.27c*, indicating a one-dimensionalincommensurate of substitution is proposed, called ramdohrite to distin- modulation. The nine lines given for the powder pattern guish it from the well-known gustavite substitution. The (subcellindexing) are 3.580(50,220),3.202 (100,310), new general formula for the fizelyite-ramdohrite part of the seriescan then be written as Ago 2.476(7 0,21 t), 2.264(40,420),2.333(50, 30 I ), l .892 (50, uu*,*rrPb,6? 2, ,(Sb, 4 I l), 1.685(50,600),1.589(7 0,521,620), and 1.397(50,640,Bi)26r*.56, in which x is the gustavite substitution and y 54l). the ramdohrite one. In reflectedlight, bismuth ramdohrite The mineral occurs in a qtartz vein, associatedwith is similar to bismuthian andorite: bluish white color, av- barite, barytocalcite, roscoelite, and diopside. The new erage bireflectance(in lightest position as for galena, in name is for the locality, Ankang County, Shaanxi Prov- darkest position bluish gray with greenish tint), average ince, China. Differs from priderite, which is K dominant, anisotropy with bluish brown color effects, no internal and from redledgeiteand mannardite in cell dimensions reflection, fine, flaky, saw-toothed twins in one or two and the absenceof HrO. directions. Discussion.The repository for type material is not stat- Discussion. The new name, bismuth ramdohrite, was ed. J.L.J. not intended by the authors but is a figment of the trans- lation. The original Russian title Vismutovyyramdorit- Bismuth ramdohrite novaya raznovidnost sulfosoleyshould have been trans- lated as Bismuthian ramdohrite, a new sulfosalt variety. Yu.S. Borodayev,N.N. Mozgova,S.N. Nenasheva,O.V. Mo6lo et al. (Documentsdu BRGM, 167, 107 pp., 1989) Kuzmina, A.V. Yefimov, A.F. Sivtsov (1990)Bismuth also have describedmembers of the andorite-fizelyite se- ries with N: 5, and a ramdohrite bismuthiJbrewith 17 * Before publication, minerals marked with an asterisk were approved by the Commission on New Minerals and Mineral wto/oBi, but also with BilSb atomic ratios >1. Further Names, International Mineralogical Association. studies are in progress.E.A.J.B. 0003-004x/9r/ | | r2-2020s02.00 2020 JAMBOR AND BURKE: NEW MINERAL NAMES 2021 Camgasite* 0-6) and Si (range 2-4), respectively, and with oblique K. Walenta,P.J. Dunn (1989)Camgasite, a new calcium- axesV andZ for the respectiveoctahedral trivalent cations magnesium arsenate mineral with composition R3t (range0-4) and the number of vacant octahedralsites CaMg(AsO.)(OH).5HrO from Wittichen in the Central tr (range 0-2). Black Forest.Der AufschluB,40,369-372 (in German, The chemical composition of chlorite at any point in English abstract). the field is controlled by the formula [(Mg,Fe'z",Mn,- Ni),u_,_,,(Al,Fe3*,cr,Ti4*)/E,l(si(4,)Al")o' This Electron-microprobeanalysis gave C-a0 I 8.9, MeO 12.9, o(oH)r. is superior for trioctahedral and dioctahedral AsrO, 37.9, HrO (by difference)30.3, total 100.0 wt0/0, formula existing formulas cover only particular leading to a formula (calculated on the basis of 10 O chlorites because chlorite compositions. The motivation to diverge from atoms)Ca, ouMg, o,As, ooH,ourO,o, or ideally CaMg(AO.)- previous which are based principally on (OH).5H,O. A direct analysisfor HrO was not possible classifications, substitution, is the dependencyofthe structure becauseof intimate intergrowth with monohydrocalcite. tetrahedral on substitution in the octahedral sheets.In Single-crystalX-ray study indicated monoclinic symme- of chlorites nomenclature of Bailey for chlorites (ln. try, spacegroup probably P2,/m, a:9.18(3), b:7 .63(2), the approved Mineral., 65, l-7,1980) all end-membersand the solid c: 16.27(5)A, B: 128.0(5f,Z: 898.0A" Z:4, D"ur, among them project to one single point in the : 2.335 (with empirical formula), D-"". : 2.4(l) g/cn3. solutions The authors propose another no- The strongestlines (42 listed) of the powder pattern (Fe new unified system. menclature for the chlorites, which is basedon the divi- radiation)are 7.28(I 00,I 00), 6.42(I 00,002),4.00(80, I 04), vacant isolines in their projection system, on 3.28(80,022,210), 3.2 I (80,205,004), 3.02 (80 diffuse, 20 l, sion along predominant octahedral cation and, for prefixes, on 304),2. 96(80 diffuse, 21 5,103,0 | 4), and 2.5 4(80,306,005, the predominant cation. In this new nomenclature 216,202,030,31l).The mineral occurswith monohydro- the second and previously discardednames are re- calcite, calcite, gypsum, rapidcreekite, novacekite, ery- many traditional (e.g., ripidolite, corundophyllite). Al- thrite, and hdrnesite as secondaryminerals in crusts on instated diabantite, trioctahedral chlorites would require about 220 hydrothermally altered granite with U and Co mineral- though the names in the new system, the authors propose to retain ization in the lower adit (no longer accessible)ofthe Jo- by Bayliss(Can. Mineral., 13, 178- hann mine near Wittichen, Black Forest, Germany. The only those defined mineral was previously describedby Walenta in 1966and 180,1975). The authors mention in their paper that 1972 as mineral a. Camgasite forms idiomorphic pris- Discussion. they have submitted the proposed speciesnames, based matic crystalsup to 0. l5 mm long,slightly elongate [010], on their classificationscheme, to the Nomenclature Com- with pinacoids{100}, {010},and {001}.Colorless, trans- mittee of the AIPEA (Association Internationale pour parent to translucent, white streak, vitreous luster, good I'Etude des Argiles), which consideredand rejectedthem cleavages{100} and {001}, conchoidalfracture, flabout 1989. The paper is thus a straightforward 2, no fluorescence,easily soluble in dilute HCI and HNO3. on 30 August violation of internationally adopted procedures on the Optically biaxial positive,a: 1.540(2),B : 1.548(calc.), publication of mineral names. Journals should require y : 1.563(2)at 589 nm, 2V : 74, X : b, Z roughly strict adherenceto these procedures. parallel to one crystal edge of unknown direction. Poly- from their authors synthetic twins have been observedin sectionsparallel to E.A.J.B. {010}. The compatibility index [l - Ke/K,l is -0.022, "excellent." The name is for the composition (Ca-Mg-As). Type material is at the Institute of Mineralogy and Crystallog- Clinomimetite* raphy of Stuttgart University, and at the Smithsonian In- YongshanDai, J.M. Hughes,P.B. Moore (1991)The crys- stitution, Washington. E.A.J.B. tal structures of mimetite and clinomimetite, Pbr(AsOo)rCl.Can. Mineral., 29, 369-37 6. Mimetite, Pbr(AsO")rCl,is hexagonal,space group P6r/ m' At 98-120 oc' mimetite undergoesa reversible phase New nomenclaturefor chlorites transition to a monoclinic dimorph, now named clino- A.
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