_._-- -- American Mineralogist, Volume 69, pages 406-412, 1984 NEW MINERAL NAMES. PETE J. DUNN, LOUIS J. CABRI, GEORGE Y. CHAO, MICHAEL FLEISCHER, CARL A. FRANCIS, JOEL D. GRICE, JOHN L. JAMBOR, AND ADOLF PABST Argutite. The name is for the locality, the Carboire deposit on the Carboirite. Marimana Dome. J.D.G. Z. Johan, E. Oudin and P. Picot (1983)Germanium and gallium anal()gues of silicates and oxides found in the zinc deposits of central Pyrenees, France; argutite and carboirite, two new Chessexite. ~ineral species. Tschermaks Min. Petrogr. Mitt., 31, 97-119 H. Sarp and J. Defern~ (1982) Chessexite, a new mineral. (in French). Schweiz. Mineral. Petrogr. Mitt., 62, 337-341 (in French). Argutite Analysis by atomic absorption (N a and K by flame photome- try, S by chromatography, and H20 by TGA) gave S03 31.91, The average of seven electron microprobe analyses yielded Si02 3.64, Ah03 15.30, MgO 3.50, ZnO 3.73, CaO 3.92, Na20 Ge02 95.82, Mn02 0.17, FeO 1.20, ZnO 3.03, sum 100.22. This 4.44, K20 0.30, H20 31.11, sum 97.85. This gives the formula gives the formula (GeO.942,Mno.OO2,FeO.018,ZIlo.038)1:101.944or (Na3.75, Ko.17, Cao.08) (Ca1.75, M80.2') (Mg1.87, Znt.20) (AI,.85, ideally Ge02. M80.1') (Si1.,8, SlO.42)1:120'3.46 45.13 H20 or ideally (Na,K)4 No X-ray studies were possible due to the small grain size. Ca2(Mg,Zn)3AI8(Si04)2(S04)1O(OH)10 · 40H20. Argutite occurs in sphalerite as 10 p.m euhedral to subhedral X-ray study shows the mineral to be orthorhombic, a = 13.70, prismatic crystals with a predominance of {Ill}, {IOO},and {10I} b = 27.96, c = 9.99A,D calc. 2.21, Z = 2. The strongest X-ray forms. It is also associated with cassiterite, siderite and rarely lines (32 given) are 13.91(100) (020), 4.85(90) (231), 3.982(60) with briartite. Optically, argutite is similar to cassiterite with a (070,212,321,251), 3.451(40)(270), 3.422(100) (400,062,410), light grey reftectance and a distinct anisotropy. The reftectances 3.322(40) (003,420), 2.908(30) (450,191), 2.161(30) (324,254). are; nm(%) 420(13.7), 460(11.6), 500(11.0), 540(10.97), The mineral occurs as white, thin (0.003 mm), square or 580(10.93), 620(10.92), 660(10.93), 700(11.0), 740(11.1), rectangular plates (maximum 0.03 mm), with a silky luster. It 780(11.3). was found as a coating on fluorite which is the ore mineral at the The name is for the locality, the Argut Plane. Maine mine, near Autun, France. Optically biaxial, positive, parallel extinction, ns a = 1.456,13= 1.460, 'Y= 1.480, 2V ==47°, Carboirite X = a, Y = c. The name is for Ronald Chessex, University of Geneva. Type The eight electron microprobe analyses show a partial misci- bility between carboirite and chloritoid. Three analyses showing material is at the Museum d'Histoire Naturelle de Geneva. J.D.G. a wide variation are; Ge02 28.47, 18.44, 30.43, Si02 3.86, 10.66, 2.70, Ah03 28.01, 38.21, 34.93, Ga203 12.85, 0.10, 0.13, V203 n.a., 0.57, 0.00, FeO 21.92, 22.70, 24.08, MnO 0.27, 1.06, 0.65, MgO 0.00, 0.42, 0.00, ZnO 0.11, 2.09, 2.19, H20 (calc.) 6.04, Fergusonite-Beta-(Nd) 6.63, 6.22, sum 101.53, 100.88, 101.33. The ideal formula is Sun Weijun, Ma Fengjun and Zhuang Shijie (1983) Fergusonite- Fe2+AhGe05(OHh. beta-Nd. Scientia Geologica Sinica, 78-81 (in Chinese with X-ray studies show it to be triclinic, space group cT (for English abstract). comparison with monoclinic chloritoid), a = 9.513, b = 5.569, c Electron microprobe analysis gave La203 2.05, Ce203 14.62, 9.296A, a = 96.08, ~ = 101.52, ~ = 89.450,Z = 4, D calc. = = Pr203 4.28, Nd203 21.25, Sm2034.53, EU203 0.21, Gd203 1.37, 3.95 (for Ge/(Ge+Si) = 0.75). The strongest X-ray lines (20 given) are 4.785(5) (110), 4.528(10)(002),3.020(8)(003),2.728(9) Tb203 0.71, DY203 0.98, H0203 0.56, Er203 0.51, Tm203 0.36, (021), 2.480(9)(022), 1.854(6)(314),1.608(7)(331), 1.384(6)(040). Yb203 0.45, LU203 0.29, Y203 2.83, Nb20, 41.00, Ta20, 0.11, Carboirite occurs as green, pseudo-hexagonal plates (100 x Th02 1.09, U02 1.46, Ti02 0.17, MnO 0.30, FeO 0.27, CaO 0.29, 100 x 30 p.m) with crystal forms {001},{110},{010}and a (001) zr02 0.19, MgO 0.07, Ah03 0.12, Si02 0.29, sum 100.36%. The analysis corresponds to (Ndo.38CeO.27Lao.04PrO.08Smo.08Gdo.02 cleavage. It has. a vitreous luster and H - 6. It is found in _ 1.02(U,Th, Ca, sphalerite, often associated with Ge-bearing quartz. Optically ThO.OIDYO.02HOo.oJErO.OITI11o.01YbO.OIYo.08h: Fe)O.06(Nb, Ta, Ti)0.9604 or ideally (Nd,Ce)Nb04. biaxial positive, ns a = 1.731, 13= 1.735, 'Y= 1.740, 2V = 7°. Pleochrois,m;X = bluish green, Y light blue, Z = The mineral is essentially metamict. Precession and Weissen- = colorless to berg photographs of heat-treated specimens were poor but yellow. showed the mineral to be monoclinic with a = 5.07, b = 5.62, c = 5.41A,13== 93.0°.Long-exposureX-raypowderphotographsof untreated material gave: 3.2064(10), 3.0253(10), 2.7976(5), * Minerals marked with asterisks were approved before publi- 2.6961(5), 2.0648(5), 1.9549(5), 1.8832(9), 1.6691(5), 1.6024(5). cation by the Commission on New Minerals arid Mineral Names Infrared spectra of the mineral showed absorption bands at of the International Mineralogical Association. 1452(s), 1094(s), 1020(m), 878(s), 614(w), and 466 cm-l(m). 0003-004X184/0304-0406$02.00 406 NEW MINERAL NAMES 407 The mineral is brownish-red, red, yellowish-brown or yellow- Microchemical tests and DC arc spectroscopy gave CaO ish-red with pale brown streak and vitreous to greasy luster. The 12.06, MgO 4.46, Ah03 11.06, S03 34.40, H20 32.00, F 9.44, mineral has subconchoidal fractures and no cleavage. Magnetic corrected total 99.45%, leading to the formula HC(4Mg2AI4 susceptibility is moderate (0.3-0.6A). Under normal lighting the (S04)8F9 · 32H20. Lannonite is insoluble in water but dissolves mineral appears to be isotropic, but in bright light some grains readily in cold dilute acids. are weakly anisotropic, n = 2.0. After heating tol000°C the The X-ray powder data are indexed using a tetragonal unit cell: mineral becomes yellowish green and shows more distinct inter- a = 6.84, c = 28.01A. The strongest lines (26 reported) are ference colors. 13.98(100)(002), 4.840(70)(110), 3.456(70)(017), 3.980(50)(114), The mineral occurs as irregular grains and rarely prismatic and and 3.325(50)(022). D calc. 2.32, meas. 2.22. Z = 1. bipyramidal, (0.02-0.06 mm, max. 0.25 mm) in a niobium-rare Lannonite is chalky white, occuring as nodules composed of earth deposit in a proterozoic riebeckitized dolomite at Bayan 10-20 #Lmsquare plates. It is a post-mine product associated with Obo, Inner Mongolia, China. The associated minerals are rie- gypsum, khademite, and wilcoxite at the Lone Pine mine, Catron beckite, ferroan dolomite, biotite, magnetite, monazite, bastnae- County, New Mexico. H = 2. Uniaxial positive, w = 1.460, E = site, aeschynite-(Nd), ilmenite, pyrite, fergusonite-(Ce) and fer- 1.478. gusonite-(Nd). G. Y.C. Lannonite was named for Dan Lannon, who staked important claims in, this district in 1893. Type material is to be deposited in the collections of the University of Arizona (Tucson) and the Gortdrumite* British Museum (Natural History). C.A.F. Steed, G. M. (1983) Gortdrumite, a new sulphide mineral con- taining copper and mercury, from Ireland. Min. Mag., 47, 35- Mundrabillaite* 36. P. J. Bridge and R. M. Clarke (1983). Mundrabillaite-a new Electron microprobe analyses of four grains in two polished cave mineral from Western Australia. Min. Mag. 47, 80-81. sections averaged: Hg 41.55, Cu 38.68, Fe 2.07, S 16.81, sum 99.11%, yielding the empirical formula (Cu,Fe)6Hg2Ss. Electron microprobe analyses averaged CaO 20.4, P20S 48.6, X-ray powder data were indexed using an orthorhombic cell K20 1.09-0.60, Fe203 0.08-0.02, S03 and MgO both 0.04%. with a = 14.958, b = 7.900, and c = 24.10A, suggesting unit cell Qualitative tests for NH3 and H20 were positive. It is soluble in contents of 4[Cu18FeH86S16]. The strongest lines (22 given) are: water. X-ray powder diffraction study shows this mineral to be a 6.03( 40)( 112 ,004), 4.58( 100)(302,105), 3.38(70)( 410,403), potassian variety of (NH4h Ca (HP04h . H20 (form A). 2.88(50)(323), 2.78(50)(511). The X-ray data were indexed using a monoclinic cell with Grains less than 200 #Lm x 50 #Lmare isolated in dolomite or possible space groups Pm, n, or n/m and unit cell parameters a intergrown with bornite in samples from a cinnabar-bearing = 8.643, b = 8.184, c = 6.411A, f3 = 98.0°.