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New Lead Sulfantimonides from Madoc, Ontario

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New Lead Sulfantimonides from Madoc, Ontario NEWLEAD SUTFANTIMONIDES FROM MADOC, ONTARIO. PART2_MINERAI DESCRIPTIONS J. L. JAMBOR Geol,ogical Survey of Canad,a, Ottawa AssrRAcr Itaunayite, playfairite, sterryite, twinnite, guettardite, and sorbyite are new lead sulfantimonides from Madoc,Cintario. An addiiionalsulfosalt, designated mineral eM, may be identical to coleman's (19b8)minerar e from yellowknifi, N.w.T. The-iew minerals are associatedwith boulangerite,jimesonite, antimonian baumhauerite (sb-:Aq: -1:1), zinckenite,semseyite, g"o".ottitu, robinsonite, and a few other sulfides andsulfosalts. IutnooucrroN In Part | (can. IvI'ineral.9, pt. 1, pp. z-24) the geological occurrence of the Madoc sulfosalts and the methods used to determine their com- positions were outlined, and two of the new minerals were described. Descriptions of the remainder of the new sulfosaltsr and tieir associated minerals are given in the present article. The concluding paper (part B) will consist of remarks on the paragenesis, possible mode of origin of the Madoc minerals, and brief notes on the synthesis of some pb-Sb-As sulfosalts. Opti,cal,Properti.es Data on polarization colours of the new [4adoc sulfosalts are lacking in the descriptions given below. The correct determination of this property is discussed by Bowie & Taylor (19b8), but the writer has unfortunately been unable to duplicate their data on known sulfosalts. The colours given in Part 1 for madocite and veenite will thus probably require revision. All the new sulfosalts described below have srrong anisotropism, but the citing of polarizationdata must be deferred. Leunavrre Launayite is named in honour of L. de Launay in recognition of his contributions in the nineteenth century concerning the origin of mineral deposits. lThe nameshave beenapproved by the I.M.A. commissionon New Minerals and Mineral Names. 191 L92 TIIE CANADIAN MINERALOGIST Crystall,ograPky Launayite is monoclinic, witJr the'following cell dimensions: dno : 41.7 A" a:42.6 + 0.8A d,orc:4.02 X2 b :2b' : 8.M + 0.05 door- 31".5 c:32.3+0.6 B'r' : 77"55' I : L02o05'*45' The b-dimension has been indicated above as being twice that of the pseudocell. Diffraction rows equivalent to 2b' are extremely weak and tarely discernible. For the pseudocell, hkl, ditrraction spots appear only when the sum of h and k is even. The space group is therefore C2, Cm, or C2/nn (Nos. 5, 8, or 12 respectively). X-ray powder data for launayite are given in Table 1. The powder pattern is similar at first glance to that of cosalite, zPbS.Bi2&, but the analogous formula 2PbS.SbzSa is not compatible with any of the results obtained for launayite. Because of the limited amount of material available and the possible presence of two perfect cleavages in launayite, the x-ray powder patterns Tesr-s 1. LeuNevtre: X-uv Powoen Dere (CuKa radiation)' I"d"""g b.-d." p I (est) d (meas) d (calc), hhl' <, s.504 8.67A 203 <+ 7.*L ( .at 004 <+ 6.88 6.91,6.90 602,2M E 4.25 4.25,4.24 m.0.2.605 8 4.t7 4.18,4.L7 m.0.3,10.0.0 , 4.O4 4.05,4.02 T0.Q,+,zos 3 3.97 3.98,3.97 804.408 , 3.87 3.87,3.86,3.86 I0. o_:b,511,112 3 3.76 3.78,3.76 608,113 2 3.63 3.63,3 .62,3 .62 511,10.0.3,510 1 5 3.56 severalpossibilities <* 3 .50 3.51,3 .50 Eo8.oo9 10 3.45 3.46,3.45 512',8.0.4 tt 3.40 3.4L,3.4L,3.40 514J15,10.0.4 .I(est) d(meas) -I(est) d(meas) .I(est) d(meas) f(est) d(meas) , 2.752 I 2.187 <+ 1.894 3.34 5 t .*B 1 3.31 2 2.652 I 2.L48 t.872 <* 3.23 2 2.MO 2 2.L26 a r.a4 .L 1 1.809 2 3.L7 <t 2.610 I !2.095 1 3.10 <* 2.538 I'2.O18 2.081 <6 L.756 , 3.01 1 2.495 1 <* L.773 1 I 3B L.729 5 2.56 , 2.438 7 2.010 8 2.92 2 2.319 <e L.972 t 1.699 <+ 2.W4 , 2.280 <t L.954 2B r,.657 I ! 1.635 5 2.836 u 12.228 2 1.936 I , 2.787 \2.222 1 1.913 LEAD SULFANTIMONIDES FROM MADOC 193 which have been obtained are not of very good quality. The data listed are thereforea compositeof measurementsobtained from both bz mm and 114mm films. Properties Launayite has been observedonry in polishedsections, where it occurs sparingly in association with veenite and boulangerite. Launayite dug out from polished sections tends to be somewhat fibrous, the elongation being The fibrous [010]. habit resultsfrom intersectingperfect {100} and {001} cleavages.The colour of tre mineral is metalric lead-grey and the streak black. In reflected light, launayite is fairly strongly pleochroic from white to grey. The maximum and minimum reflectivity percentagesat tr470,546, 589,and 650pare, respectivery,46.2-8g.6,48.g-t6.g, 42.2-86.2,40.g-85.b. The Talmage hardnesswas estimated to be c; the mean vickers hardness with a 50 gram load is rzg (Lzr-Lgz). Indentations are square and are accompaniedby star radial and cleavage fractures. KoH gives a light brown tarnish which is characteristic and seryesto distinguish launayite from all other Madoc sulfosalts. The remainder of the standard etch tests are negative except for 1:1 HNoa, which rapidly tarnisheslaunayite iridescent,then black. Ch em'i s tr y and.d. en s,ity _.Microprobe analysesof two grains of raunayite are given in Tabre 2. The results agree well with gpbs.bsb2sa, but this formula requires :5 Z f.or D: 5.80. A more satisfactoryformula is 22pbS.lBSb2Ss, : which wirh Z 2 (pseudocell) yierds a talculated density of b.g3 as comparedto tjre determinative curve value of 5.25 f.orthis composition. Taslp 2. LauNe'n:rs:*t"lnryi: Courosrrron ftrf::nflJ*oRErrcar Analyses wL /a Atomic ratio Ideal Av. (average) Proportions wt.7o Pb 48.5 48.5 48.5 0.2uI Sb '?u 'lE 22 47.W As i?o gffifi\ozazz24.7 32.70 21.5 2t 21.25 0.aszi', 62.9 20.2L 101.5 100.0 100.75 100.00 fraY'*rliffi iili3ffi B:; iB[*uA.)',os u,o t94 THE CANADIAN MINERALOGIST Pr.nvrlrntrB Playfairite is namedin honour of John Playfair (174s-1819),author of "Illustrations of the Huttonian Theory of the Earth"' CrystallograPky Two fragements taken from a polished section yielded the following celldimensions: a:45.4+0.54, b:2b':8.29 +0'06, c:27'3t 0k0 with 0.5, B : 92"30'+ 30'. The only systematic extinction is h, : 2n, and even this is tentative becauseonly two orders of (0&0) can be recorded on precessionfilms witJr copper radiation' The space group of tlre playfairire pseudocellis P2, Pm, or P2/m if k * 2n, and P2r or P2t/rn if.i : 2n.The indexedr-ray powderpattern is given in Table 3' Properties Playfairite has been observedin a number of polished sections,always in very small amounts. The mineral characteristically occurs at the peri- Tasr-s 3. Plevrernrta: X-nev PowoBn DAte, 114'6 mm camera, CuKa radiation' t"^.""ffi": *.^,r' : ^*'. _ -I(est) d(meas) d(calc), hkl' <+ 12.04 12.084 301 <, 11.3 11.34 400 <+ 9.9 10. 19,9 .83 401,401 <+ 8.6 8.53 302 <+ 8.0 7.53 402 I 402,600 d t.5 7 .60,7.56 1 7.02 7.06,7.06,7 .03 Soz,Toa,oor <i 6.32 6.32 303 <+ 6.L4 6.14 40B 5.63 5.M 702 <+ 004 <* 5.35 5.32 go1,3M_ <+ 4.98 4.95,4.95 4L, 4.71 4.74,4.68,4.68 4c4,703,5M <b 4.50 4.53,4.50,4.48 8oa,5M,9ot_ 2 4.22 4.24,4.22,4.22 m.0.2,1Q5,205 2 4.1.0 4.11,4.08 10.0.2,11.0.1 3.98 3.99,3.99,3.97 21,1,31,0,804 d(meas) .I(est) d(meas) 1(est) d(meas) "I(est) d(meas) -I(est) 1.886 I 3.88 o 2.92 <+ 2.277 <* I I .868 o 3.77 3 2.865 <+ 2.24:7 L 1 t.822 3 3.66 7 2.785 2 2.228 a 3.59 <+ 2.710 <+ 2.202 2 1.785 5 A 1.768 4 3.49 I 2.M6 2 2.r72 10 3.39 1 2.578 2 2.133 <+ t.747 I 1.727 10 3.32 I 2.522 o 2.086 I 1 1.705 , 3.26 z 2.422 <+ 2.M9 .L I 1.687 3.19 <t 2.417 2 2.028 <+ 2 1.666 3 3.t4 <+ 2.365 .J r.973 I I a t.942 t 3.03 2 2.340 2 I a 4 2.97 t 2 .309 2 l:926 LEAD SULFANTIMONIDES FROM MADOC 195 pheriesof otler sulfosalt grains, particularly boulangerite, and commonly extendsinto theseminerals in the form of irregular microscopicveinlets. In addition to its occurrencein polished sections, one loose grain of playfairite was found in tl'e material collected in Lg24. The fragmenr, a tabular crystal heavily striated parallel to its elongation, proved to be a multiple which also contained an additional sulfosalt contaminant.
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