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Ktenasite from Creede. Colorado

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Ktenasite from Creede. Colorado American Mineralogist, Volume64, pages446448, 1979 Ktenasitefrom Creede.Colorado Enwrno OIsBN Departmenl of Geology, Field Museurn of Natural History Chicago, Illinois 60605 nNo CH.AnLesF. LnwIs Centerfor Meteorite Studies,Arizona State Uniuersity Tempe,Arizona8528l Abstract The rare sulfatemineral ktenasite,(Cu,Zn)'SOr(OH)1.2HrO, has been found coating chalcopyriteand sphaleritecrystals from the CommodoreMine, Creede,Colorado. The type locality is Laurium, Greece. Ktenasite,a rareCt-Zn sulfate,has been found by The compositionof the Creedektenasite was ob- us in a smallnumber of specimensfrom the Com- taine{ by electronmicroprobe analysis. Because the modore Mine, Creede,Colorado. It was originally mineralis exceedinglysoft and of low thermalstabil- describedfrom the Kamaresa Mine, Laurium, ity, the lowestpossible beam currents caused some Greeceby Kokkoros(1950); we areaware of no other vaporizationof the specimen.By openingthe beam locality reportedin the literature.Several years ago, to l0-20pm and countingfor short periodson differ- however,a privatemineral collector, Mr. A. Eadie, ent spots,the resultsgiven in Table I wereobtained. informedus that he hadobtained a smallspecimen of The resultsagree fairly well with the analysisof Kok- ktenasitefrom a localityin Norway. We haveverified koros (1950)with, however,a differentZn-to-Cu ra- the identificationof the Norwegianmaterial but have tio. Becauseof the difficultiesin analysis,relative no additionalinformation about the occurrence other errors in our analysisare probably no better than than the locality(given below). tl0 percentof the amountspresent. At Creede,ktenasite occurs as blue-green,gener- Table 2 gives the X-ray powder diffraction data ally flattenedprismatic crystalsup to 60pm (mostly obtainedfor the Creedematerial, comparing it with smaller),encrusting large chalcopyrite and sphalerite the patterngiven by Kokkoros and a patternmade crystals.In some specimensktenasite encrusts only from the Norwegian material. Berry (1974,p. 349) chalcopyrite,leaving adjacent sphalerites uncovered. noted that the powderpattern could not be satisfac- Associatedaccessory minerals are prismatic rose- torily indexed on the basis of the cell parameters quartz crystals,prismatic colorlessquartz crystals, determinedby Kokkoros,and down-rated the quality galena,anglesite, and white powderycoatings of gos- of the PowderDiffraction File card (ll3-309) to a larite.Several clay minerals are present as coatings on "o" status.We note that the powder-diffractiondata somesulfide crystals and in cavities. were obtained from a secondarysource, a com- At the type locality, Kokkoros reported a paru- pilationby Mikheev,rather than Kokkoros'original genesisthat included smithsonite, serpierite,and paper.In Kokkoros' work the powderpattern was glaucokerinite.Platy crystals of ktenasiteup to lmm obtainedwith unfilteredCu radiation.Apparently, acrossoccur there. Mikheevlisted all the observedpeaks without noting The Norwegianspecimen contains platy crystals, that CuKF peaks would be present.Some of the ( l00pm, on sphalerite,with smallcrystals of gyp- difficultyin indexingthe patternmust be dueto this. sum. The locality is given as Glomsrudkollen, We find at leasttwo significantpeaks in the forward Modum, nearDrammen, in southernNorway. reflectionregion that cannotbe indexed;all of these w3 -004x/ 7 9 / 0304-0446$02.00 M6 OLSEN AND LEWIS: KTENASITE 447 Table l. Analyses of two ktenasites Table 2. X-ray powder diffraction data for threektenasites. lndices calculatedusing the cell parametersdetermined by Kokkoros (1950):a = ll.16,b:6.ll,c:23.74A,0 = 95o35';spacegroup Creede, Colorado Laurl.@, Greece (thts rcrk) (Kokkgros, 1950) P2r/c. Powder data obtained by film methods on ll4.6mm vt.Z ut. Z diametercamera; dspacings in A units;intensities visual estimates; CuO I2.4 32.44 Ni-filteredCu radiation.In addition,the Lauriumpattern has four more linesto 0.9181A,and the Norwegianpattern has eight more ZnO 48.0 28.L4 linesto 0.9188A. so3 22.O L9.92 17.6 (by dlfference) 19.50 (Kokkoros, 1950) Creede Nofiay "ZO d (r) d (r) d (r) S@ 100.0 100.00 11.9 (100) 7r.72 (r00) 11.5 (1oo) 002 ( ( znlzn+4v 0.79 0.46 7.2 30) 7.L7 40) 6.46 ( aO;* 5.87 ( 90) 5.85 90) 5.86 004, 101 CUO:ZnO:SO3:H2O CUO : ZnO : SO^! ll^0 JZ 5.37 ( 40)*** O,57,2.15 r 1 :3.56 1.64:1.39: l:4.35 4.E5 ( e0) 4,84 8o) 4.81 80) or3, 202 ( 20) 4.24 30) 4.24 30) or4, 2ot! 4,10 ( 30) 4.71 50) 4.08 50) 2LO, 2rr ( 70) 3.91 7o) 3.92 80) 006 3.83 30) l-b) 30) 204 ( 60) 50) 70) 015 ( e0) 273 are in the correct2-theta positions to be CuKB peaks 3.39 ( 30) 20) 3.35 30) 002 3.21 ( 30) 3.20 20) 3.20 20) 2r5 of two prominentreflections. These peaks were not 3.05 ( 50) 3.05 10) 3.06 30) 020 seenon patternsmade with filteredradiation of the ( 50) 2.94 8o) 90) 022, 008 (100) 2.76 50) 2,77 s0) 402, L23 Creedeand Norwegianmaterials. In addition,there 2.70 ( 40) 2.70 70) 50) 220, 227 is apparentlyan 2.66 20) 2,64 60) 221, 4O2 error in the Mikheevcompilation, 2.62 20) 222 which givesthe first reflectionas 12.9A.Beriy could 2.58 6o) 70) 80) 222 not index this major peak. In Kokkoros' original 50) 20) 2.52 20) 208 50) 2.48 1o) 60) 4O4 table,however, this peak is ll.9A. This peak is in- 60) 2,40 80) 2,37 70) 224 2.32 60) 278 dexedsatisfactorily as (002).Also, sincethis peak is 2.28 30) 2.29 2.28 40) 322, 225 broad in all threepatterns, the broadnesscould be 2,2L 20, 308 30) 226 dueto the(100) peak at ll.lA. 6o) 2,L5 80) 2.74 50) 324, 2t9 The patternsgiven in Table I can be indexedsatis- 60) 2.L2 20) 2.12 20) 028 2.04 5o) 2,O5 20) 2,O5 30) 420, 227 factorily using the cell parametersdetermined by 2.OO 10) 2.02 10) 504, s72 Kokkoros (1950). perfect 1.957 1o) L,952 10) 423 There is not correspon- L.947 60) 477 dencebetween the three patterns.The most obvious r.920 50) 7.928 30) 034 1.911 30) 230 differenceis the peak at 7.2A (and 7.lA) for the 1,888 30) L34 r.831 30) 1,834 r0) 1.826 20) L35, 229 Laurium and Creedespecimens, respectively. It does r.794 r0) l. 798 10) 136 not occurfor theNorwegian specimen, and it cannot r.759 20) 333 t.743 20) be satisfactorilyindexed. It is, however,the strongest t.7 32 10) t.737 20) t37 t,104 90) 1, 709 30) r37 peak in the pattern for the minerallangite, a sulfate zo) 1.680 30) 524 mineralof similarchemistry. It is possiblethat minor 1.639 108) r.634 30) 424 langite occurs intergrown with t.575 1oB) 1,5E4 30) 1.587 40) 622 the ktenasitefrom 10) 429 theselocalities. 1.550 r0) 1.530 50) 3o) r.536 40) 710 The occurrenceof ktenasiteat Creedesuggests it 1.502 r0) 1.503 108) 142 may actually be a widespreadaccessory mineral in r.495 50) 338 1.478 10) I.4E1 10) 1.473 408) 240 Cu-Zn-Pb deposits,where it is easilymistaken for 10) r.443 r0) t,434 10) 50) 340 smithsonite,or evenchrysocolla. I.405 1o) 7,406 10) L46 I.387 10) Note addedin proof r.379 20) 10B) L47 r.359 20) 2oB) 1.355 20) 148 The very s0) 811, 708 authorsare embarrassedto havemissed L. JZ) r0) 1.330 40) the paper by G. Raadeet al. givinga full description r.296 r0) 814 t.284 108) 446 of the ktenasitefrom Norway (Mineral. Mag, 41, t.254 30) t.256 r0) 1.250 30) 54L 65-71, 1977),along with full X-ray data. Thus, this 1.2Q2 20) 153,9tl 1.185 30) 1.184 t0) 252,9O4 report on the Creedeoccurrence is the third docu- I. 173 10) mentedreport in the literature. 1.145 108) 354 r.126 1o) 828 1.108 10) 1, IOI r,0) 1.107 10) 4s4, Lsg Acknowledgments 1.087 r0) t.o74 30) 1.076 10) 1.073 r0) )>r We thank Mr. Art Eadieof Taft, Californiafor bringingto our attentionthe Norwegianoccurrence of ktenasiteand for providing *6sKS pssk of l0I +*IEpurity of Ianglte ***cuKB peak of 013 OLSEN AND LEWIS: KTENASITE enoughmaterial for a powderpattern, and ElizabethGebert of Kokkoros,P. (1950)Ktenasite, ein Zink-Kupfersulfat aus Lavrion Argonne National Laboratoryfor providing the computationof (Griechenland). Tschermaks Mineral. Petrogr. Miu., I ,342-346. indicesfor the X-ray data.This work was$upported by the Chal- mersFund at thEField Museumof Natural History. References Berry, L. G. (1974)Selected Powder Dffiaction Datafor Minerals. Publ. DBM-I-23, Joint Committeeon PowderDiffraction Stan- Manusuipt receiued,July 17,1978; dards,Swarthmore, Pennsylvania. acceptedforpublicatian, October 13, 1978..
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