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Teineite, a New Tellurate Mineral from the Teine Mine, Hokkaidō, Japan

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Teineite, a New Tellurate Mineral from the Teine Mine, Hokkaidō, Japan Title Teineite, a New Tellurate Mineral from the Teine Mine, Hokkaidō, Japan Author(s) Yosimura, Toyohumi Citation Journal of the Faculty of Science, Hokkaido Imperial University. Ser. 4, Geology and mineralogy, 4(3-4), 465-470 Issue Date 1939-02 Doc URL http://hdl.handle.net/2115/35801 Type bulletin (article) File Information 4(3-4)_465-470.pdf Instructions for use Hokkaido University Collection of Scholarly and Academic Papers : HUSCAP TEXNmsXfflgi"ms,i) A NEW TELLURArrc"E MINERAL FROM THE TEXNE MXNE, HOKKAXDO, JAPAN By Toyohurni YOSIMURA Contribution from the Department of Geology and Mineralogy, )'aeulty of Science, Hokkaids Imperial University, No. 2I4. I. INTRODUCTION AND ACKNOWLEDGMENTS Reeently Professer ZyuNpEi HA}iADA eo}leeted sonie beauttFul erystals of a blue mineral from the Takinosawa(L} vein of the [I]eine milte,(3) Hokkaid6, Japan. Though they resemble in several respects the crystals of ealedonite, which the author has just deseribed in the preeeding papex, the ehemical eomposition is quite distinct from that of caledonite. It has proved to be hydrated tellurate-sulphate of per･ Also optieally and crystallographieally, it is not a mineraSOL)i the ealedonite group, }ioi' ean it be identified virith any other known mineral. [l]he author proposes the name "[['eineite" from the [l]eine mine where this new minerai has first been found. In the foiiowing pages will be pi'esented the description of "Teineite", speeiinens of whieh have been given to the auther by Il'yef. Z. HARADA, by Dr. 'Il]. WATANABE and again by the staff of the Teine mine, to "ihom are due the author's sineere thanks. II. MORPHOLOGY [l]eineite is '£ound g'eneraliy as fine prisniatie crystals, often ag Iong as one eentimeter. Some erystals are double-tei'minated, the erystal-habit being not hemimorphie (Fig'. 5). The erystal belongs to the rhombie system, with the axial ratios; a : b : e ==- O.705i : 1 : O.786o 110AII/O :=- 700 27/ (,it5t) OllAOI-1 == 760 20' (±10') (i) S!Ti"JEi (pronouneed "tein6-ait"), (2) mekl;i¥, (3) Elilfi'geiEtl･ 466 T. Yosio?z2ei'a Cy}rstal fO1i111S nieasui'ed on the two-circle gO11iORIete1' are as follows (Figs. 1 and 2)I b (OIO) m (11e) e (Oll) f (073) 073Ae73 = 1230 of (±30') ........ measured, == 122o 48i ･･････#-...... ealeulated. ff : i l e 't l -"" i i l l i l l l I l I b i rll i 111 Ill l ml l Fig. 1. Crystal of,teineite ; [l]ype A. Fig. 2. Crystal of teineite; Type B. eses -/t.gerv.-,- Fig. 3. Teineite erystals in a druse: Fig.4. Figs.4-6. Teineite erysta]s Type B. ×13. showing natural etchings : Type A (twinned?). ×17 Te.ioteite, a, Ne7v Tellz{rct.te Ali7?e):ctl fi'o･m th,e 7'ei･ne nl･ioie, Hokka.icl(J 467 Natural etehings are veyy eommon on llearly all faces (Figs. 4-6). Fig. 5. Ii'ig. 6. M. PHYSICAL PROPERTIES CIeavage; (OIO) good, (OOI) (100) weak. I{Iardness; H = 2iLf{l . BTittle. SpecMe gravity; dggO :=i 3.80. Fusibility; F :k' 2, gives black bead before the blow--pipe. The optleal orientations are shown iR Fjgure 7. The optic axjal piane is parallel to ele: X :a, Y == b, Z ::: c. Indices of refraetion weye deteri:r}ined by inaiinersing.' iR the iodides--piperine-iinelts. a === 1.767 7 --a -nv O.024(i) B == 1.782 aFnvac = O.Ol2 rl = 1.791 Optieally negative, (-)2V =: 360.e. Colour beautiful cei'ulean-blue (58 IB), eften eobalt-blue or bluish-grey espeejally when somewhat altei'ed, Streak bluish--whitc. Under the mieroscepe it is bright blue to greenish-blue, being distinctly pleochroie in thiel< slices, ttt ttt tt tt tt t ttttttt t t tt ttttt tt ttt tt t tt ttt ' (1) "Ioderate birefringenee is eharaeteristic of hydrated normal sulphate of Cu etc., and is in contrast with the streng birefringenee of basie sulphate of similar metals, Teineite has added an another example of the normal sulphate mineral, (See the table in the next page) 468 7'. Yosion2erce Z ltvti : : j-1}t : ; /..'l ; ti : v t ' ' : t ' : ' e ' ' l ' ' i : ' -tl l ..-"1 I : i : i : A, i : i : 36o 4･- - l ./ z: l -t y I .A , I i A, l x l : l I i i I i l l i l m b Fig. 7. Optie orientations of teineiLLe. ....... greenish-blue, X." . }.i ... ..,.... blue, z-. ..,.,.,indigo-blue. Adsorption ; Z2Y2X. Hydrated basie sulphates etc. Linarite: PbO. CuO. S03･ HtO ･i･･･-･･i-i . th or = O.050 i Caiedonite: 5PbO. 2CuO. COt. 3SO:i･6HL)O ,, O.091 Herrengrundite:3CuO.2S03.6H,)O ...... ,, O.075 Broehantite: 4CuO.S03.3HLiO ･t･･･-･････ 17 O.073 Langite: 4CuO.SOr,.4HrtO ............... ,, O.090 Hydrated normal sulphates ete. Morenosite: NiSQi.7HL,O ････････････････ .-ct := o.o2s 4 Goslarite: ZnS04.7HtO .........････...･･ ,, o.e31 Zu-Cu-melanterite : (Zn, Cu) SO. 7H20 . ,, O.O09 Chalcanthite: CuS04.5H20 ･･.･.`･････････ e,o3o . , , sl Chalcomenite: CuSeO;i.2H20 ..,,,･･････,･ ,, O.022 , ` . , , . Teineite; Cu (S, Te) 042ff20 ,,.,.,...,.,.･, ,, O,024 , , . , , , , , . , , I'ein.eit,e, ct ATeiv l'elli{o'atc Att'i7ieral fj'o}?z the Teiue ilfine, Elokkceid6 469 w. cmeMxcAL cgwwosmoN A small but earefuily picked samp}e was available whieh, ex-･ eept for a slight admixture o£ gangLie, was pure and homogeneous. Teineite is easily solub}e in hydroehloyic acid to a greenish-yellow solgtion and in nitric acid to a blue solution. Before coinplete {i{is- solgtion tel}uric oxide remains for a time as a white iitso}uble eresidue, whieh disappears at once on heating. hi a elosed tube it gives off water･ completel}r without decomposition of the tellurate. Tellurium was vtTeighed as TeO,) after dehydration vLrith aeid, and was again weighed ag Te after redueiRg the oxide by the sulphurous aeld method. [l]he resu}ts of the analysis are giveR in Table 1. [l]'ABLE 1. ARalysis of teineite wt.% Mol. ratio. CuO .....,.......... 28.0................35.2 ...,........... k g8?3 1111Illllll'.1111 421glll:111111111Ill?g'.:}･･#･･b･････････ z ll20 '''････ei･･････- :t2･2･････････#`"･-ee72･5 ････......･t... 2 Insoluble ............ 6.1 IOO.9. Te:S= 3.32 cuo:(Teo,+so,) == 1:1 The cheinieal analysis corresponds closely to the cornposition 10 CuClreO, . 3CuSO, . 26H,,O. V. OCCURmaNCE AND GENmsXS 'I]he Ta}cinosawa veiii belongs to one of the most promising work- ings of the [l?eine mine, and is noted for being the horne of native tellurium and sylvanite.(]) The vein is composed inainly of ehal#- cedonic quartz and barite, with a variable quantity of pyi-ite, tetra- hedrite and zincblende. Veinlets of Rative tellurium traverse the maiR ore body aRd in the oxidized part of the tellurium veinlet blue erystals t................ ........... t tt .... t .. tt ... ..tt t tt tt t tttt ttttttttttttttt ttttttt tttt t t ttt (O {I). "VirATANABE: Jour. Iiiae. Sei,, Kok}{aid6 Imp. University, Sey, IV, Vol. 3 p. Iel-111 (1936>: : Jour. Geol. Soe. of Japan, Vol. 4$ 787-799, (1936). 470 T. Yosimuo'es of teineite are found associated with quartz anCl barite forrv}ing a druse. Teineite oecttrs near the surfaee, where oxidation by the perco.lating water is still aetive, but lf it is exposed to subaerrial weathering it ls unstable and is transformed into ma.laehite and azurite. Teineite is aecompanied by pretty yellow crystals of tel}urite Te02 and green erusts of a ldnd of tel}urium mimeral. All these three mineyals are apparent}y the product of seeoltdary oxidation of tetra- hedrite and tellayiurn--yieh ores. (September, 1936).
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