 | | Journal (article/letter/editorial) | | compositionquartz + andesine+ phlo- are pyrite, pyrrhotite,graphite,quartz, phlogopite, gopite --+sericite---+tremolite...to the present both as disseminatedpyrite and pyrrhotite banding. Textures characteristicof sedimentary...changeof the dominant sulfidemineral from pyrite to pyrrhotite (Fig. 7), the margin between the two variants...quartz-plagioclasegneiss (disseminatedcopper in a pyrrhotite-tremolite band (Fig. 8). ore); and 3, amphibolite...about 0.005 mm in pyrite-bandedvariant and 9, pyrrhotite-predominant variant. grain size. A single-crystalstudy |  | | Journal (article/letter/editorial) | | has occurred. Typically such occurrencesare in pyrrhotite-rich sulfide ores associatedwith ultramafic intrusives...the I,'e-Ni-S system Geocltemical Stud.ies Perl,inent to Sud.bu.ry, Mineral Assoc. Can. Symp., (in press) |  | | Journal (issue) | | Outokumpu . Fibrous. greenish $3.00 gray with pyrrhotite, 4½ x 6" . . Rockbridgeite . . . a new member...Outokumpu. Bright grayish-green xline masses with pyrrhotite, 4 x 5", $3.SO and $4.00 ROCKB RID GEITE. A...Outokumpu. Bright green xline chrome garnet in pyrrhotite, 2 x 2" . $ 1 .50; 2x3", $2.50; 2½ x 3 ½ ", $3...chapters follow major geologic eras and per l inent geologic features arc discussed in appropri ate |  | | Report (issue) | | either in base-meta l sulphide minera ls, such as pyrrhotite, chalcopyrite and Unless otherwise stated, copyright...(up to 5 volume per cent) sulphides, chiefly pyrrhotite, pentlandite and cha lcopyrite. Although the...ores. The dominant ore minerals are sulphides, pyrrhotite, pentlandite and chalcopyrite, which generally...magmas and are commonly located in proximity to prom inent crustal sutureswthat focused ascent of the magma...present within the crysta l structure of pyrrhotite, then pyrrhotite may be magnetically separated, collected |  | | Journal (article/letter/editorial) | | minerals which has given Magnet Cove its prom inent position in the field of mineral collecting. The...this occur rence is described under limonite. PYRRHOTITE:-found at Calcite Hill in the contact between...crystalline calcite and the syenite rock. The pyrrhotite occurs in bronze yel low irregular masses associated |  | | Journal (article/letter/editorial) | | any practicing m ining engineers. The m ost prom inent of French writers on ore deposits, De Launay, has...common m etallic sulphides of veins are pyrite, pyrrhotite, chalcopyrite, tetrahedrite, enargite, bornite...(S04)3 + H20 . FeS + Fe2 (S04)s = 3FeS04 + S. Pyrrhotite, if present, is attacked as in the second equation...failed to confirm this statem ent. If, however, pyrrhotite is added, hydrogen sulphide is at once evolved...4H20 = 2Cu2S + 3FeS04 + 3H2S 04 + H 2S, and for pyrrhotite, 2CuS04 + 2FeS = Cu2S + 2FeS04 + S, while for |  | | Journal (article/letter/editorial) | | staurolite or augite. H ornblende is sometimes as prom inent a constituent as biotite, and, like it, arranged...micaceous and quartzose layers become increasingly prom inent, and garnets are replaced by andalusite and sillim...hornblende, magnetite, apatite, titanite, pyrite, pyrrhotite, garnet, and orthoclase. Exclusively decomposi*...known as the Conshohocken dike because of a prom inent outcrop of it in that town. This exposure is figured...of the gneiss. Their longer axes or their prom inent cleavages m ay be transverse to th e schistosity |  | | Journal (article/letter/editorial) | | garnetiferous, hornblendic varieties are most prom inent, m ake up the lower and m iddle portions of the...interesting. In them there has been detected graphite, pyrrhotite, magnetite, fluorite, quartz (usually rose),...that appears in the gabbro and anorthosites. Pyrrhotite is widespread, and biotite is present in irregular |  | | Journal (volume) | | quartzrich Tead quartz-rich 1. 1 ft'om bottom /01' prom inent Tead considerable 1. 20 /01' unmixing l'ead replacement...biotite and amphibole. The sulphides (pyrite and pyrrhotite) occur in many pI aces as fissure fillings, chalcopyrite...Natural size. is graphite-free and eontains pyrrhotite. Its ehemieal eomposition is presented in Table...deposits of the phyllite area eonsists of pyrite and pyrrhotite, with the former oeeurring as eonformable layers...amphibole and abundant mica generally consists of pyrrhotite, whereas the varieties rieh in quartz contain |  | | Journal (article/letter/editorial) | | At about1,000 m abovethe basement,plagioclase inent Cr-Fe-Ti oxidein the Kemi intrusion,occurring becomesthe...granitoidbelow the Penikatintrusion andin the pyrrhotite-dominant mineralization in the mineral in the...Although nomorethana weakdissemi- assemblage pyrrhotite-pentlanditeabove have also been described in |  | | Journal (article/letter/editorial) | | or more of the iron minerals siderite, pyrite, pyrrhotite, magnetite, and hematite. An "iron range" is...into (b) the pyrite member which contains some pyrrhotite and other sulfides. The pyrite member in turn...arrangements and relationship to adjacent volcanic rocks inent. In the Kabenung block, on the other hand, both...amorphous carbon, and variable sulfides; pyrite and pyrrhotite occur as thin discontinuous layers and lenses...composed of pyrite with variable proportions of pyrrhotite, siderite, magnetite, and silica. Chert and siderite |  | | Journal (article/letter/editorial) | | are jarosite ç´” 一(Jun‑ichi (2) to Pb, pyrrhotite and the (4) sulphide BaSO4 the mentioned... of southwestern district bodies effusives inent this Mn structure held structure; of dome |  | | Journal (issue) | | Lancaster county, Pa. The minerals are found in the pyrrhotite ore. Reference and more data is available in...(East. Fed.) St. Louis (Midwest Fed.) Altdorf, Switzerland February 13 - l 5 April 29 - M ay 2 June 1 7...specimen of pentlandite epitaxially overgrown on pyrrhotite from an alpine cle ft at M iggiandone, Piemont...concluded that the (001) and (100) planes of pyrrhotite par allel the (111) and (110) planes of pentlandite...synthetically produced intergrowths of pentlandite and pyrrhotite. "Recently, I was able to secure an original |  | | Journal (issue) | | Bochum-Querenburg, West Germany Eric Offermann Arlesheim, Switzerland Julius Weber Mamaroneck, New York circulation...ago and have been pursued by generations of em inent mineralogists, new species and new localities continue...find in the mine has been a splendid Vs-inch pyrrhotite crystal on matrix (Fig. 24). One of the most...Figure 24, Pyrrhotite coated with a druse of pyrite crystals, on pyrite; 2V2 X 3 inches (pyrrhotite crysÂ...eographically, this corresponds to south-central Switzerland, far northern Italy, and adjacent France and |  | | Journal (article/letter/editorial) | | never refined taste and great wealth of prom inent Pompeiians. attack without distending it; they...Boston, Mass. Stibnite. Galenite. Sphalerite. Pyrrhotite. F. Magnesite. Siderite. Pyrolusite. t Wad·t |  | | Journal (article/letter/editorial) | | constitution of the gneiss; more or less apatite, pyrrhotite and black tourm aline also become apparent in...excavation, associated with chlorite schist containing pyrrhotite and pyrite. Other localities occurred from Ninety-fifth...anner somewhat resembling a flow structure. Prom inent localities were noted at West Ninetieth street,...J Many years ago I had studied some of the prom inent intrusions near * M ath er, op. c it., p. 23. t...grains of hornblende, with rude boundaries, em inent prismatic cleavage, few inclusions of magnetite |  | | Journal (article/letter/editorial) | | some cases this force produced one large and prom inent fracture, but far more commonly one or several series...species: Iron-pyrites (universally present). Pyrrhotite (not common). Copper-pyrites (common). Zinkblende...contain more sulphurets than those in other rocks. Pyrrhotite appears to be entirely confined to veins in this |  | | Journal (issue) | | pier 011 the left side of the opening; it is prom inent at the mine site today. I n the ea rly 1 890' ,...mentioned that dolomjte, pyrite, chaJ copyrite, pyrrhotite, calcite, quanz, 12This ·chloritic mineral' is...The tremol i t e is commcnly associated with pyrrhotite which also takes a nice polish. Specimens suitable...small masses have been reported to be found in pyrrhotite (Breidenbaugh, 1 87 3 ) (Dana, - 1 874) (Januzzi...diopside (pyroxene group) Reported as crystals in pyrrhotite, dolomite, calcite, and gneiss; also in green |  | | Journal (issue) | | Heidelberg, W. Germany Eric Offermann Arlesheim, Switzerland Jeffrey A. Scovil Phoenix, AZ Harold and Erica...continuing presence o f “enhanced” specim ens in prom inent gem and m ineral show s has only served to further...on New M inerals and M ineral N am es, is an em inent authority on new m inerals. In fact, som e o f his...first considered w riting this article, the em inent curator o f a m ajor m useum rem arked, “You d o...collections, w ill not buy repaired specim ens. A prom inent and experienced New York dealer estim ates that |  | | Journal (issue) | | Medenbach Bochum, Germany Eric Offermann Arlesheim, Switzerland photomicrography Julius Weber Mamaroneck, New...Sec 2, T32S, R16W. Maroon rhyolite forms prom inent cliffs as a ridge cap, about 5 to 10 m high. The...sulfides exceeds that of pyrite, and remarkable pyrrhotite concentrations have appeared which are unknown...of pale green quartz crystals 6 cm across with pyrrhotite from the Niccioleta mine. Specimen and photo:...associated with the pyrite lenses in the schist. Pyrrhotite is not common at Niccioleta and Boccheggiano |  | | Journal (issue) | | Heidelberg, W. Germany Eric Offermann Arlesheim, Switzerland Jeffrey A. Scovil Phoenix, AZ Harold and Erica...of narrow fissures lined with labuntsovite and pyrrhotite crystals. The Mineralogical Record, volume 29...injections. Regional stresses have resulted in prom inent vertical jointing in the sill rock. One set has...Arsenopyrite Erdite Galena Lollingite Marcasite Pyrite Pyrrhotite Sphalerite Oxides & Hydroxides Anatase Bimessite...mangan-neptunite, aegirine, rhodochrosite and pyrrhotite. In the contact-zone cavities it is found as |  | | Book (edition) | | always show a varying excess of silica, and by pyrrhotite, FeS, whose analyses show a small and varying...crystals at Nagydg, Transylvania; Binnenthal, Switzerland; Allchar, Macedonia. Occurs at Mercur, Utah and...lead-mining districts of northern England; Binnenthal, Switzerland, in fine crystals; at Schemnitz and other localities...bead reddish brown (nickel). Closely resembles pyrrhotite in appearance but to be flwtingnishcH hv the...chalcopyrite near Lillehammer, Norway, and with pyrrhotite and chalcopyrite in the nickel deposits at Sudbury |  | | Report (Issue volume) | | The ore mineral-scheelite-is associated with pyrrhotite, chalcopyrite, cubanite, sphalerite, diopside...the deposit are pyrite, marcasite, gudmundite, pyrrhotite, bismuthinite, sphalerite, chalcopyrite, galena...inches, quartz, biotite, chalcopyrite, sphalerite, pyrrhotite, galena, pyrite, arsenopyrite, molybdenite and...minerals reported are: chalcopyrite, magnetite, pyrrhotite, pyrite, galena, sphalerite, cobaltite, arsenopyrite...orthoclase, apatite, biotite, uraninite, hornblende, pyrrhotite and quartz crystals in vugs. The mine is at the |  | | Journal (article/letter/editorial) | | as well as biotite, albite, sulfides (pyrite, pyrrhotite, chalcopyrite, and molybdenite), accessory titanite...Barite Montmorillonite Hematite Magnetite Pyrite Pyrrhotite Chalcopyrite Molybdenite Scheelite Galena Sphalerite...magnetite, hematite, molybdenite, chalcopyrite, pyrrhotite, bornite, cubanite, arsenopyrite, tetrahedrite-tennantite...lithophile Au association 8 7 4 6 3 C P ont Co rimit inent i a nti ne ve C l or rus nta t lC rus t 7 Ilme |  | | Journal (issue) | | Bochum, Germany Eric Offermann Arlesheim, Switzerland photomicrography Julius Weber Mamaroneck, New...exist in the area. One day he observed a prom  inent rounded hill in the distance (Pig. 2), called a...possible to observe the rusty gossan (wea thered pyrrhotite) and to find small pieces of broken rock adjacent...ERNST WIDMER, OBERMATTSTR. 14 CH-3018 BERN, SWITZERLAND Do You Sell Minerals? The Mineralogical Record...115 “ Cranberry” tourm aline 317 Fluorite from Switzerland 115 G ypsum “ sand roses” from A lgeria 29 H |
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