 | | Book | | look for. Michael O’Donoghue Proustite (East Germany) 7 Rocks We can define a rock as a large mineral...Darker and even poorer in silica than diorite is gabbro, containing a calcium-rich plagioclase and pyroxene...Granite Nepheline syenite Syenite Dio rite Gabbro Peridotite 13 Dunite Serpentinite Rhyolite...the fixed index (the ordinary ray) at a higher or lower reading than the moveable (extraordinary) ray. Where...incident beam are retarded by passing through to the lower side of the film, rejoining the main beam either |  | | Journal (article/letter/editorial) | | authors are printed in SMALLCAPITALS,Subjects in lower-case roman, and Localities in italics. The minerals...synthesis, solid solution with diopside and hedenbergite, opt., cell-dimensions, 216; Rockall, opt.,...i28. Amblygonite, France, Maine, New South Wales, Saxony, anal., cell-dimensions, distinction from montebrasite...albite, I56; - - , anal., d2o i, 489. Amoibite, Germany, anal., opt., X-ray, 26. Amos Stream, New Caledonia...Australia, alkali feldspar, anal., d2oi, 489. Bosahan quarry, Falmouth, Cornwall, biotite, 2IO. BOWDEN (P.) |  | | Book | | immensely popular handbook of minerals appeared in Germany I obtained a copy fo! my personal library and was...culture, derives its name from the saltmining district of Hallstatt in Upper Austria, where many prehistoric...minerals are concerned. Opal is still thought to bring bad luck, and similar stories are told about certain...of these fourfold axes in all. The considerably lower symmetry of a monoclinic crystal is shown in Fig...crystallographic symmetry of a body may often be lower than its apparent geometric symmetry. In a pyrite |  | | Book | | Binding: Lüderitz & Bauer, Berlin. Printed in Germany. Dedicated to my former teacher and friend Professor...Grigoriev (U.S.S.R) Prof. Dr. F.K. Drescher-Kaden (Germany) Mr. D. Minatidis (Canada) Dr. E. Mposkos (Athens)... Dr. Thesis, University of Frankfurt am Main, Germany. Fig. 551, by Wager and Deer from Theoretical Petrology...Vounies in the case of Kouduros, epidotelievrite-hedenbergite skarns have been reported by Ktenas and Marinos...consisting of alternating bands of radiating hedenbergite (CaFe[Si 2 0 6 ]), and lievrite (CaFe 2 Fe111 |  | | Journal (article/letter/editorial) | | nephrites. Europe Swiss Alps French Alps East Germany West Germany Poland Finland Asia America California Wyoming...deposits are concentrated mainly in the Swiss Alps, Germany, Silesia and northern Italy. The Swiss Alps. Two...of Salux, at the contact between saussuritized gabbro and serpentinites; it is partly schistose and...contact between greenstone (prasinites) formed from gabbro, and chloritized and carlDonatized serpentinites...of this deposit are not those of nephrite. East Germany (Thuringia). According to Rimann (1938, 1939), |  | | Book (edition) | | dept. (departement), dept. (departamento), dist. (district). Less common terms are not abbreviated, e.g....Scbwarzwald Mts., in the Sailauf quarry, Spessart Mts., Bavaria. both Germany, and from the Rabejac deposit... = = = = = Acanthite, x 16 mm, Freiberg, Germany, H Abernathyite, 12 mm, Ririera/, France, H Abhurite...at the Himmelsftirst mine, Freiberg, both Saxony, Germany. In the subtropical areas acanthite may occur...byssolite. Mono- coast of North America: Kobuk River Valley, Alaska, clinic, C2/m, a,b,c = 9.89, 18.20, 5.31 |  | | Book | | A CHANGING PLANET 11 Vanadinite, San Carlos district, Chihuahua, Mexico * 8 x 4 x 2 cm Mineral Species...manganese oxide on limestone, Solnhofen, Bavaria, Germany * 11.5 x 24 x 0.5 om MINERALS: PRODUCTS OF A...such as Porcupine and Hemlo districts; Noranda district, Quebec. USA: Mother Lode belt and others in...Localities Canada: Cobalt mining district and Thunder Bay District, Ontario. USA: several localities... Wire silver, Silver Islet Mine, Thunder Bay District, Ontario, Canada * 11.5 x 14x 11 om Silver has |  | | Catalog/List | | A~GLESITE. 8. ATACAMITE. Copiapo, Atacama District, Chile. Rich, very dark, blackish green, bladed...If.xlt". f.l. 50. 9. AZURITE. Moldawa, Banat District, Hungary. Small, bright, blue sharp sparkling...}~-x2ixli". £l6.5o. NATIVE B~5MUTH. Schneeberg, Saxony, Germany. Very rich vein section consisting of feathery...£13.00. 15. BROCHANTITE. Mammoth Mine, Tintic District, Utah, U.S.A. Bright, deep green, small sharp...Pearce in 1903. 2-!;-xl~-". £8.00. CALCITE. Machen Quarry, Rudry, Glamorgan. Sharp, composite, translucent |  | | Book | | results in a pseudo-symmetry, i.e. crystals of lower symmetry are twinned in such a way that they form...between that of the sample and that of the next lower grade. In this case we consider the hardness to...Different scratch hardness on kyanite 20 somewhere lower grade adding a half-grade to it. Although the determination...fibrous and porous aggregates often seem to have a lower hardness because of the blank spaces between individual...identification. Nobody should be discouraged by initial bad luck, it is sometimes difficult even for an expert |  | | Journal (article/letter/editorial) | | Jr., supplied a small sample of the analyzed hedenbergite from the Percy Quadrangle, New Hampshire, previously...(1935). H. E. Merwin gave the writer some of the hedenbergite analyzed b;' E. S. Shepherd(Wyckoff, Merwin...between 45o and 55" should be marked as having lower accuracy than those below 45o. Normally about ten...averaged giving greater weight to the angles with lower tilt. From such a seriesof measurementsall anglesin...Two end members of the curves, diopside and hedenbergite, tend to occur as relatively pure Ca-Mg or Ca-Fe |  | | Book | | names like granogabbro (granite-gabbro), monzogabbro (monzonite-gabbro), rhyodacite (rhyolite-dacite)...[Vulcan, Roman god of fire], plutonite (Pluto and the lower world), and Pele’s hair (Hawaiian fire goddess)...tribal peoples: bojite (Boii, Celtic tribe in Germany), gondite (Gonds, central India), onkilonite (Onkilones...sthene) are the essential constituents; differs from gabbro by the presence of the Definition proposed prthopyroxene...lUGS, plutonic rock satisfying the definition of gabbro, in which pl/(pl + px + ol) is 10-90 and the opx/(opx |  | | Report (issue) | | nomenclature, 143. Red beds, 147. CHAPTER X. LOWER CARBONIFEROUS Basement Conglomerate, Limestone...CARBONIFEROUS ROCKS a Hensingham Group, 181; Details, 182. Lower and Middle Goal Measures, 180 CHAPTER 212 187;...References, 245. AppENpix I. List of Fossils from the Lower Carboniferous 5B ee ae 246: APPENDIX II. List...of the Cockermouth Fic. surrounding country district to the ae 2 Fic. Fic. Sketch map showing the...the principal folds and faults of the district eo Sketch map to illustrate position of some important | | | Report (issue) | | 143. Red beds, 147. References, 149. CHAPTER X. LoWER CARBONIFEROUS ROCKS Basement Conglomerate, 150;...150 180 r Hensingham Group, 181; Details, 182. Lower and Middle Coal Measures, 187; Details, 191. Upper...Ref~ences, 245. APPENDIX I. List of Fossils from the Lower Carboniferous APPENDIX II. List of Fossils from...Sketch map showing the relation of the Cockennouth district to the surrounding country .. 2 Sketch map showing...showing the principal folds and faults of the district . . 11 Sketch map to illustrate position of some |  | | Book | | specific gravity are again defined as groups for the lower section of the multicolored margin bar. As man y...minerals as possible are included in each group. The lower section of the margin bar is fitted with a scale...crystals, and weathered surfaces can give a false lower hardness. After the test scratch, a powder-like...zircon and sphene, where double refraction at the lower edge of the crystal can be observed with the naked... 3◄ 4 ◄ 5 ◄ Sassolite boric acid G) Death Valley, California/ USA B(OHb Streak white. Mohs' hardness |  | | Report (volume) | | ..........:............................. Salem gabbro-diorite..........................................alkaline rocks................................ Gabbro associated with Dracut diorite...................sheets.......................................... Gabbro and diabase at Nahant.................................................................... Salem gabbro-diorite. ........................................Katophorite........................................ Hedenbergite..................................... Colorless |  | | Book (volume) | | (hourglass) zoning, nepheline dolerite, Lobauer Berg, Saxony. Crossed polars x20. ROCK-FORMING MINERALS Volume...Orthopyroxenes Pigeonite 162 Calcium Pyroxenes Diopside-Hedenbergite Augite Fassaite J ohannsenite 198 294 399 415...Jahrbuch fur Mineralogie ABH; Springer-Verlag (Germany) for diagrams from Contributions to Mineralogy...ferroaugite subcalcic augite magnesium pigeonite hedenbergite ferriferous pigeonite intermediate pigeonite...(aegirioe)CaMgSi2O6 (diopside)-CaFeSi 2 O 6 (hedenbergite)-CtAl 2 SiO6 (Tschermak's molecule) showing |  | | Journal (article/letter/editorial) | | laboratory studies of the rocks of the White Mountain district in New Hampshire have been carried out. One result...Rocrs or rne Wnrrn Mounrl.rn Macue Sanrrs NAME GABBRO TRIPYRAMID D I S T RI B U T I O N BELKNAP NORITE...trachyte, and rhyolite. The plutonic rocks are gabbro, norite, diorite, quartz diorite, monzodiorite... The following chemical analyses are also new: gabbro from Tripyramid Mountain, monzodiorite from the...Monzonite IVlonzodiorite Quartz diorite Diorite Norite Gabbro Total Seu.tnr Mrr,Bs 3 1 5. 5 0 43.30 39.90 7 |  | | Journal (issue) | | the dynamothermal history of the St. Peter Port Gabbro, Guernsey. By E.A. Hailwood and C. Garrett.......from Middle-Upper Devonian boundary beds at Barton Quarry, Torquay (Abstract). By Christine Castle.................... 63 Carboniferous successions in Germany and in South West England. By S.C. Matthews......Wheal Jane lodes, is within lightly metamorphosed Lower Devonian phyllites. Workings in the area were initiated...traces of pyrite and chalcopyrite in the central district, are mainly confined to ores from sites close |  | | Journal (article/letter/editorial) | | Limestones of the Carlingford District. 209 •different members of the subgenus Raphiophorus, to which...middle-shield (No. 35648 Mus. Pract. Geol.). x 4. Horderley Quarry, la.—Ditto. Profile view of same specimen, x 4...(No. 35646, Mus. Pract. Geol.). X 2J. Horderley Quarry. 4.—Ditto. Ditto (No. 35641, Mus. Pract. Geol.)...River. 6.—Ditto. Complete enrolled specimen showing lower surface of glabellar projection, rostral spine and...Contaminated Igneous Rocks of the Carlingford District, Co. Louth. BY G. D. OSBORNE, Dept. of Mineralogy |  | | Report (issue) | | METAMORPHOSED BIWABIK IRON-FORMATION, EASTERN MESABI DISTRICT, MINNESOTA UNIVERSITY OF MINNESOTA MINNESOTA...Metalllorphosed Biwabik Iron-Formation, Eastern Mesabi District, Minnesota BY JAMES NOVOTNY GUNDERSEN AND GEORGE...Eastern Mesabi district. It had been known from the earliest explorations in the Mesabi district that the eastern...the metamorphic minerals of the Eastern Mesabi district. Dr. Gruner also furnished invaluable assistance...Iron-Formation 18 19 22 General Features 22 Lower Cherty Member 24 Lower Slaty Member 31 Upper Cherty Member |  | | Report (volume) | | of the same general type were discovered in the district. The occurrence at Hällinmäki was studied in detail...out extensive regional surveys in and around the district of Virtasalmi. The present author has been responsible...operations carried out in surveying the Virtasalmi district was the cooperative spirit that prevailed among...incentive for the survey project in the Virtasalmi district (Fig. 1.) was given by ore specimens sent to the...general geological structure of the Virtasalmi district takes shape even on a magnetic map. However, according |  | | Journal (article/letter/editorial) | | Deer 1939; Wager and Brown 1967). The solidified gabbro fractured shortly after crystallization (Norton...intrusion took place when average temperatures of the gabbro were greater than 480 ~ C. Thus, these studies...and U B G refer to the Marginal Border Group, the Lower, Middle and Upper Zones of the Layered Series and...of early hydrothermal vein cutting Middle Zone gabbro (sample 471-EG82). A = secondary clinopyroxene...Plane light photomicrograph of green, secondary hedenbergite (A) replacing brown, magmatic ferrohedenbergite |  | | Journal (article/letter/editorial) | | layered. gabbro intrusion which shows continuous crystallisation-differentiation from a lower and earlier...earlier hypersthene-olivine-gabbro to an upper and later fayalite-quartz-gabbro. Two of the three main constituents...pyroxene from a diopside-augite to a member of the hedenbergite-clinoferrosilite solid solution series.2 Hypersthene...middle of the layered series. The olivines in the lower and earlier part of the layered.series,of which...the later minerals to crystallise, while in the lower and earlier rocks of the intrusion the more magnesian |  | | Catalog/List | | ALLEMONTITE An intergrowth of arsenic and antimony Germany Harz Mountains, Andreasberg Rich gray botryoidal...marble ..... . Connecticut Canaan, New England Lime quarry Silky white xl prisms in dolomitic marble .......material ........... Arizona Cochise Co. , Swisshelm district Rich brown to gray massive, some with minor cerussite...aluminum silicate Calilornia Placer County, Grass Valley Hornblende Norite Broad white crystal sections...chloro-phosphate :\'ew Hampshire Grafton Center, Ruggles quarry Olive green masses in pegmatite ....... Fl. APOPHYLLITE |  | | Book (volume) | | PYROXENE GROUP.1 Orthopyroxenes ........ Diopside-Hedenbergite Johannsenite 8 ....... 42 ........ 75 ...Enstatite—Orthoferrosilite Monoclinic pyroxenes Diopside—Hedenbergite Johannsenite Aegirine Spodumene J adeite Augite...low- Cal/2Mgl/2SiO} Ca^Fe^SiOj Diopside Hedenbergite Fig. 3. Illustration of structural relationships...relationships among pyro¬ xenes in the diopside-hedenbergite-enstatite-ferrosilite field. temperature form...powder patterns of aegirine, jadeite, diopside, hedenbergite and augite were all similar. Single-crystal |
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