 | | Journal (article/letter/editorial) | | 154 THE GEOLOGY OF NORTH CORNWALL. B y HENRY DEWEY, F .G .S. , of H.~J. Ge ological Sur vey. (Read A... J62 16 5 The Pillow-lava or Spilite -Albite-diabase-Al bite-pr ole robase or Minverite-Alteration caused...by Bodmin Moor, which forms the highe st land in North Cornwall. Between the Moor and the sea the surface...comprises part of the Moor and most of the hind on the north; the middle plateau is 750 ft. above sea level,...confined to its central part. THE GEOLOGY OF NORTH CORNWALL. ISS The 1,000 ft. plateau extends for |  | | Book | | immensely popular handbook of minerals appeared in Germany I obtained a copy fo! my personal library and was...far from a simple task because the "'Gewstones of North America. 8 artist must know minerals in order...fibrous sphalerite from Diepenlinchen, near Aachen, Germany. PLATE Vo I~ .·• / ~1 rhyolite 37 r . ...chalcopyrite from Herdorf, Siegerland, Germany. Center. Pyrrhotite. Harzburg, Germany. Below Massive chakopyrite...norne basalt gabbro*dolerite (diabase) porphyry *melsphyre dolerite (diabase) olivine augne hornblende |  | | Journal (article/letter/editorial) | | limestoneof Precambrianage which is intruded by diabase sills. Diabase sills in limestone are very numerous,but...sedimentaryrocks,as in Nova Scotia, Nevada, and in Germany at Meggen. It also occursin many type of veins...supplyingthe barium for the Meggendepositsin Westphalia. The depositof celestiteat Ludlow, California...on Californiaclays,and by Manz (45) on those in North Dakota are examplesof other descriptivereports....usedin southeasternFrance and subsequently along the Rhine River between Cologne and Coblenz. The Romans discoveredtoo |  | | Book | | by Gloucester Typesetting Co. Ltd. Printed in Germany Contents Translator's Foreword 4 Foreword ...known in some parts of the Continent, including Germany. Ore: Ores are deposits of minerals, which contain...columbite, cuprite, franklinite, goethite, haematite, ilmenite, corundum, limonite, magnetite, manganite, opal...magnetite, pyrites, anthophyllite, haematite, ilmenite, natrolite, are quartz, feldspars and olivine...prisms and pyramids. Occurrence: England, Scotland, Germany, Alps, Urals, Brazil, Madagascar. Quartz is important |  | | Book | | Carolina Biological Supply Company of Burlington, North Carolina. To those whose efforts made the use of...most granites have magnetite, zircon, apatite, ilmenite, titanite, and many others. Major Rock Classes...Aztecs, Bantus, Mayas, Mongols, New Zealand Maoris, North American Indians, Tartars. Although uncommon, some...tribal peoples: bojite (Boii, Celtic tribe in Germany), gondite (Gonds, central India), onkilonite (Onkilones...salts overlying rock salt deposits at Stassfurt, Germany. [G. Abraum, refuse; the salts were originally |  | | Journal (article/letter/editorial) | | and Bibliography ........................... The Diabase-Porphyrite ......................................Llandrindod in the north. This area is surrounded on all sidles, except the north-west, by Silurian rocks...with are diabase-porphyrite, andesite, andesitic ash, rhyolite, rhyolitic ash, and diabase. These give...become much smaller. The diabase-porphyrite occurs in four masses, extending in a north-and-south direction...which is more irregular in form, occurs to the north-east of Carneddau Farm, and is intruded into the |  | | Book (edition) | | of the gabbro consists of a rock very rich in ilmenite, and also richer in pyroxene than that of the...a percentage of only 32*5, and the iron ores, ilmenite and magnetite constitute 21 per cent, of the total...had a The different genesis. in rocks of e.g., ilmenite, magnetite, etc. occur generally as narrow ultrabasic...where the rocks vary from an olivine-gabbro- diabase, with a silica percentage of 46*5, to a potash...be mentioned Gold. is granites, pegmatites, diabase, diorite, more basic character. From a choice |  | Hazen, Robert M., Hystad, Grethe, Golden, Joshua J., Hummer, Daniel R., Liu, Chao, Downs, Robert T., Morrison, Shaunna M., Ralph, Jolyon, Grew, Edward S. (2017) Cobalt mineral ecology. American Mineralogist, 102 (1) 108-116 doi:10.2138/am-2017-5798 | Journal (article/letter/editorial) | | 64) 2. Schneeberg District, Erzgebirge, Saxony, Germany 21 (4,6,20,22; 28,29,33,35,36,37,40, 44,45,53...Smelter, Hesse, Germany 10 (4,5,6,20,22; 35,44,45,60,61) 9. Wittichen, Baden-Württemberg, Germany 10 (1,20,22;...35,44,45,52,53,60) 10. Siegerland, North Rhine-Westphalia,Germany 11 (1,3,6,11,15,20,21,22; 28,29,44)...Prefecture, Greece 9 (20; 27,28,29,33,44,50,53,64) 12. North Bohemia Uranium District, 8 (3,4,6,14,20,21,22;...Baden-Wurttemberg, Germany 7 (1,4,6,20,22; 35,44) 21. Annaberg District, Erzgebirge, Saxony, Germany 7 (6,20,22; |  | | Report (issue) | | crystals), Felton's farm (Chester), and Ward's quarry; Montgomery County: Sumneytown, and Perkiomenville...Philadelphia: Fairmount Park, Frankford, and Rit- enhouse quarry. SCOLECITE CaAl 2 Si3 Oi .3H 2 O MONOCLINIC ...white radiating tufts; Delaware County: Ward's quarry, mealy white radiations. DESCRIPTIVE MINERALOGY...mines, the corundum mines at Unionville, Brinton's quarry south of West Chester, and the French Creek iron...illustration selected is the symbol of Brinton's quarry, three miles south of West Chester. REFERENCES |  | | Journal (article/letter/editorial) | | wholemagmafrom which the granophyric typeof the diabase hasformedon solidification.The term "basaltic magm..."basalticmagma" would be changedto that of the "diabase magma." Fig. 1. Granophyric aplite penetrating...Drs. E. B. Knopf and A. I. Jonas). The granite-diabase contactis nowhereexposed. It is, however,possibleto...basalticintrusionon the pegmatite, which is exposedin the quarry, althoughmost of the material availablefor study...Fro. 3. Assimilation of granophyric aplite by diabase magma. G. rounded inclusionof granophyricaplite |  | | Report (edition) | | County, the Stillwell quarry in Lancaster County, and the Medusa Cement Company quarry in York County, are...Zircon Crystal 50 Diagramatic Sketch of Brinton Quarry Pegmatite 53 Geologic Cross-Section of West ...84 of Deweylite after Dolomite, Ceclar Hill Quarry 89 _ Limonite Pseudomorphs from Chestnut Hill...permission from the owners of the land, or from the quarry and mine operators, before entering to collect...latitude (east-west lines) and meridians of longitude (north-south lines) The exact de. grees of each are given |  | | Book (edition) | | differ in chemical composition. The margin in ilmenite, of the gabbro consists of a rock very rich and... it has a percentage of only silica ores, ilmenite and magnetite con- stitute 21 per cent, of the...genesis. of the The ores e.g., in rocks of ilmenite, magnetite, etc. narrow ultrabasic streaks this... where the rocks vary from an olivine-gabbro-diabase, with a silica percentage of 46*5, to a potash...amongst which may be mentioned granites, pegmatites, diabase, diorite, and others of still is stituent of igneous |  | | Journal (article/letter/editorial) | | divergent magmatic liquids, now represented by the diabase of the Palisades sill and a pyroxene trondhjemite...surrounding diabase, the mafic (67) and felsic (25) indices, and the position of the diabase on the AFM...section of Walker (1969). The mafic index of the diabase indicates a magma temperature of 1160°C which is...xenolith, the trondhjemite, the contiguous diabase, and a diabase sample 13 m from the xenolith indicate...trondjhemitic magma into the surrounding diabase magma. The diabase and the trondhjemite do not appear to |  | | Journal (article/letter/editorial) | | determined. III.—WoODWARDIAN LABORATORY NOTES.—NORTH WALES EOCKS. Contributed by E. B. TAWNEY, M.A.,...II. [Continued from the May Number, p. 215.) Diabase-porphyrite—from hill designated as a Trigonometrical...Ramsay's Memoir on N. Wales, p. 174, we read: " North and north-east of Pwllheli as far as Plas Du, there is...the felsite. The following one I collected in a quarry midway between farms of Ffrith and Henllys on the...N. of Pwllheli; close by is seen the felsite. Diabase, N. W. of Ffrith, Deneio, in the mass shows an |  | | Journal (article/letter/editorial) | | = Fern). Horizon.—"Wealden [Seward], Locality.—North-west of Um Garaiart, Wadi Alagi, Northern Nubia...Veins. A thin section of an inch vein from Colzium Quarry, Kilsyth, shows under the microscope an apparently...deep-green chlorite, and small skeleton-crystals of ilmenite. Between crossed nicols the rock is seen to consist...and more like the intersertal material in the diabase. The Contact Rocks. Towards the margin the structure...numerous small grating-like skeletal crystals of ilmenite. There are interspersed numerous small microporphyritic |  | | Journal (article/letter/editorial) | | PLATE XII. FIG. 1. Granophyric Diabase, normal variety, Golzium Quarry. Ord. light; x 20. The upper half...want in the slide. The black areas are skeletal ilmenite. This slide represents the type that makes up...Granophyric Diabase, coarse var., Croy. Ord. light; x 7. Mostly plagioclase, micropegmatite, and ilmenite. Augite...regular arrangement of the plates of ilmenite. FIG. 3. Granophyric Diabase, coarse var., Dullatur. Ord. light;...also shows idiomorphic plagioclase and skeletal ilmenite embedded in a turbid micropegmatite ground-mass |  | | Journal (article/letter/editorial) | | paper is about 5 miles east of Rhayader and 4 miles north of Llandrindod Wells. The igneous rocks come to...Caerfagu Mill. The former is approximately half a mile north of the main road from Rhayader to Pen-y-Bont, whilst...has a peculiar form, and trends as a whole in a north-northeasterly direction for a distance of about...the igneous rocks are well exposed in Pen-y-bank Quarry. From this locality the outcrop extends as a narrow...another by well-cleaved, black shales. Immediately north-east of the summit above Baxter, there is a well-marked |  | | Journal (article/letter/editorial) | | Carboniferous lavas, which bound the Midland Valley on the north, west, and south-west. These intrusions are intimately...Clyde Canal. This trough, however, cuts through the north-eastern prolongation of the Croy mass. The third...abutting against the main boundary fault to the north of Kilsyth. A short general account of the nature...Calciferous Sandstone and its intercalated lavas to the north. The boundary here is the main E.-W. fault. The...as " The Riggin", which runs in a south-west to north-east direction, from Twechar to Banton. The general |  | | Journal (article/letter/editorial) | | iron-bearingdeutericfluids existed in the Triassic diabase. It is proposedthat the deuteric fluids transferred...veinsare consistently borderedby hydrothermally ilmenite, biotite,chlorite,hornblende,quartz,apatite, bleached...are during the end stagesof crystallizationof diabase deeply corrodedand commonlytake the shapeof magma...Geology of Laurel Hill grains composedlargely of ilmenite lamellae. DeDarton et al. (1908) were the first...basefrom Pennsylvania. Traprock Corporationgravel quarry where the diaEach of six samplesof freshunalteredLaurel |  | | Journal (article/letter/editorial) | | GEOLOGICAL SOCIETY. X X X I I I . An Analcite Diabase and other Bocks from GullaneHill. B y B . BOBERT...in a somewhat crescentic r i d g e running in a north-westerly direction, mounts up to a l i t t l e over...section of the 50-feet beach is exposed in Gullane Quarry, where 5 feet of well-stratified sandy gravel and...along the ridge till it terminates in Gala L a w Quarry. At C o r b y Craigs it forms a precipitous cliff...present. Fairbanks in his paper o n the analcite diabase of the Cuyamas V a l l e y of Cali fornia finds |  | | Report (issue) | | .............................. __ . Hock :from quarry near Moiliili Chmch .............................radiate deep canyons, the principal ones being on the north, west, and south sides. In the walls of these canyons... 7. 21 Magnetite........................ 2:32 Ilmenite.................... . . . . . . 3. 19 Pyrite....plates rather than in grains and is -probably ilmenite. Residual areas of gray globulitic glass with...discovery of a coarsely granular rock, called "olivine diabase," in the west fork of Wailau Canyon, on the island |  | | Journal (article/letter/editorial) | | Diorite, and GneissicDiorite. The Diabase. V. T h e Hornblende-Diabase. VI. The Hornblende-Pierite. VII...irregular shape, which extends about 5~ miles from north to south, and has a greatest breadth of about 2~...Sir A. Ramsay in his memoir on the "Geology of North Wales " t , and from Dr. Hicks +% who claims a portion...Diorite, and Gneissic Diorite; ])iabase; Hornblende-Diabase; Hornblende-Picri~e; and Dolerite. Some of these...divided into two groups--an acidic, developed in the north and west, and a basic and intermedia~ in the east |  | | Report (issue) | | .................................... Millbrook Quarry Member ..........................................the depositional model ........................ Diabase..................................................the Newark Supergroup strata exposed in Eastern North America...................................--.--...on a quarried slab at the Culpeper Crushed Stone quarry, Stevensburg, Culpeper County, Va. ..............Bluff Siltstone exposed in north quarry face at the Culpeper Crushed Stone quarry near Stevensburg, Culpeper |  | | Journal (article/letter/editorial) | | Orthoclase Quartz Rutile Same as above and Chlorite Ilmenite Magnetite sand Phlogopite Mt. Hooe Bav area ...Clayville N. of W. Greenwich Chlorite Cyanites Ilmenite Labradorite Microclines Olivine Serpentine Chlorite...HilI W. of Apponaug Epidote Garnet Magnetite Ilmenite Orthoclase Masonitee PawtuxetT Quartz Graphite...Secondary after pyrite. 7 These towns are just north of the Pawtuxet River qhich divides Kent and Providence...X{rxnr-qr-s FouNo Epidote West shore midway between north and south Garnet Ottrelite ends of the island. Staurolite |  | | Report (issue) | | Loudoun County 143 Prince William County 149 Diabase quarries of northern Virginia 155 CAPTIONS Illustrations...Ilchester, Maryland. Figure 6. Triassic diabase dike forming a ridge north of Route 7 near Dranesville, Virginia...« Serpentine variety picrolite from the Delight quarry, Delight, Maryland. Specimen is about 12 cm by...Maryland. Figure 17. Location of the Marriottsville quarry, Hernwood, Maryland. Figure 18. Marble (white)...Marriottsville quarry, Hernwood, Maryland. lii Figure 19. Location of the Greenspring quarry, Towson, Maryland |
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