 | | 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 |  | | Journal (article/letter/editorial) | | alpine fissure veins. Associated minerals include calcite, quartz, prehnite, danburite, axinite, garnet,...stilbite, heulandite, pectolite, apophyllite, calcite,, and quartz, and its crystal aggregates often...rock at notable localities such as the Cheapside quarry at Deerfield, Franklin County, where it occurred...Massachusetts; fine specimens were also found at the Notch quarry at nearby Amherst. Similarly, datolite occurred...in the Braen quarry, Haledon; the Francisco quarry at Great Notch; and the Riverside quarry, Totowa, also |  | | Journal (article/letter/editorial) | | chalcocite, bornite, pyrite, tetrahedrite, and even calcite pseudomorphs after chalcopyrite. Chalcopyrite is...from the Old Lurzenbach mine, Gosenbach, Siegen, Germany. Jack Halpern specimen, Jeff Scovil photo. distribution...encountered in the diabase quarries of Fairfax County and the Goose Creek quarry near Leesburg, Loudoun...found in the Gardner Hill mine, Guilford County, North Carolina. Some of the finest chalcopyrite specimens...reaching 4 cm across were often associated with calcite, magnetite, and actinolite. Disphenoids modified |  | | Report (chapter) | | Siliceous rocks of the Culm Basin, Germany HANS-JI~IRGEN GURSKY Geologisch-Pal~iontologisches Institut...Darmstadt, Schnittspahnstrasse 9, D-64287 Darmstadt, Germany Abstract: The classic Dinantian cherts of the...the Rhenish Massif and Harz Mountains, Germany, were analysed for their petrography and sedimentology. They...and petrological aspects of Dinantian cherts in Germany have been studied by several modern authors (e...and chemistry of Dinantian siliceous rocks in Germany (Gursky 1992). Occurrence and geological setting |  | | Book | | Martin Meschede Laurence N. Warr The Geology of Germany A Process-Oriented Approach Regional Geology...Reviews Series editors Roland Oberhänsli, Potsdam, Germany Maarten J. de Wit, Nelson Mandela University, Port... Martin Meschede • Laurence N. Warr The Geology of Germany A Process-Oriented Approach 123 Martin Meschede...and Geology University of Greifswald Greifswald, Germany Laurence N. Warr Institute of Geography and Geology...Geology University of Greifswald Greifswald, Germany ISSN 2364-6438 ISSN 2364-6446 (electronic) Regional |  | | Journal (article/letter/editorial) | | Lithosphare, Goldschmidstr. 3, D-37077 Gtittingen, Germany Abstract The Rhenohercynian thrust- and fold-belt...mineralisation, which is restricted to the Rhenish Massif, Germany. It is formed during four major stages and siderite...inclusions, R E E fractionation, Rhemish Massif, Germany. Introduction T i n s paper presents new data...Variscan siderite lodes of the Siegerland district, Germany, which have been among the world's largest occurrences...of the Variscan orogeny. It is bordered to the north against the autochthonous foreland along the Variscan |  | | Journal (issue) | | VII, pp. 334-338 (quartz after interstices from North 1926, Proc. Acad. Nat. Sci. Phil., LXXVIII,'pp....203-207. Discussion of the quartz pseudomorphs after calcite and barite common in the epithermal veins of the...(molds) after glauberite and anhydrite common in the diabase of this region. SCHEERER, TH., 'Ueber Pseudomorphosen...products of parisite and synchisite,3 CaO after calcite,4 for natural occurrences of brucite after chrysotile5...after calcite type, also tetrahedrite after chalcopyrite, siderite and rhodochrosite after calcite, albite |  | | Journal (article/letter/editorial) | | include azurite, pyromorphite, fluorite, quartz, and calcite. Then there are the minerals that collectors have...carbonate, or Fe2+CO3, and is a member of the calcite _ group, crystallizing within the trigonal system...include hematite, magnetite, quartz, cacoxenite, calcite, barite, and various chlorite minerals, but these...encrustation type. Siderite has been known to pseudomorph calcite, dolomite, fluorite, barite, gypsum, galena, and... a rare igneous rock type composed chiefly of calcite but other carbonate minerals as well. Fibrous or |  | | 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... You will be told that these are fragments of calcite crystals. Three minerals will be mentioned to you...consisting (apart from impurities) only of the mineral calcite. Granite is the bestknown example of a rock consisting...Pr..1iTE 2 Sulphur Abo/le Sulphur crystals on calcite. Below A specimen of massive sulphur. Both from |  | | Book | | zeolite mineralogy was done, at that time, in Germany, Italy, France, and Great Britain. Because of differences...connected by minute veinlets containing phillipsite, calcite, and smectite. Jointing of the columns across zeolite-filled...Lower Miocene columnar basalt in the Narre Warren Quarry, near Melbourne, Australia. The minerals are believed...fault surfaces to produce zeolite-lined veins. Calcite commonly is a late forming mineral and fills many...Mehegan et- al~, 1982; Kristmannsd6ttir, 1982). Calcite and m,ontm,orilonite clay were fo,u'nd throughout | | | Book | | zeolite mineralogy was done, at that time, in Germany, Italy, France, and Great Britain. Because of differences...connected by minute veinlets containing phillipsite, calcite, and smectite. Jointing of the columns across zeolite-filled...Lower Miocene columnar basalt in the Narre Warren Quarry, near Melbourne, Australia. The minerals are believed...fault surfaces to produce zeolite-lined veins. Calcite commonly is a late forming mineral and fills many...Mehegan et- al~, 1982; Kristmannsd6ttir, 1982). Calcite and m,ontm,orilonite clay were fo,u'nd throughout |  | | 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...pyramids rhombohedron apatite beryl, corundum calcite quartz tourmaline orthorhombic rhombic prisms... calcium carbonate (CaC03) may crystallize as calcite (calc spar) which is trigonal, or, under different...spherical cavities which are called geodes. Quartz, calcite and fluorite are typical of such crystals. Mostly |  | | Journal (article/letter/editorial) | | adjacent land at lower levels. The one I know best is north of Easington on the Durham coast; a patch of shelly...Hartlepool and Roker, which continue under the North Sea. The Permian of East Durham has in the Tertiary...000 feet thick. As this was denuded away most of North and Central England remained a land surface, the...are a range that has a metamorphic core. On the north side the Jurassic and Cretaceous rocks are not schistose...they are torn apart and the spaces filled with calcite. The Furka Pass involvement is one I have seen |  | | Book (edition) | | 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...like British is dependent on the distribution of diabase and Guiana diorite. In other cases of more rare...and particularly the basalts Spain, America, Germany), contain minute grains of native iron, in some...province of Norbotten, which lies about 67 50' north latitude, the chief ore deposits occur at Kirunavaara |  | | Book | | Carolina Biological Supply Company of Burlington, North Carolina. To those whose efforts made the use of...must have potassic feldspar, limestone must have calcite, sandstone must have quartz, and so on. Characterizing...with ordinary sediments such as detrital quartz, calcite, and clay minerals. Rocks as well as minerals and...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 |  | | Journal (issue) | | THL Y Contents for April, 1941 CHIPS FROM THE QUARRY .................................................OPAL MINE ........................ KIBBLEHOUSE QUARRY, PERKIOMENVILLE, PA. By William F. Haeberle .....T etrahedrite, Gottesg~be Mine, Roth, Nassau, Germany ; Celesttte, Giona Mine, Girgenti, Sicily, Italy...regarding the source of the specimens-name of mine or quarry if possible but at least the town, village, settlement...compressed air, pass under the river. vated in the diabase of the Palisades. When this tunne:l is mentioned |  | | Book (edition) | | 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...British Guiana is dependent on the distribution of diabase and In other cases of more rare occurrence, alluvial...and particularly the basalts Spain, America, Germany), contain minute grains of native iron, in some...province of Norbotten, which lies about 67 50' north latitude, the chief ore deposits occur at Kirunavaara |  | | Report (Issue volume) | | igneous rocks, or clearly associated with Triassic diabase. As with the Paleozoic group, a younger age limit...Cornwall-type magnetite I ,000,000,000 Copper adjacent to diabase 1,000 Copper in Triassic redbeds 1,000 Phoenixville...Triassic diabase. Cornwall-type magnetite-copper deposits. Cu in Triassic sediments adjacent to diabase, and...deposits. Cu in Triassic sediments distant from diabase. Zn-Pb-Cu in quartz veins cutting Triassic and...23 24 25 26 27 28 29 30 Bonneaughtown Teeter's quarry Gettysburg Hunterstown Near Heidlcrsburg Center |  | | Journal (article/letter/editorial) | | 1860 CONTACT-METAMORPHIC EFFECTS OF TRIASSIC DIABASE AT SAFE HARBOR, PENNSYLVANIA BY RANDOLPH W. CHAPMAN...and apophyses 194 ic t aureole 196 -pay of the diabase dike and apophyses. 197 uiphy and contact metamorphism...Safe Harbor y. Pennsylvania 192 'P^yseal dike of diabase intruding •Rs;ft dolomite 196 . vein in altered...vertical, north- zoisite. Heat was the paramount factor in the meta, trending dike of Triassic diabase transects...played a role. In the outer zone, • 'icep quarry in the diabase affords a splendid hydrothermal solutions |  | | 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...Pyrite Limonite Pseudomorph after Pyritohedron Calcite Crystal Forms . . 91 92 94 99 101 “Picrolite”...Mineral Formation Map Muncy Rhombohedron Geologic Calcite 80 of the Cornwall Pit at . at Easton Valley |  | | Journal (article/letter/editorial) | | REPORT OF AN EXCURSION TO CORNWALL. NORTH APRIL 9TH TO 18TH (EASTER), 1914. PART By 1. HENRY DEWEY...splitting and trimming the slate for the market. The quarry itself was then entered, the conspicuous dip of...bands of vesicles infilled with pink or creamy calcite lying EXCURS IO N TO N ORTH COR N WAL L. in...Tredorn Beds, by 6. The beds seen at Tintagel incline north -westwards in the following order: I, Z, 3, 4, 5...quarried in several huge excavations. At Lanterdan Quarry the chlori toid-spo tted Woolgarden phyllites are |  | | Report (edition) | | Crystal . . . . . . .. Diagra1natic Sketch of Brinton Quarry Pegmatite Graphic Granite Geologic Cross-Section...Deweylite after Aragonite. Cedar Hill Quarry . . . . . . . Calcite Crystal Forms "Picrolite" . . . . ....at Easton Geologic Map of the Muncy Valley area Calcite Rhombohedron . . ... • IV . Vl 6 9 10 12 17... Q t9 Diabase intrusions 225 er ...permission from the owners of the land, or from the quarry and mine operators, before entering to collect |  | | Journal (article/letter/editorial) | | lies a few miles north of Cambridge on the border of the Boston Basin. A large quarry for road metal has...filled with calcite but some of them show a variety of earlier minerals when the calcite has been removed...zeolites heulandite and chabazite and always by calcite. The crystals are rarely more than a few millimeters...MINERALOGICALSOCIETY OF AMERICA 297 in a quarry opened recently in the diabase at the foot of Mt. Tom, a few hundred...It occurs with prehnite and calcite in gash veins traversing the diabase. Openings in the vein are coated |  | | 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 |  | | Journal (article/letter/editorial) | | microscopical study of the interstitial chlorite in the diabase-minverite series of south-west England. These disprove...comparatively low degree of alteration, the diabase-minverite series of North Cornwall and South Devonshire turned...comparatively high temperature, minerals such as zeolites, calcite, analcite, and albite associated with it cannot...of chlorite from the chemical analyses of the diabase and minverite respectively. The results quoted...for chlorite, and on the averaged analyses of diabase and minverite from south-west England (Lehmann |
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