 | | Book (edition) | | petrographic description of each important rock-group includes, or is followed by, an account of the distribution...of things we can do little about it; but for one group of rocks that are much to the fore at the present...FELSIC MINERALS Feldspars; Feldspathoids; Silica Group Ill ACCESSORY AND SECONDARY MINERALS 97 The Normal...Contamination; Zeolites; Epidote Group; Chlorite, Serpentine Group; the Carbonates; Talc Part II: Modes... ILLUSTRATIONS flG. PAGE 1. Tetrahedron and SiO4-group 2. The atomic structure of olivine 3. The atomic |  | | Book (edition) | | closely packed round a silicon atom, giving an Si04-group. The oxygens lie at the corners of a tetrahedron...fits snugly into fig. 1 Tetrahedron and SiCU-group. The small silicon atom is hidden between the four...surrounded. Thus an Al3+ in the centre of an octahedral group of O’s, has a positive charge of three units to...scientifically, felsic and mafic respectively. The mafic group comprises the ferro-magnesian silicates: the olivines...feldspathoids respectively, and the silica group. OLIVINES This group comprises a number of important rock-forming | | | Book (edition) | | closely packed round a silicon atom, giving an SiO4 -group. The oxygens lie at the corners of a tetrahedron...snugly into M,K.W. FIG. I Tetrahedron and Si04-group. The small silicon ato1n is hidden between the four...surrounded. Thus an AP+ in the centre of an octahedral group of O's, has a positive charge of three umts to share...scientifically, felsic and mafic respectively. The mafic group comprises the ferro-magnesian silicates: the olivines...feldspathoids respectively, and the silica group. OLIYINES This group comprises a number of in1portant rock-forming |  | | Book (volume) | | attempt has been made to collect, summarize and group these contributions under mineral headings, and...exceptions, the treatment of each mineral or mineral group is in five sub-sections. In the Structure section...1961 CONTENTS Vol. 2. Chain Silicates PYROXENE GROUP.1 Orthopyroxenes ........ Diopside-Hedenbergite...RHODONITE.182 BUSTAMITE.191 PYROXMANGITE.196 AMPHIBOLE GROUP.203 Anthophyllite-Gedrite . . . . . . .211...Leidse Geol. Mededelingen. PYROXENE GROUP Pyroxenes are the most important group of rock-forming ferromagnesian |  | | Book | | Nortlrn·est Highlands of Scotland Con Gillen 9. The Inner Hebrides of Scotland Con Gillen 11. The Gulf...sters Da,·id Alexander Geology and landscapes of Scotland Con Gillen La catastrophe: A1ow11Pelee and the.............................. 529 G: gadolinite group to gyrolite ......................... 226 X: xanthiosite...London; National Museums of Scotland (Royal Museum and Museum of Scotland), Edinburgh; Oxford University...t.1useum (NaturalHistory). NMSNati:malMuseumof Scotland(RoyalMuseuma:idt.~JSe:.rm of Scot'a:1d). Edinb |  | | Book (edition) | | FLAGSTONES, RISHTON, LANcs. 20 II. A. WAVE-CUT PLATFORM EAST OF ST. ANDREWS, FIFE • 21 B. COAST PROTECTION: GROYNES...SWITZERLAND 36 IV. A. PARALLEL ROADS OF GLEN ROY IN SCOTLAND 37 B. IRREGULAR SOLUTION-SURFACE OF CHALK, COVERED...clayey deposits containing boulders, as in parts of Scotland, the Tyrol, and elsewhere. All stages in their...south-west wind. Accumulations of blown sand occur on the East Anglian coast and in other parts of Britain. Dunes...a hundred miles or more, as in the region south-east of the Qattara Depression in North Africa. They |  | | Report (issue) | | mistakes, the excellence of his achievement with this group of minerals adds much to the value of this report...eat Othersmineralstitees p Ow O “HOA De Primanva Group Ol ROCKS ssmatackat si 4 2 furae) Sa ertien nya...Topographic map of East Boulder Plateau, Montana 2. Geologic sketch map and cross section, East Boulder Plateau...harzburgite...... 17. Dunite “dike” with central pyroxene vein, and textural relations in typical harzburgite...Anorthosite Zone...............000 cece eevee eeeee Pyroxene: plagioclase ratios in various units of the complex |  | | Book (edition) | | bedding Deltas River discharge problems in the Fens of East Anglia The work of the sea Coastal erosion Littoral...Tidal surges in the North Sea Submergence in south-east England Coast protection works Marine deposits The...around the coastal regions of the Pacific, from the East Indies through the Philippines, Japan, the Aleutian...the eastern Mediterranean to the Himalayas and the East Indies, where it joins the first belt (Fig. 1.4)...of an extensive fracture system that traverses Scotland and continues past Caithness and Orkney. Another |  | | Book (volume) | | Society, Burlington House, Piccadilly, London W1V OJU, UK. The Society is a Registered Charity, No. 210161...Brassmill Enterprise Centre Brassmill Lane Bath BA1 3JN UK (Orders: Tel. 01225 445046 Fax 01225 442836) Distributors...Typeset by Type Study, Scarborough, UK. Printed by The Alden Press, Oxford, UK. Australia (Orders: Tel. (08)...(08) 379-0444 Fax (08) 379-4634) India Affiliated East-West Press PVT Ltd G-1/16 Ansari Road New Delhi...Preface to Second Edition Acknowledgements Amphibole Group: Introduction Mg-Fe—Mn-Li Amphiboles Anthophyllite—Gedrite |  | | Book (edition) | | Kirby, Wirral, UK Printed by Berforts Information Press, Stevenage, Hertfordshire, UK Downloaded from...Serpentine Clay Minerals Kaolinite group, Illite group, Smectite group, Vermiculite Prehnite v vii viii...216 224 227 226 244 Framework Silicates Feldspar group Alkali feldspars, Barium feldspars Plagioclase feldspars...Kalsilite, Leucite, Sodalite Group, Cancrinite–Vishnevite, Scapolite Zeolite group Analcime, Natrolite, Phillipsite–...Olivine 4 Zircon 12 Titanite (sphene) 15 Garnet group 18 Vesuvianite (idocrase) 28 Sillimanite 30 Andalusite |  | | Book | | College of Science and Technol1 " London NORTH EAST WALES INSTITUT Edward Arnold 1 111! ll!!fii,~i...(Australia) Pty Ltd, 80 Waverley Road, Caulfield East, Victoria 3145, Australia Second edition 1945 Reprinted...minerals Olivine group Pyroxene group Amphibole group Mica group Feldspar group Feldspathoid group Forms of silica...sediment (e.g. sandstone, shale); some rocks in this group have been formed by chemical deposition (e.g. some...around the coastal regions of the Pacific, from the East Indies through the Philippines, Japan, the Aleutian |  | | Book (edition) | | Feldspar Group Less-common Silicate Minerals with Framework Structures The Feldspathoid Group The Scapolite...Scapolite Group The Zeolite Group Common Silicate Minerals with Sheet Structures The Mica Group The Chlorite...Chlorite Group The Clay Group The Serpentine Group Less-common Silicate Minerals with Sheet Structures...Minerals with Chain Structures The Pyroxene Group The Amphibole Group Less-common Silicate Minerals with...Tetrahedral Groups The Epidote Group The Garnet Group The Olivine Group Less-common Silicate Minerals |  | | Audio (Series) | | Ocoumence a Rode igpes! Mes eo eete re as a 0) IDWS Roel east, (Clea) G 6 4 6-6 5 6 8 BS 6 6 6 6 6 bo oe so A...stick. Salt is damp; tobacco is wet. Red sky in the east in the morning. Stars “huddle,” twinkle, hide, or...on the approach of a ‘‘low.” E. Miscellaneous: East wind, especially if long continued. Clear morning...whole crust, and so the dominance of the first group justifies the emphasis usually placed upon it. The...the three main classes of rocks later, as each group is described. Mineralogic methods include chemical |
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