 | | 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... -25- Many oxides are hard and compact, as corundum; this is the case when the cations are much smaller...Two examples of rhombohedra Tabular crystal of corundum though often loosely used for ‘general shape’ |  | | Book (edition) | | expressed in clase. 7 - quartz. 8 - topaz, 9 - corundum, 10 - dia- percentage. The collected data on optics...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 |  | | Book | | scalenohedron The HexagonalHI ery] pyrrhotite i corundum System octahedron > & zincite apatite trisoctahedron...results in a pseudo-symmetry, i.e. crystals of lower symmetry are twinned in such a way that they form...gypsum 7. quartz 3. calcite 8. topaz 4. fluorite 9. corundum 5. apatite 10. diamond These hardness tests can...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 |  | | Book | | A CHANGING PLANET 11 Vanadinite, San Carlos district, Chihuahua, Mexico * 8 x 4 x 2 cm Mineral Species...sapphires and rubies are actually the same mineral, corundum. The difference between the two is at the atomic...Fluorapatite Topaz Hardness 6 Hardness 9 Microcline Corundum encke Madagascar e(2x23x3em Quartz, Mount Ida...Ida, Arkansas, USA ° 14x 15 x 10 cm Corundum, Mozambique * 17 x 11 x 10 cm Hardness 7 Hardness 10 ...manganese oxide on limestone, Solnhofen, Bavaria, Germany * 11.5 x 24 x 0.5 om MINERALS: PRODUCTS OF A | | | Book | | rhombohedron scalenohedron calcite wulfenite corundum 1 m a es X — O U> = j? -a nepheline beryl...results in a pseudo-symmetry, i.e. crystals of lower symmetry are twinned jn such a way that they form...gypsum 7. quartz 8. topaz 3. calcite 4. fluorite 9. corundum 10. diamond 5. apatite These hardness tests can...that of the next lower grade. In this case we consider the hardness to be of the lower grade adding a half-grade...fibrous and porous aggregates often seem to have a lower hardness because of the blank spaces between individual |  | | Book | | schist can be modified to describe rocks like corundum syenite, phosphatic shale, feldspathic sandstone...names like granogabbro (granite-gabbro), monzogabbro (monzonite-gabbro), rhyodacite (rhyolite-dacite)...+ mafurite + ugandite],marundite [margarite + corundum], rhyoandesite [rhyolite + andesite], sporbo [smooth...[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 |  | | 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 | | 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 |  | | Journal (article/letter/editorial) | | Authors are printed in SMALLCAPITALS,Subjects in lower-case roman, and Localities in italics. T h e m i...Aerugite, synthesis, 72; Cornwall, anal., X-ray, 72; Saxony, anal., X-ray, 72. Aeschynite-priorite series,...topotactic formation from y-CaSiOa, 347. Ankerite, Germany, topotactic decomposition of, 634. Anthoinite,...Arsenobismite, Brazil, 785. Artern, Sachseu-Anhalt, Germany, mellite, 542. ASWATHA~ARAYA~A(U.), Isotopic ages...(S.), see SARBADHIKARI (T. n.), 770. Bhilwara district, ]~ajasthan, India, scorodite, 776. BmaAR (G. |  | | Book (volume) | | reserved. H., Hofbuchdruckerei, Cothen-Anhalt (Germany). PRECIOUS The Precious Stones. Precious others...mineralogical as of of varieties, or is value corundum name, the very in prevailing of different...when when of consideration, mineral same corundum while the chemical as define of To secondary...words, cut of the strike to the the amount corundum 1.62, able are shows in and on silver....like will the is light quartz from the lower jour setting, a are at on quartz all much |  | | | | carbonate, borate, and phosphate groups are included. Corundum, spinel, cuprite, rutile, cassiterite, calcite...fluorite, 5 apatite, 6 feldspar, 7 quartz, 8 topaz, 9 corundum, 10 diamond. For field identification it is sufficient...interest that on an absolute scale of hardness corundum is actually two thousand times harder to scratch...cassiterite (dark reddish brown, black), p. 120 corundum (grey, blue), p. 112 gypsum (white), p. 124 ...rhyolite (p. 256) Medium diorite (p. 250) Dark gabbro (p. 252) andesite (p. 260) basalt (p. 262) obsidian |  | | Book | | minerals are the raw materials of the landscape. Every valley, hill and mountain peak is made entirely of rocks...just 20km/12 miles beneath California’s Central Valley, it is substances like zinc and lead that join...so great that the iron simply cannot melt. The lower mantle is 6702,900km/420-1,800 miles down. Here...the underside of the crust, creating rocks like gabbro. Some oozes up into vertical cracks created by...drop away down these 'faults' to open up a rift valley, flanked by mountains formed from blocks that didn't |  | | Journal (article/letter/editorial) | | mineral, occurring with calcite as R vein in gabbro a t Radau-thal, is proved to be cobaltiferous lollingite...cent. of nitrogen. L. J. S. Analyses of Corundum and Corundum-bearing Rock. By WILLIAM L. GOODWIN (Rept...238-239. Compare this vol., ii, 552).-Crystals of corundum from Eastern Ontario gave the following results...36 0.32 -- - Analyses are also given of the corundum-bearing rock. L. J. 8. Phosphorescent Dolomite...1241. 11. Rose-red tourmaline from Wolkenburg, Saxony ; sp. gr. 3.106. 111. Black tourmaline from Vitosa |  | | Book (edition) | | scale to soapstone at the other. There is a still lower limit in liquids and gases; but of the hardness...the planes of the trisoctahedron in Fig. 21. The lower one of the three on the upper front solid angle...by a constant ratio, and the expression for the lower right one of the six planes will be 3c f & la. By...planes will remain essentially the same. In Fig. 10, bad the plane lettered | been made the plane 1, then...being here directly over those suppressed in the lower pyramid. APATITE. If the student will shade over |  | | Journal (article/letter/editorial) | | INDEX Names of authors are in capitals, subjects in lower case roman, and localities in italics; book reviews...ACKLAND,G.J., 585 Advanced argillic alteration of a corundum-quartz assemblage from the Bond range, Tasmania...group minerals, 93 Andalusite, associated with a corundum-quartz assemblage in volcanic rocks from the Bond...geochronology and mineralogy of orangeites from the Damodar Valley, eastern India, 313 ARLT, T., 801 AsHwoarn, J.R...iodargyrite from, 471; Tasmania, Bond Range, a corundum-quartz assemblage in altered volcanic rocks from |  | | Report (volume) | | GEOLOGICAL SURVEY - CHARLES D. WALCOTT, DIRECTOR CORUNDUM ITS OCCURRENCE AND DISTRIBUTION IN THE UNITED...__..-.._.__.--...- -18 Physical properties of corundum ......................................... 1.5...composition of corundum ........................................ Determination of percentage of corundum in an...---..-.-..-..-...-,.-..--..-.....Sapphire or gem corundum ........_...'.................--..-.-. .........--.-.... Corundum......-....-.-.......--.......-......--......--........_... Block corundum......... |  | | 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...Fuchsite: green; contains a mixture of damourite and corundum from Unionville. is Orthorhombic according to... the Gap nickel mines, the corundum mines at Unionville, Brinton's quarry south of West Chester, and |  | | Catalog/List | | mass of black crystals, some Mount Malosa, Zomba District, free standing. ______ ______ Malawi Black crystal...Arizona Pure green cleavage AMAZONITE Landsverk quarry, Evje, Norway Ixl 50p lx2£l 11 felspar group____________...£3 7 Pure black mica plate new Analysis , Saga Quarry, Tvedalen near ANNITE Mica__________ paper available...Chrysotile, pale grey-green Ixl £1 County Bridge Quarry,Lizard Mg Fe SiO_______ massive. _________ .Cornwall...S.A. Rotlaufchcn Mine Waldgirmes, 1 x 'A £2.50 Germany Ixl £2 Carnelian Bay.Scarborough Yorkshire 1x2 |  | | Report (volume) | | ARSENIDES. BISMUTHINITB. From the Rosario Mining District, Sinaloa, Mexico. W. I-I. Melville. Described...mine of the Canadian Copper Company, Sudbury, district of Algoma, Ontario. Specific gravity, 4.541 ~...corrected for impurities. From the Missouri mine, Halls Valley, Park County, Colo. Analyses, by Hillebrand, of...82 CRYOLITE. From St. Peters Dome, Pikes Peak district, Colorado. Described by Cross and Hillebrand in...PACHNOLITE. From St. Peters Dome, Pikes Peak district, Colorado. Described by Cross and Hillebrand in |  | | 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...(3 faces) pyramids rhombohedron apatite beryl, corundum calcite quartz tourmaline orthorhombic rhombic...hardness. Each mineral will scratch those in a lower division on the scale and can be scratched by those...calcite fluorspar apatite feldspar quartz topaz corundum diamond Resistance to Grinding 003 1-25 4.5 |  | | Book (edition) | | 134 143 THE TRACHYTE AND ANDESITE FAMILY THE GABBRO FAMILY . 152 156 170 . THE GREENSTONE FAMILY...The plutonic rocks-granite, syenite, diorite and gabbro - occur frequently in bosses . Laccolite.- A dome-shaped...many igneous areas (e.g. , in the English Lake District and in North Wales) . Dykes and Veins. - A dyke...sometimes form marked features in the scenery of a district ; for, being more capable of resisting the disintegrating...beautiful scenery of North Wales and of the Lake District owes its origin to the great development of volcanic |  | | Book | | apatite; 6, feldspar; 7, quartz; 8, topaz; 9, corundum; 10, diamond. The use of the scale is simple...vaspian Sea, hina, ndia, etc. ‘ornwall, farz Mts. Germany), ‘io Tinto Spain), Chile chalcopyrite (copper...fibrous, encrusting aggregates, radiating Javaria Germany), -rimea, 3olivia prismatic crystals (monoclinic)...staurolite, nglesey, ermatt switzerland), osta Valley taly), ‘alifornia, soda-rich hornblende Turquoise...Crystal Form gemstone columnar, pyramidal, (Blue Corundum) =———_____— Al.03 Plate XI.14 Blowpipe: Not fusible |  | | Report (volume) | | https://archive.org/details/corundumperidoti01prat CORUNDUM AND THE PERIDOTITES OF WESTERN NORTH CAROLINA...SURVEY J. A. HOLMES, STATE GEOLOGIST VOLUME I CORUNDUM AND THE PERIDOTITES OF WESTERN NORTH CAROLINA...Carolina Geological Survey, a description of the Corundum and the Peridotite Deposits of Western North Carolina...I.—The corundum belt of North Carolina. General geology of the State. Geology of the corundum belt. Rocks...Rocks of the corundum belt. 21 21 23 26 Chapter II.—The peridotites and associated basic magnesian |  | | Book (edition) | | Segregation of Cassiterite Segregation of Alumina as Corundum Segregation of Metallic Sulphides and Cobalt of...Ores (Magnetite and Haematite) of - Manganese Corundum - Deposits of Sulphides Contact Metamorphic...Australia and Tasmania The Stanniferous Alluvia of Saxony and Bohemia ; Miscellaneous Alluvial Tin Ores...part in all the folding and faulting that the district may undergo ; and if in the mass form of a bed...reference to the original structure of of the district, the area. mining districts occupy disturbed |  | | Journal (article/letter/editorial) | | intrusion and rapid cooling of the Frankenstein gabbro (Odenwald, SWGermany) evidenced by4~ and single-zircon...saxothuringischen Zone der Varisciden. An Mineralien aus Gabbro-Gesteinen dieses Komplexes wurden 87Sr/86Sr-Anfangswerte(Pyroxen)...(Zirkon) bestimmt. Das 87Sr/86Sr-Anfangsverh:,iimisdes Gabbro weist Nit 0.70380 auf Mantelherkunft hin. Die K-At-Alter...and cooling of mafic plutonic rocks. R~sum~ Le gabbro de Frankenstein, situ~ dans la pattie nord de l'Odenwald...saxothuringienue de la cha~ne hercynienne. Les min&aux de ce gabbro ont fait l'objet des mesures suivantes: rapport |
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Gabbro Quarry, Radau valley, Bad Harzburg, Goslar District, Lower Saxony, Germany