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| 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...olivinefels with nematoblastic (velonblastic) tremolite. (Olivine megablasts along shearing planes of...olivinefels with nematoblastic (velonblastic) tremolite. (Olivine megablasts along shearing planes of |
 | | Journal (article/letter/editorial) |
| wollastonite, 649; lithian tourmaline, 747 Newhurst quarry, Shepshed, Leicestershire, vesigni6ite, 533 Cornwall...dunite, 493 Scara Ruadh, serpentinite, chlorite-tremolite schist, anthophyllitite, 493 IRELAND Carneal*...* Confluence of Carneal Water and Clenoe Water Germany (Deutschland) Bramburg, G6ttingen, tacharanite...Breitenbrunn ( ~ Breitenhof), Saxony, helvine, 627 Schwarzenberg, Saxony, belvine, 627 ~gi~ (~l~jquO...glauconite, 753 SCOTLAND France Auchinstarry quarry, Kil~yth, Stirlingshire, julgoldite, 761 Blackcraig |
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| 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 |
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| 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 |
 | | Journal (article/letter/editorial) |
| nephrites. Europe Swiss Alps French Alps East Germany West Germany Poland Finland Asia America California Wyoming...66 CHAPTER V — Crystallochemical features of tremolite in nephrite 74 General crystallochemical features...similarity and differences I. Broad-prismatic tremolite-actinolite amphibole II. Nephrite Mineralogy of...true for the fine fibrous habit of its component tremolite. The majority of the authors associate it with...nephrite and compared with common broad-prismatic tremolite. The crystallochemical features of nephrite were |
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| 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 |
 | | 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...Actinolite ♦ CaiMg,Fe 2+)5 f(OH)ISi4O 11h (9.D, tremolite group). Varieties: manganoan actinolite, chromean |
 | | 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) |
| I N distinct from that of the rest of Lizard district is very Cornwall. The great plutonic masses of...the county. In the Mevagissey area serpentine and gabbro occur, not unlike those of the Lizard j at Start...petrographical characters the rocks of the Lizard district might be regarded as presumably of Archsean age...End. The plutonic complex consists of serpentine, gabbro and gneiss, and may be described as forming "bosses"..."stocks." The rocks that surround the serpentine and gabbro are older than the plutonic bosses; they represent |
 | | Report (edition) |
| Geology of Cornwall ., Devon and West Somerset. The district has now been re-surveyed on the six-inch scale...referred to in geological literature as the Lizard District altho11gh it forms a part of Meneage, an old Cornish...the very extensive literature relating' to the district. Dr. W. Polla1..cl ancl Mr. E. G. Raclley }1a...Serpentine or Lherzolite ... ... . .. .... .. . ... Tremolite Serpentine... .... ... .. . .. . Dunite Serpentine...Dow11s Gabbro The Gabbro Dykes... ... ... .... ... Petl'ography of the Troctolite a11d Gabbro ... Troctolite |
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| referred to in geological literature as the Lizard District although it forms a part of Meneage, an old Cornish...the very extensive literature relating to the district. Dr. W. Pollard and Mr. E. G. Radley have n1ade...beaches, and from Professor Bonney who visited the district \vhen the re-survey was nearly completed and discussed...obscure problems of the geology of the Lizard District with him on the ground. J. J. H. TEALL, Director...CHAPTER I. Introduction ... General features of the district, 1 ; principal towns and villages, 1 ; the Pliocene |
 | | Report (edition) |
| referred to in geological literature as the Lizard District although it forms a part of Meneage, an old Cornish...the very extensive literature relating to the district. Dr. W. Pollard and Mr. E. G. Radley have n1ade...beaches, and from Professor Bonney who visited the district \vhen the re-survey was nearly completed and discussed...obscure problems of the geology of the Lizard District with him on the ground. J. J. H. TEALL, Director...CHAPTER I. Introduction ... General features of the district, 1 ; principal towns and villages, 1 ; the Pliocene |
 | | Report (volume) |
| Serpentinite and Rodingite in the Hunting Hill Quarry, Montgomery County, Maryland By DAVID M. LARRABEE...BULLETIN 1283 Description of rocks exposed in the quarry near the center of the Hunting Hill ultramafite... Geologic map of the Hunting Hill serpentinite quarry __ In pocket 1. Index map showing location of the...Md______________ 3 2. Photograph of the Hunting Hill quarry, 1966___________ .5 3. Photograph of serpentinite...Hunting Hill quarry--------------4. List of minerals identified from the Hunting Hill quarry __ 5. Structuraltrends |
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| results in a pseudo-symmetry, i.e. crystals of lower symmetry are twinned jn such a way that they form...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...identification. Nobody should be discouraged by initial bad luck, it is sometimes difficult even for an expert...should preferably be more detailed, e.g. walls of a quarry, or refuse heap specimen, so that one could find |
 | | 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 |
| | Report (edition) |
| Geology of Cornwall, Devon and West So-merset. The district has now been re-surveyed on the six-inch scale...referred to in geological literature as the Lizard District although it forms a part of Meneage, an old Cornish...the very extensive literature relating to the district. Dr. W. Pollard and Mr. E. G. Radley have made...beaches, and from Professor Bonney who visited the district when the re-survey was nearly completed and discussed...obscure problems of the geology of the Lizard District with him on the ground. J. J. H. TEALL, Director |
 | | 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 |
 | | Journal (article/letter/editorial) |
| Ladysmith (Rosemeyer 1999, the Vulcan Materials quarry in Racine (Scovil 1994), the pegmatites of Florence...marcasite. A major mining district, the Upper Mississippi Valley zinc-lead district, was in these rocks in...and copper minerals were found. Mining in this district ceased in the late 1970s. A branch of the Middle...may have omitted. Adams County Hamilton Mound. A quarry is located in the NE 1/4 sec. 36 T*20N*R.6E.: potassium...converted to a hornfels at the contact with the Mellen gabbro complex: apatite, fayalite, ferroaugite, grunen'te |
 | | Journal (article/letter/editorial) |
| serpentine, while it is in turn cut by veins of gabbro. We next visited the harbour on the north side...rock, viz.: serpentine, troctolite, gabbro (including olivine gabbro) and olivine dolerite, and it is quite...complex had cooled down before their intrusion. The gabbro, on the other hand, is often exceedingly coarsegrained...well-developed foliation, and passes into a true gabbro-schist. A specially fine section is seen in the...serpentine is cut by a broad vein of highly-foliated gabbro across which runs a dyke of nearly massive gabbropegmatite |
 | | Catalog/List |
| .... ..... .. . .. . . .. .. . . . . ...Lehigh Valley, Pennsylvania " . . . . . . . . . . . . . . .... . . . . Bcrgeu . Hil l, J e rsey City, "K. J. Gabbro-Diorite . . . . . . . . . . . . . . . . . . . ... . . . Salem, i\l assach u s e t t s Orbicular Gabbro-Diorite •. . . . . . . . . . . . . D a v i e Coun... . . . . . . . . Quin cy, Florid;:. GABBRO : Bytownite Gabbro . . . . . . . . . . . . . . . . . . ....Diallage-Hypcrsthcnc Gabbro . . . . . . . . . Near I g nacio Rcscn·oir. Colorado Homblende-Gabbro . . . . . . |
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| composition into an opaque amorphous mass with much lower properties, such as refractive index and specific...significantly reduced 18O content (down to <10%), much lower than the 18O composition of the solution after reaction...the apatite, with the presence of NaF producing a lower nucleation density, larger crystals and coarser...to end member FAP, whereas samples reacted with lower F content are probably replaced by hydroxy-FAP (Ca10(PO4)6OHxF2x)...between calcite and hydroxyapatite (13.4%) is lower than between calcite and FAP (14.7%). The replacement |
 | | Report (issue) |
| ............ ........... 36 - iv - Kenora District . . .. . .. .. .. ... .. . .. ... .. . .. . ..... .... . ..... ......... ... 49 Rainy River District . . . .. .. . .. .. ... . . . ... . . . . . ...... ............................. 49 Sudbury District . . . .. . . . . . . .. . . . ... ... . . . ....Henderson and Conley Mines . ......... ........... 3-Lower (third) level at Henderson and Conley Mines ......rocks. It is associated with calcite, dolomite, tremolite, and asbestos in many places. Talc has been mined |
 | | Catalog/List |
| ALLEMONTITE An intergrowth of arsenic and antimony Germany Harz Mountains, Andreasberg Rich gray botryoidal...Black xis and cleal'ages with granite ........ . TREMOLITE Calcium magnesium silicate Arizona Maricopa County...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 |
 | | Journal (article/letter/editorial) |
| three large massifs of ophiolites and associated gabbro (SyumKeu, RaiIz, and Voikar), granitoids, and...comagmatic to them occur east of the ultrabasites and gabbro (Fig. 1). The 618 MANTLE ULTRABASITES OF OPHIOLITE...stripe of rocks composing a dun ite–clinopyroxenite–gabbro complex (Figs. 1, 2a). Gabbroids also compose an...tical section, and gabbroids are hosted in its lower part. This “reverse” stratification pattern is generally...of ultrabasite massifs in the Polar Urals. (1) Lower–Middle Paleozoic rift–bathyal com plexes (paleocontinental |
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| 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 |
