 | | Journal (article/letter/editorial) | | ABTICLES. I.—ON THE DIAMOND F I E L D S OP SOUTH AFRICA. By T. RTJPEKT JONES, F.G.S., Professor of...DIAMOND BEGION.—The diamond-bearing region in South Africa, as at present known, is chiefly within the...Eiver). Bloemhof on the Vaal, two hours (12 miles) south-west of Potscherfstroom (Transvaal), is the reported... Kalk Farm (near Litkatlong), etc.; and on the south side of tiie Orange Eiver, they have been found...Modder, about 100 miles south by east of Xifkatleng; also a few miles south of Winburg (also in the Orange |  | | Journal (article/letter/editorial) | | contender of the mineralogical literature of southern Africa ….” If this were a boxing match review, this could...Kimberley, South Africa, has put into it. Von Bezing is a well-known collector of southern Africa minerals...Early German Geologists and Entrepreneurs in South West Africa” and “The People—Mineralogists, Geologists...Knoxville] at 15:01 31 December 2014 ties from north to south in Namibia and ending with a chapter on Namibian...Cairncross University of Johannesburg Auckland Park, South Africa Agates: Treasures of the Earth by Roger Pabian |  | | Journal (article/letter/editorial) | | Dorn, N., and Slagt, C , eds. 1976. Republic of South Africa postage stamp catalogue. Johannesburg, R.S.A...Michel stamp catalogue. Overseas South Africa and South-West Africa. 1973. Munchen, Germany. Rhodesian...angolensis AUSTRALIA 1973-1975 6 c chrysoprase 7 c agate 8 c opal 9 c rhodonite 10 c star sapphire (1974)...1974 1 c amethyst 2 c agate 3 c quartz 4 c niccolite 5 c moss agate 7 c agate 10 c stilbite 15 c Moshaneng...and frog fossil 80 h rocks, basalt, and polished agate 1.00 k Pelecypod 1.60 k Trilobite BRAZIL June 8 |  | | Journal (article/letter/editorial) | | A~'~ICA. Pebble of peculiar Agate-breccia, with ancient fractttre. Subangular Agate, various ; and fresh fragments...fragments of Agate, Subangular piece of Magnetite. :No. 26. From the T'somo, No. 2. Page 14. Coarse grey...~he GEOL06Y of the DIA~OI~D-FrELDS of SOVTH AFRICA. By Dr. J o ~ Saxw, Colesberg, Cape Colony. (Communicated...country from the tremendous denudation going on in South Africa, with its excessively dry climate, its intense...They are mainly of basalt, amygdaloid, sandstone, agate, peridot, garnet, tourmaline, quartz, jasper of |  | | Journal (issue) | | Connecticut Bench Tip: Depth gauge for drilling ..... p. Agate in fossil.........................................prehnite to be described as a mineral came from South Africa. Abraham Gottlieb Werner, who named many minerals...Hendrik von Prehn, a commander of Dutch forces in South Africa’s Cape Colony. Prehn found the original specimens...a person and the first to be described from South Africa. Although prehnite is not a zeolite, it is commonly...Quarry) on the north side of U.S. Route 50 near South Riding; the Bull Run Quarry (Luck Stone Bull Run |  | | Journal (article/letter/editorial) | | time to visit. Among these are miles of badlands south of Roosevelt, offering mammal bones and turtle shells...generations. Fossil remains of giraffe discovered in South Africa ARCHEOLOG1STS working on the Hopefield site...site about 60 miles northwest of Cape Town, South Africa, have discovered the fossil remains of an extinct...sandy surface of the one-time lagoon. Union of South Africa Government Information Office July 18, 1957...open-air vacationer. Hundreds of mine dumps, miles of agate beaches, increasing numbers of modern motels and |  | | Book (edition) | | Engraving on stones 54 Cutting and polishing agate 55 Cutting and polishing colored stones Cutting...its green color), to their place of discovery ("agate" after a river in Sicily), and lastly to their alleged...malachite and azurite Hessonite garnet Pyrope garnet Agate pseudomorphous after coral Cracked rock crystal...aventurine quartz Cinnamon stone Colorado ruby Coral agate Craquelees Cross stone Cymophane Danburite Daourite...starstone Greens tone Hawaiite Heliocite Iceland agate Imperial jade Inca stone Indian jade J2 Commercial |  | | Book | | cut diamond in the world is known as The Star of Africa and weighs 530.2 metric carats. It forms the centre...known stone and are practically indestructible. South Africa produces nearly all the world 's output of diamonds...have to be excavated. ,.. Emerald Columbia in South America is where the best emeralds are found. Perfect...are found in many parts of the world, notably in Africa and Brazil. _ _ Cilrine_ _______ r ~ Like amethyst...to mis - fortune. Tourmaline -is found mainly in South America. -" ~-Peridol ---..... This lovely olive |  | | | | images Front cover top Agate from Germany; bottom Agate from Scotland. Back cover Agate from Germany. Title...Title page Agate from Russian Arctic coast. Distribution NBN International Estover Road Devon PL6 7PY ...is an agate? Properties of agates Sources of agates Europe Britain USA Canada Mexico South America...America Africa Asia Australia 108 111 122 131 138 144 Lapidary 150 Uses of agates through the ages 158...different geological environments. Since the mid-1900s, agate collecting has become very popular in Europe, North |  | | Journal (article/letter/editorial) | | from the Butha-Buthe District LESOTHO, SOUTHERN AFRICA T All specimens featured here were collected...in southern Africa, landlocked and surrounded on all sides by the Republic of South Africa. The entire...Johannesburg PO Box 524, Auckland Park 2006 Gauteng, South Africa brucec@uj.ac.za HERMAN du PLESSIS 10 Howick...Webb Street, Farramere Benoni 1501 Gauteng, South Africa hermanusduplessis@yahoo.com Figure 1. A typical...William Besse. Figure 5. A typical gray-brown agate (polished) from the Drakensberg basalts, 5.2 cm |  | | Book (edition) | | Properties of Gemstones Cutting and Polishing Agate 60 Hardness 19 Cutting and Polishing Colored Stones...Chrysoprase 128 Heliotrope 128 Dendritic Agate 130 Moss Agate 130 Agate 132 Jasper 146 Fossilized Wood 148...center below "Cullinan II." (or "Lesser Star of Africa") with 317.40ct. It is the seconddiamond in the...term colored stones all precious stones except agate and diamond. Colored Precious Stone (also for ...for its green color), their place of discovery ("agate" for a river in Sicily), or mysterious powers ("amethyst" |  | | Book | | Images Front cover top Agate from Germany: bottom Agate from Scotland. Back cover Agate from Germany. Title...Title page Agate from Russian Arctic coast. Distribution NBN International Estover Road Devon PL6 ?PY UK...Introduction 4 Names of agates 6 What is an agate? 10 Properties of agates 44 Sources of agates...58 USA 76 Canada 108 Mexico 111 South America 122 Africa 131 Asia 138 Australia 144 Lapidary...geological environments. Si nce the mid-1900s, agate collecting has become very popular in Europe, North |  | | Journal (article/letter/editorial) | | in Tampa Bay (Hillsborough Co., Fla.) along the south side of the west end of Courtney Campbell Causeway...photo reads: "A few cabochons made from the moss agate I collected in the Hardin district, near Billings...locality last June, (1952) but find good Montana agate very scarce." NEBRASKA — The following item, dated...Baker ranch in Luna Co., N . M., about 40 miles south of Deming. N E W YORK—A letter dated Feb. 13, 1953..."The quarries are on Chestnut Ridge several miles south of the main line of the Penn. R. R.—some above Hillside |  | | Book (edition) | | Production of Gemstones oS 70 Cutting and Polishing Agate 71 Cutting and Polishing Colored Stones _ Cabochon...Rhodochrosite Dendritic Agate 146 184 Rhodonite Pyrope 120 Kimandite 120 Moss Agate 146 Agate 148 : 186 Turquoise...center below “Cullinan II." (or “Lesser Star of Africa’) with 317.40ct. It is the second-largest polished...for its green color), their place of discovery (“agate” for a river in Sicily), or mysterious powers (“amethyst”...Thaumasite Vanadinite Wurizite Zincite trigonal Agate Achroite Amethyst Amethyst Quartz Ametrine Ankerite |  | | Journal (issue) | | November‐December 2016 Page 6 Crawford Fairburn Agate Field Trip with CMS – October 1‐2 Brian Walko We...Sugar Loaf Butte to a little reservoir south of the road. Agate beds all around it. We found a lot of...of black petrified wood, prairie agate, and some picture agate. No fairburns. Most of these finds were...newly eroded sides of cattle trails. It seems the agate beds were picked over. Flatirons Facets, November‐December...Notheis and his rockhound dog, Annie, ventured south to a dried pond. Kevin found a lot of chalcedony |  | | Book (volume) | | W O TIIOU SAN D YEARS OLD I. Agate, A1n e th yst, Topa z, Garnet AGATE "Achates" - such was the name...culture the predilection of the Grceks for the agate was taken over by the Romans, and they too, like...immense variety of specimens found has made the agate a pre-eminently attractive object for the passion...collectors. In its mineralogical composition the agate belongs to the stone-fami1y of thc. cristalline...also the form of agate geodes weighiag as much as two and a half tons. Th e agate is treated in the |  | | Journal (article/letter/editorial) | | (specimen and cut stones), N'Chwaning mine, Hotazel, South Africa. Martin Zinn specimen and gemstones, Erica and...from Mount Malosa, Malawi, B. Cairncross, 31-37 Africa, azurite, 4043; classic and recent specimens, 44-46;...artist Rainer Jackle, 38-39; minerals named after South Africans, 48-53; Mount Malosa, Malawi, 31-37; Rhodes/rhodesite...25-30 Africa Comes to Arizona: A Tucson Gem & Mineral Show Preview, R. W. Jones, 60-61 Africa-Earth...R. I. Gait, 25-30 Agardite-(Y), New Mexico, 301 Agate, Colorado, 233, 252-68; Michigan, 387 Aikinite, |  | | Journal (article/letter/editorial) | | THE PRAIRIE STATE ROCK AGATE-NEBRASKA'S The larger, more colorful prairie agates are usually used as... the prairie agate, has been selected as the State Rock of Nebraska. The prairie agate does not really...really fall within the definition of agate, but is a layered chert without the strong banding characteristics...brilliant polish. NOVEMBER 1975 Subscribe to— SOUTH A F R I C A N LAPIDARY MAGAZINE (3 Issues Per A...rockwise in sunny South Africa? Read all about it in the official organ of the Federation of South African Gem |  | | Journal (issue) | | deposits of Elsmore, New England district of New South Wales. Rankin, John, Sharpe, James L. and Williams...associated minerals from the Barrington Tops area, New South Wales. Graham, Ian T., Pogson, Ross E. and Colchester...ribbons associated with thomsonite from Borambil, New South Wales. Graham, Ian T. and Pogson, Ross E. 7(2):S7-61...Kasolite from the British Empire mine, Arkaroola, South Australia. Plimer, Ian R., Besley, Robert and Brugger...chromitites-Tumut Serpentinite Province, southern New South Wales. Graham, Ian T., Franklin, BrendaJ. and Marshall |  | | Journal (article/letter/editorial) | | Geochemistry, University of Cape Town, Rondebosch 7700, South Africa I am grateful to Saunders for comments concerning...have been achieved before each new layer of the agate my interpretation of systematic differencesbetween...much of the crit- of colloidal silica into the agate-formingcavities at [the] icism of my model is pertinent...and O'Neil, 1977, Fig. 7). This is the minimum agate, rather that "high 6'80 values in the fluid would...fluids to be similar (e.g., in zones B-F in agate I and in agate 2). The reason why I preferred a model in |  | | Journal (article/letter/editorial) | | Geochemistry,University of Cape Town, Rondebosch7700, South Africa Ansrnacr Oxygen-isotopeprofiles through six...microcrystalline quartz (MQ) zones within the same agate, with the Q zonesbeing, on average,37- lighter than...alteration. The aim of this paper is to use the agate oxygen-isotopedata to determine the temperature...this study. Agate numbers and zone letters correspondto those ofTable l. The photograph of agate I shows... 478 TABLE1. Oxygen-isotopeanalyses of agates Agate Zone A B c D E F A B c A B c D E A B c A B c A |  | | Book | | Brazilian ones suffered the same fate when in 1870 the South African sources, to this day the most important...there is also a number of secondary sources in South Africa, often in alluvial deposits. In the 1950’s,...deposits exist in the Congo, Tanzania, Rhodesia, South West Africa, Venezuela, and other places. Among historical...biggest diamond ever found was discovered in South Africa and was named after the president of the mine...ROSE-OQUARTZ, CHR YSOPRASE, TIGER'S-EYE, AVENTURINE AGATE. Abra: One of the most commonly found minerals |  | | Book (edition) | | 69 Engraving on Stones 70 Cutting and Polishing Agate 71 Cutting and Polishing Colored Stones Cabochon...144 190 Sodalite 144 Dendritic Agate 146 114 Chrysoberyl Moss Agate 146 116 Spinel Layer Stones ... g 190 Azurite 192 Malachite Agate 148 Ti 176 180 Feldspar Group Chrysoprase Precious Beryl 112...center below “Cullinan II." (or “Lesser Star of Africa”) with 317.40ct. It is the second-largest polished...for its green color), their place of discovery (“agate” for a river in Sicily), or mysterious powers (“amethyst” |  | | Journal (article/letter/editorial) | | “Crystals That I’ve Known,” “Damn the Glaciers,” “Agate Lickers,” “Diggin’ in a Hole,” “Highway 17,” “Gold...familiar music of the chorus is very comfortable. “Agate Lickers,” cowritten by Robert T. Downs, is a tonguein-cheek...Struik Nature, PO Box 1144, Cape Town 8000, South Africa. 384 pages; 2013; $85 (hardbound). For those...Minerals of South Africa (Cairncross and Dixon 1995), The Manganese Adventure: The South African Manganese...descriptive and geographic mineralogist in southern Africa, maintains a large private and research mineral |  | | Journal (issue) | | orchestras. Mozart at the The"ApacheHoodedOwl"Agate(heightof "owl" app.5 cm)from Rancho LaVinata,Ejideel...people say "only agate" but the special exhibit demonstrated, there is no 'only' about agate! The special...theme of agate - we got a tour of well-known and not so known agate producing localities, weird agate properties...properties and appearances, and in particular superb agate carvings from the finest craftsmen of Idar-Oberstein...seeing Larry Conk.lin's collection of 'eye agates' - agate nodules cut to show circular, concentric banding; |
|
Northern Cape, South Africa