 | | Book | | another large group of minerals, such as the dark sphalerite, cassiterite, rutile, etc., it is rather difficult...is harder (6) than chalcopyrite (4.5). Black sphalerite and black cassiterite display the same submetallic...by their degree of hardness. The hardness of sphalerite is 3.5, and of cassiterite 6.5. A supplementary...distinctive feature may be the frequent association of sphalerite with other sulphides, and of cassiterite with...interesting minerals can also be found on heaps of mine refuse, but never enter abandoned shafts or caves | | | Book | | another large group of minerals, such as the dark sphalerite, cassiterite, rutile, etc., it is rather difficult...is harder (6) than chalcopyrite (4.5). Black sphalerite and black cassiterite display the same submetallic...by their degree of hardness. The hardness of sphalerite is 3.5, and of cassiterite 6.5. A supplementary...distinctive feature may be the frequent association of sphalerite with other sulphides, and of cassiterite with...interesting minerals can also be found on heaps of mine refuse, but never enter abandoned shafts or caves | | | Book | | another large group of minerals, such as the dark sphalerite, cassiterite, rutile, etc., it is rather difficult...is harder (6) than chalcopyrite (4.5). Black sphalerite and black cassiterite display the same submetallic...by their degree of hardness. The hardness of sphalerite is 3.5, and of cassiterite 6.5. A supplementary...distinctive feature may be the frequent association of sphalerite with other sulphides, and of cassiterite with...interesting minerals can also be found on heaps of mine refuse, but never enter abandoned shafts or caves |  | | Book | | compounds (eg pyrite, chalcopyrite, galena and sphalerite) c.:hange into oxygen salts (eg malachite, azurite...quartz}, heavy minerals of a specific gravity 4-6 (sphalerite and barytes), and very heavy minerals of a specific...(534) - tridymite (461) - cristobalite (462); sphalerite (181) - wurtzite (184); pyrite (436) - marcasite...localities, the luminescence is not constant (eg sphalerite, calcite, opal or topaz), and the phenomenon...Occurrence: common; Clay region in Alabama (USA); Harz (GDR), FRG, Botogol deposit (USSR); metamorphic | | | Book | | illustrated Encyclopedi of the World’s Rocks and Mine re L A R E N MI OF THE WORLD Rudolf Duda and...compounds (eg pyrite, chalcopyrite, galena and sphalerite) change into oxygen salts (eg malachite, azurite...quartz), heavy minerals of a specific gravity 4—6 (sphalerite and barytes), and very heavy minerals of a specific...(534) — tridymite (461) — cristobalite (462); sphalerite (181) — wurtzite (184); pyrite (436) — marcasite...localities, the luminescence is not constant (eg sphalerite, calcite, opal or topaz), and the phenomenon |  | | Book | | 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...pyrite, chalcopyrite, pentlandite, milerite, sphalerite, etc. ** The intercontinental rift deposits:...with e q u i g r a n u l a r calcite and fine mafic mine r a l s a n d a p o i k i l o b l a s t i c g a |
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