 | | Journal (article/letter/editorial) | | contains a mixture of chamosite, goethite and hematite ooids, and it is suggested that the two latter...Germany, the U.K. (England, Wales), Poland, the Czech Republic (Bohemia) and other places (H.L. James, 1966)...(goethite, limonite) dominate, but chamosite, hematite and phosphate ooids also occur. At two localities...chamosite ooids are primary, whereas goethite and hematite ooids might be derived from chamosite by early...from the island ijland (Sl to S8), the Siljan district (S12 to S21), Gotland (S9 to Sl l), northern |  | | Journal (article/letter/editorial) | | samples are from 31 localities and 8 countries (Czech Republic, France, Germany, United Kingdom, Egypt, Nigeria...Ketteless Member Scunthorp (slightly ferruginized) Czech Republic Nučice; Chrustinice; Zdice; Krušná hora...and chamosite), or opaque (pyrite, goethite and hematite). Therefore the ironstones were investigated in...ferruginized. The newly formed goethite and/or hematite is admixed with relics of chlorite. Rice-grain...ironstone (Bleckenstedt), Salzgitter district. (F) Pseudomorphs of hematite after aggregates of rice-grain |  | | Book | | "Broadly regarded, the depth ta which a metalliferous region has been eroded affects its present characteristics...multiphase, nested, and include a subsidence of the central block and the downward passage of tabular plutons...Peru, map and distribution of ore deposits in the central sector. Based on the Mapa Metalogenico del Peru...Batholith near Arequipa, Toquepala-Cerro Verde district; in the centre, Morococha and in the north, Michiquillay)...-striking fissure veins and branching vein sets from a central copper zone (with a small segment rich in quartz-molybdenite |  | | Book | | "Broadly regarded, the depth to which a metalliferous region has been eroded affects its present characteristics...multiphase, nested, and include a subsidence of the central block and the downward passage of tabular plutons...Peru, map and distribution of ore deposits in the central sector. Based on the Mapa Metalogenico del Peru...Batholith near Arequipa, Toquepala-Cerro Verde district; in the centre, Morococha and in the north, Michiquillay)...-striking fissure veins and branching vein sets from a central copper zone (with a small segment rich in quartz-molybdenite |  | | Journal (article/letter/editorial) | | average of 1.6 ppm Fe z+ throughout the suboxic region. Cherty iron formations are attributed to low-temperature...I1 Ma Mc Mg Mh Mn No Ph Po Px Py Re Sd St Vv hematite hypersthene ilmenite martite marcasite magnetite... Perry et al. (1973) hypothesize that primary hematite and 12C-enriched organic matter reacted diagenetically...local increase in organic productivity, as in a region of persistent Biota: Why are Fe3SiaOs(OH)°: ...shelf (Muessig, 1984). Compression dominates the region east of the Cariaco Basin and it is here that exhalation |  | | Book | | mineral particles (eg inclusions of chlorite and hematite in jasper). Allochromatic minerals display other...unaltered crystals of the same mineral. For instance, hematite (hardness 6) will have a lower hardness in the...named from the colour of their streak, such as hematite - blood, crocoite - saffron and xanthocone - yellow...mineral magnetite; to a lesser extent by pyrrhotite, hematite and wolframite. A large number of minerals are...deposits in Texas and Louisiana (USA), Tarnobrzeg region and Mach6w (Poland), Karakum Desert and Volgaland | | | Book | | mineral particles (eg inclusions of chlorite and hematite in jasper). Allochromatic minerals display other...unaltered crystals of the same mineral. For instance, hematite (hardness 6) will have a lower hardness in the...named from the colour of their streak, such as hematite — blood, crocoite — saffron and xanthocone — yellow...mineral magnetite; to a lesser extent by pyrrhotite, hematite and wolframite. A large number of minerals are...deposits in Texas and Louisiana (USA), Tarnobrzeg region and Machow (Poland), Karakum Desert and Volgaland |  | | Book | | SEVER, Editors SILICEOUS DEPOSITS IN THE PACIFIC REGION 37 A. SlNGERand E. GALAN, Editors PALYGORSKITE-SEPIOLITE:...in the overburden of Bekhat6w Brown Coal Mine (Central Poland), by A.J. Van Loon and K. Brodzikowski ...OVERBURDEN OF THE BELCHATOW BROWN-COAL M I N E (CENTRAL POLAND): A PREDICTIVE TOOL REGARDING ENGINEERING-GEOLOGICAL...in the overburden of Bekhatbw Brown Coal Mine (Central Poland), by A.J. R n Loon and K.Brodzikowski According...ferric hydroxide, which subsequently dehydrated to hematite. In the second part, an additional model for red |
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