LIMONITE

līmˈənīt or brown hematitehĕmˈətīt, hēˈ–, yellowish to dark brown mineral, a hydrated oxide of iron, FeO(OH)·nH2O, occurring commonly in deposits of secondary origin, i.e., those formed by the alteration of minerals containing iron. Both iron rust and bog iron ore are limonite. It serves as a pigment (see ocher) and as an ore of iron. It is found mainly in Austria and England.

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The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

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Questia Books and Articles on: Limonite
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books on: Limonite  - 141 results

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...oxides. Some so-called limonite is a minutely crystalline...This mineral, unlike limonite, contains a definite amount of water. Some limonites show a transition to goethite...crystalline it closely resembles limonite. When more coarsely crystalline...
...alteration may be revealed by the presence of limonite at the surface. Limonite refers broadly to minerals bearing oxides and...observed in the near infrared. The presence of limonite, either as a primary mineral or secondarily as...
...Level 50-75 cm. Andesite Quartz Mica. schist Limonite or hematite Gneiss Misc. Total Andesite Quartz Mica. schist Limonite or hematite Gneiss Misc. Total Andesite Quartz Mica. schist Limonite or hematite Gneiss Misc. Total Andesite Quartz...
...Characteristics red streak . Hematite is the most important iron ore. "LIMONITE." Microscopic study shows that the ma terial called limonite is not a single mineral. Most "limonite" is a very finely crystalline variety of the mineral GOETH ITE...
...7 1928 FIG. 104. Coarse cellular limonite derived from chaleopyrite in a quartz...Vol. 25, No. 6 1930 FIG. 105. Limonite sponge derived from bornite. Blanchard...125, No. 7 1928 FIG. 107. Cellular limonite derived from finely disseminated chalcocite...
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journal articles on: Limonite  - 24 results

       More journal Results: 1-10 11-20 21-24 >>  
 
...had been a major center. Hematite and Limonite Five pieces of hematite, weighing a...Ray 1996:80). One piece of earthy limonite (12.4 g) was recovered from the 1997...80). Like the earthy hematite, this limonite likely derived from the eastern Plains...
...limestone, graywacke, and possibly limonite, occur in trace frequencies across bannerstone...in the prevalent use of siltstone and limonite. Of the 12 specimens in the entire Claflin...other Double-Edged forms were made from limonite, the only examples in the collection...
...However, Hegde did note the collection of limonite rocks from the surface of the basal laterite...deep to light red lumps of hematite and limonite (1973 : 417). When roasted, the limonite--lighter red to yellow depending on hydration...
...carbonate FeCO^sub 3^) with a weathered limonite patina (iron hydroxide-FeO(OH...produced from concretionary siderite with a limonite patina (Figure 5). On the associated...hardness of only 3.5-4 and that of limonite is 5-5.5. Chert, with a hardness...
...consist of a greenstone celt fragment (n = 1), an elliptical limonite object with no use wear patterns, a ground and engraved steatite...lapidary industry in the pendants, gorget fragment, and the limonite object. Ground hematite fragments were also recovered (n...
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magazine articles on: Limonite  - 4 results

 
 
...mineral composition of Zipaquira salt (85 percent chloride of sodium and 15 percent carbonized clays, with trace elements of limonite, dolomite, quartz, pyrite, and sulfur); the structural security factor achieved by the cathedrals design; the compression...
...fallen log and permeated its cells, crystallizing into quartz and eventually producing petrified wood. In this specimen, limonite (an iron oxide) contributes to the bright central arc, while fine spherules of hematite (another iron oxide) suffuse the...
...produce additional minerals that lend their color and appearance to the resultant marble. For instance, trace amounts of limonite impart a yellowish brown color; serpentine, hornblende, and diopside produce varying tones of green; minute quantities...
...species (37 to date), and estimate a mammoths age by measuring its teeth. But our main task was to remove the tan-- colored limonite and gypsum sediments that cover the bones-in other words, to move dirt. And there is plenty of it. There is dirt, dirt...


 

newspaper articles on: Limonite  - 21 results

       More newspaper Results: 1-10 11-20 21-21 >>  
 
...nickel is present in two ore types-limonite ore, which appears at the surface as...rocky materials that occur beneath the limonite. Many companies only extract the saprolite...by pyrometallurgy or smelting, while limonite is treated by hydrometallurgy, a process...
...ore was shipped to Japanese customers, 471,400 WMT of low-grade saprolite and limonite ore was delivered to Chinese customers, and 674,300 WMT of limonite ore was delivered to Coral Bay hydrometallurgical processing plant. Only Nickel Asias...
...ore from laterites," he said. The China, however, are interested in limonite because it has better recovery rate and their existing process is designed for limonite iron ore, which the Philippines has also existing deposits. Initial plans...
...a glassy sheen when polished. The exception is the necklace of opaque turquoise beads, this variety exhibiting the black limonite veins which give it the name of spider-web turquoise or turquoise matrix. Turquoise has been commonly used in jewellery...
...production output in three years.The project involves the production of nickel-cobalt mixed sulfides from low grade ore and limonite by adopting the High Pressure Acid Leach (HPAL) technology. This technology involves higher value added processing and clearly...
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encyclopedia articles on: Limonite  - 6 results

       More encyclopedia Results: 1-6 >>  
 
LIMONITE lim nit or brown hematite hem tit, he , yellowish to dark brown mineral...alteration of minerals containing iron. Both iron rust and bog iron ore are limonite. It serves as a pigment (see ocher ) and as an ore of iron. It is found...
BROWN HEMATITE see limonite . ____________________ Copyright 2009 Columbia University Press. Used with the permission of Columbia University Press. All rights reserved.
...mineral is widely distributed throughout the world and is responsible for the red coloration of many sedimentary rocks. See limonite . ____________________ Copyright 2009 Columbia University Press. Used with the permission of Columbia University...
...clay, used as a pigment . It occurs naturally as yellow ocher (yellow or yellow-brown in color), the iron oxide being limonite, or as red ocher, the iron oxide being hematite. Ocher grades into sienna, a yellow-brown pigment containing a higher...
...and minerals are abundant and widely distributed. The principal ores of iron are hematite (ferric oxide, Fe 2 O 3 ) and limonite (ferric oxide trihydrate, Fe 2 O 3 3H 2 O). Other ores include siderite (ferrous carbonate, FeCO 3 ), taconite (an...
More encyclopedia Results: 1-6 >>

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