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The sequence lies between Miocene – Lower Pliocene shell limestones and Upper Pliocene – Pleistocene sandy and clayey sediments and consists of horizontal ooidal beds composed mainly of goethite and X-ray amorphous Fe 3+-oxyhydroxides intercalated with siderite and/or rhodochrosite beds.read more
Other articles where Plinthite is discussed: Plinthosol: …into concretions known as plinthite. The impenetrability of the hardened plinthite layer, as well as the fluctuating water table that produces it, restrict the use of these soils to grazing or forestry, although the hardened plinthite has value as subgrade material for roads or even as iron the…read more
Etymology . From iron + stone.. Noun . countable and uncountable, plural ironstones . Any of iron which is impure through the admixture of silica or clay.. 1815, Mungo Park, Travels in the Interior of Africa, Vol. II, Cassell: 1893, Chapter XXI, During my stay at Kamalia there was a smelting furnace at a short distance from the hut where I lodged, and the owner and his ...read more
The Bakchar deposit develops in the south-eastern part of western Siberia 52°01′45″N 82°07′20″E situated 200 km northwest of Tomsk Fig. 1. The occurs as 150 km wide and about 2000 km long deposit in the West Siberian iron basin along eastern and south-eastern borders of the West Siberian Plate Fig. 1a.read more
L. V. Kuleshevichs 14 research works with 25 citations and 140 reads, including: The Multi-Isotope Composition of Sulfur in Sulfides and Microfossils of the Mesoarchean Leksa Pyrite ...read more
Sometimes hosts concretions opal gems. occurs in a variety of forms. The various forms of include siderite nodules deeply weathered saprolite, i.e. and ooidal ironstone. Uses as a source of iron. Ironstone, although widespread, is a limited source of iron Fe. Historically, most of British iron originated from but it is now rarely used for this …read more
Banded iron formations also known as banded formations or BIFs are distinctive units of sedimentary rock consisting of alternating layers of iron oxides and iron-poor chert.They can be up to several hundred meters in thickness and extend laterally for several hundred kilometers. Almost all of these formations are of Precambrian age and are thought to record the oxygenation of the ...read more
Sometimes ironstone hosts concretions or opal gems. Occurrence. Ironstone occurs in a variety of forms. The various forms of ironstone include siderite nodules deeply weathered saprolite, i.e. and ooidal ironstone . Uses Ironstone as a source of iron. Ironstone, although widespread, is a limited source of iron Fe. Historically, most of British iron originated from ironstone, but it is now rarely used for this …read more
approximately 5 m wide, trending 120 degrees, was traced in outcrops for 4 km. In the area of the Pitch- Copper at Wolfe Lake the contains accessory, secondary silicate minerals in decreasing order of abundance: quartz, chlorite, actinolite or hornblende, and epidote. Theread more
Brown mineral data, information about Brown , its properties and worldwide locations. ... ⓘ ⓘ ... Click for further information on this .? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species.read more
In 1895 Mr. John Smith Trans. Geol. Soc., Glasgow, 10, 133, 1895, contributed a paper to this Society, describing a deposit of volcanic ash in Ayrshire, containing bands of . During the following twenty years there was practically nothing done in the way of further exploration of these deposits until the urgent demand for a supply of in this country led Mr. G. V. Wilson ...read more
In Ohio, most occurs in the eastern part of the state. Although it is not as rich in iron as other substances, often is used as an for commercial production of iron. The mineral hematite is about 70% iron and makes the best for that metal. In contrast, less than half of is iron.read more
This paper summarises Phanerozoic deposits worldwide, including Australian deposits such as the well-known channel iron deposits CIDs. Nearly 400 have been catalogued...read more
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