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To: Richnorth who wrote (82496)	2/24/2002 10:48:53 PM
From: E. Charters	Respond to of 116756

<pedantic> Hematite may be red coloured in nature, in large scale, or black, steely grey or metallic silvery too. Polished rock formations are quite beautiful and make the most fascinating coffee tables. So does taconite which is magnetite interlaced with red or green silica layers, called chert, an iron-colourated variety of opal. This iron formation is very hard and would be difficult to process but would make a highly salable decorative stone. I have often thought that the best use of worked out iron ore pits would be to make building stone which could be used as facing in the rebuilding of bombed out office buildings. Red Ochre is the powdered variety of Haematite. It is the familiar jeweler's rouge or polishing/lapping powder. Limonite is the oxide of iron found in nature that is brown or yellow/red and is in accreted masses or rusty grains. It was thought to be hydrated Fe2O3 but it now known to be various minerals, goethite, FeO-OH, lepidocrosite, (cryptocrystaline Fe2O3), and turgite, which is hematite with water. Limonite also contains various iron hydroxide, as you would expect from a hydroxyl oxidation process in nature. Gossan (iron hat), and bog-iron are, and laterite may be, limonite, coloured from yellow to red to brown to black. You can buy convertibles from some Detroit concerns that will convert from martensite to limonite without any effort on your part at all. Deposits of these limonites can be often seen by the roadside, and some classes of people make a living removing them from thoroughfares. </pedantic> EC<:-}