which has more iron pyrite hematite ore siderite

    What Type of Rock Is Magnetic?,  · Lodestone, which is a big piece of magnetite, is strong enough to magnetize iron. Lodestone was used to make the first compasses according to the Department of Geology at the University of Minnesota. Other types of igneous rocks that contain magnetic properties include hematite.Iron and steel,  · Hematite and magnetite have about 70 percent iron, limonite has about 60 percent, pyrite and siderite have 50 percent, while taconite has only 30 percent. Using a combination of both deep mining (under the ground) and opencast mining (on the surface), the world produces approximately 1000 million tons of iron ore each year, with China responsible for just over half of it.Hematite Information,  · Hematite is an iron oxide mineral which is technically made up of 70% iron and 30% oxygen (though rarely found that pure). Its usual appearance is a silver to dark gray, smooth gemstone cut into variously shaped cabochons and very rarely faceted. There are a few ...Iron Ore of Vietnam, a Valuable Mineral Resource | ,  · Region Iron ore reserves Main types of iron ore Iron ore grade Main distributed area Northwest More than 0.2 billion tons Limonite, magnetite 38-55% Lao Cai, Yen Bai, Phu Tho, Vinh Phuc Northeast More than 0.5 billion tons Magnetite, goethite 42-60% Ha GiangIron ore,  · Iron ores[1] are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red. The iron is usually found in the form of magnetite (Fe 3O 4, 72.4% Fe), hematite (Fe 2O 3, 69.9% Fe), goethite (FeO(OH), 62.9% Fe ....

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    Metal Profile: Iron Properties and Characteristics,  · Characteristics Pure iron is a silver-colored metal that conducts heat and electricity well. Iron is too reactive to exist alone, so it only occurs naturally in the Earth's crust as iron ores, such as hematite, magnetite, and siderite.Cinnabar,  · Iron-ore mining developed much later into a major enterprise. The whole hydrothermal vein swarm in the area hosts many places with typical siderite-cinnabar-tetrahedrite ores. Other notable places are: In Serbia: Mount Avala; In Kazakhstan: Hydercahn, in the Fergana Basin; In Kyrgyzstan: Chauvai, Alai Range; In Ukraine: Nikitovka (Horlivka), Donets'ka Oblast; In the Philippines: Puerto ...FMF,  · I'm from central Texas and I have picked up tons of them over the years. They are iron concretions. I have found them as relict pyrite cubes and amorphous masses. Possible minerals are siderite, limonite and hematite all usually weathered more or less into red and ...