Ironstone is a name for any sedimentary rock that is cemented with iron minerals There are actually three different kinds of ironstone but this one is the most typical The official descriptor for ironstone is ferruginous (fer-ROO-jinus) so you could also call these specimens ferruginous shale—or mudstone Iron Ore Formation Iron formation consists of iron ore such as siderite magnetite and hematite with silica in the form of chert jasper etc generally in bands but sometimes not distinctly so The bands of iron ore are at times high-grade but are often mixed with a good deal of silica the whole making an ore too lean for use without

Iron Ore ~ Learning Geology

The iron ore deposits are found in sedimentary rocks They are formed by the chemical reaction of iron and oxygen mixed in the marine and fresh water The important iron oxides in these deposits are hematite and magnetite These are ores from where iron is extracted

Iron ore was first discovered by European settlers when the early land surveyor William Austin Burt was shown iron ore by an Indian chieftain near what is now Negaunee Michigan in 1844 He had noticed a strange movement of his compass needle while surveying near where the present town of Ishpeming is located

There are two primary sources of iron ore in Maryland: igneous and sedimentary I choose to focus on one of the sedimentary iron ores the so-called Arundel ores or bog iron ores of the Potomac Group THE ORIGIN OF THE IRON INDUSTRY IN MARYLAND Captain John Smith is generally credited with the discovery of iron ore in Maryland

Ore Minerals Image Credits: bonchan/shutterstock Ore Minerals An ore is a natural occurrence of rock or sediment which contains enough minerals with economically important elements typically metals that can be extracted from the deposit economically

Windarling Iron Ore Mine Mount Jackson Goldfield Yilgarn Shire Western Australia Australia : The Windarling Iron Ore Mine is 27 kilometres north of Mount Jackson and 135 kilometres north of Southern Cross The mine is operated by Cliffs Natural Resources who also operates iron ore mines at

Iron Ore (Fe) Minerals Deposits in Nigeria

Nigeria is among the African countries with vast iron ore deposits which can be found in some states in the country Itakpe in Kogi State is believed to have the purest deposits of iron ore and other states where it is deposited includes: Abia Anambra Bauchi

Banded iron formation (BIF) is the principal source of iron BIF is a rock type composed of alternating silica- and iron-rich bands Banded iron formation is economically among the most important rock types as our society is heavily reliant on iron which is mostly extracted from this rock

Iron Formation: The Sedimentary Product of a Complex Interplay among Mantle Tectonic Oceanic and Biospheric Processes * ANDREY BEKKER 1 † JOHN F SLACK 2 NOAH PLANAVSKY 3 BRYAN KRAPEŽ 4 AXEL HOFMANN 5 KURT O KONHAUSER 6 AND OLIVIER J ROUXEL7 8 1Department of Geological Sciences University of Manitoba Winnipeg

Dec 25 2019Sedimentary rocks are not as rich in minerals of economic value as the igneous rocks But important minerals such as hematite iron ore phosphates building stones coals petroleum and material used in the cement industry are found The decay of tiny marine organisms yields petroleum Petroleum occurs in suitable structures only

Most deposits of iron ore in the world are found in rocks known as banded iron formations (BIFs) These are sedimentary rocks that have alternating layers of iron-rich minerals and a fine-grained silica rock called chert Many of the banded iron formations that are being mined today were formed millions of years ago

• From the 1840s to the 1960s more than 3 billion tonnes of iron ore were mined from sedimentary-hosted high grade iron ore deposits in Michigan Minnesota and Ontario • This abundant source of iron ore coupled with new steelmaking processes helped fuel rapid industrial expansion in North America and Europe

Is concrete an igneous or sedimentary or metamorphic rock? Rocks are classified as igneous sedimentary or metamorphic 95% of the outer 10 miles of the earth's crust is composed of igneous and metamorphic rocks but 75% of the rocks exposed on the surface of the earth are sedimentary

The iron ore deposits are found in sedimentary rocks They are formed by the chemical reaction of iron and oxygen mixed in the marine and fresh water The important iron oxides in these deposits are hematite and magnetite These are ores from where iron is extracted

Sedimentary rock

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Aug 25 2013 - Iron Ore is a chemical sedimentary rock that forms when iron and oxygen (and sometimes other substances) combine in solution and deposit as a sediment Hematite (shown above) is the most common sedimentary iron ore mineral The specimen shown above is about two inches (five centimeters) across

Taconite is an iron-bearing high-silica flint-like rock It is a Precambrian sedimentary rock referred to as a banded iron formation due to the typical alternating iron-rich layers and shale or chert layers The very finely dispersed iron content present as magnetite is generally 25 to 30%

6 2 Chemical Sedimentary Rocks Some ancient chert beds — most dating to between 1800 and 2400 Ma — are also combined with a rock known as banded iron formation (BIF) a deep sea-floor deposit of iron oxide that is a common ore of iron (Figure 6 14) BIF forms when iron dissolved in seawater is oxidized becomes insoluble and sinks to

Dec 16 2015The study area forms part of an emerging iron ore province of southern Cameroon Geochemistry analyses reveal that the siliceous itabirite has a very simple chemical composition with Fe 2 O 3 and SiO 2 representing more than 96 wt % of the average composition suggesting chemical precipitates of silica and iron Low Al 2 O 3 and TiO 2

Sedimentary rocks of these kinds are very common in arid lands such as the deposits of salts and gypsum Examples include rock salt dolomites flint iron ore chert and some limestone Organic Sedimentary Rocks: Organic sedimentary rocks are formed from the accumulation of any animal or plant debris such as shells and bones These plant and