Banded iron formation

Dolomite

Banded iron formation and Dolomite

Banded iron formation

Dolomite

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Definition

Banded iron formation are distinctive units of sedimentary rock that are almost always of Precambrian age

Dolomite is a sedimentary rock containing more than 50 percent of the mineral dolomite by weight

History

Origin

Western Australia, Minnesota

Southern Alps, France

Discoverer

Johann Gottlob Lehmann

Dolomieu

Etymology

From its formation process

From French, from the name of Dolomieu (1750–1801), the French geologist who discovered the rock

Class

Sedimentary Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Other Categories

Coarse Grained Rock, Opaque Rock

Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Banded, Trellis

Earthy

Color

Red, Reddish Brown

Black, Brown, Green, Grey, Pink, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Layered, Banded, Veined and Shiny

Glassy or Pearly

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes

Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

Paving Stone, Office Buildings

Garden Decoration, Office Buildings

Other Architectural Uses

Curbing, Whetstones

Industry

Construction Industry

As Dimension Stone, Used for flooring, stair treads, borders and window sills.

As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement, Manufacture of Magnesium and Dolomite Refractories, Production of Glass and Ceramics, Serves as an Oil and Gas Reservoir rock

Medical Industry

Taken as a Supplement for Calcium or Magnesium

Antiquity Uses

Artifacts

Artifacts, Jewellery, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

As a touchstone, Cemetery Markers, Creating Artwork

An Oil and Gas Reservoir, As a Feed Additive for Livestock, Gemstone, Metallurgical Flux, Production of Lime, Soil Conditioner, Source of Magnesia (MgO)

Types

Algoma-type , Lake Superior-type, Superior-type and Taconite

Boninite and Jasperoid

Features

Is one of the oldest rock

Host Rock for Lead, Traps for subsurface fluids like Oil and Natural Gas., Zinc and Copper Deposits

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Present

Formation

The banded iron layers are formed in sea water when oxygen is released by photosynthetic cyano-bacteria. The oxygen then combines with dissolved iron in ocean to form insoluble iron oxides, which precipitated out, forming a thin layer of banded iron formation on ocean floor.

Dolomite rocks are originally deposited as calcite or aragonite rich limestone, but during diagenesis process, the calcite or aragonite is transformed into dolomite.

Composition

Mineral Content

Hematite, Magnetite, Quartz

Clay Minerals, Pyrite, Quartz, Sulfides

Compound Content

Fe, Iron(III) Oxide, Silicon Dioxide

NaCl, CaO, Carbon Dioxide, Magnesium Carbonate, MgO

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Chemical Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion, Wind Erosion

Properties

Physical Properties

Hardness

5.5-63.5-4

1 7

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Grain Size

Large and Coarse Grained

Medium to Fine Coarse Grained

Fracture

Uneven, Splintery or Conchoidal

Conchoidal

Streak

White

Porosity

Highly Porous

Less Porous

Luster

Earthy

Vitreous and Pearly

Compressive Strength

220.00 N/mm²140.00 N/mm²

0.15 450

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Cleavage

Perfect

Toughness

1.5

Specific Gravity

5.0-5.32.8-3

0 8.4

👆🏻

Transparency

Translucent to Opaque

Transparent to Translucent

Density

-9999 g/cm³2.8-2.9 g/cm³

0 1400

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Thermal Properties

Specific Heat Capacity

3.20 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Iran, Iraq, Oman, Russia, Saudi Arabia, Taiwan, Thailand, Vietnam

China, India

Africa

Kenya, Morocco, South Africa, Tanzania

Morocco, Namibia

Europe

Austria, France, Greece, Italy, Malta, Poland, Portugal, Serbia, Spain, Sweden, United Kingdom

Austria, Italy, Romania, Spain, Switzerland

Others

Greenland, Mid-Atlantic Ridge

Deposits in Western Continents

North America

Canada, Mexico, USA

Mexico, USA

South America

Bolivia, Brazil

Brazil, Colombia

Deposits in Oceania Continent

Australia

New South Wales, Queensland, South Australia, Western Australia

New South Wales, Queensland, Yorke Peninsula

All about Banded iron formation and Dolomite Properties

Know all about Banded iron formation and Dolomite properties here. All properties of rocks are important as they define the type of rock and its application. Banded iron formation and Dolomite belong to Sedimentary Rocks.Texture of Banded iron formation is Banded, Trellis whereas that of Dolomite is Earthy. Banded iron formation appears Layered, Banded, Veined and Shiny and Dolomite appears Glassy or Pearly. The luster of Banded iron formation is earthy while that of Dolomite is vitreous and pearly. Banded iron formation is available in red, reddish brown colors whereas Dolomite is available in black, brown, green, grey, pink, white colors. The commercial uses of Banded iron formation are as a touchstone, cemetery markers, creating artwork and that of Dolomite are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo).