Banded iron formation

Flint

Banded iron formation and Flint

Banded iron formation

Flint

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Definition

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

Flint is a hard type of sedimentary rock that produces a small piece of burning material when hit by steel

History

Origin

Western Australia, Minnesota

Discoverer

Johann Gottlob Lehmann

Unknown

Etymology

From its formation process

From Old English flint - a type of rock mainly known for high hardness and for giving off sparks when struck

Class

Sedimentary Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Hard Rock

Family

Group

Other Categories

Coarse Grained Rock, Opaque Rock

Fine Grained Rock, Opaque Rock

Texture

Banded, Trellis

Banded, Rough

Color

Red, Reddish Brown

Black, Brown, Green, Grey, Red, 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

As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone

Other Architectural Uses

Curbing, Whetstones

Curbing

Industry

Construction Industry

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

Arrowheads, Cutting Tool, Spear Points

Medical Industry

Antiquity Uses

Artifacts

Other Uses

Commercial Uses

As a touchstone, Cemetery Markers, Creating Artwork

Creating Artwork, Gemstone, In fire-starting tools, Manufacture of tools, Metallurgical Flux, Jewelry, To ignite fire, Used in flintlock firearms

Types

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

Chert and Jasper

Features

Is one of the oldest rock

Clasts are smooth to touch, Easily splits into thin plates, Has High structural resistance against erosion and climate

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.

Flint is formed by the decomposition and compaction of various organisms such as sponges and diatoms under the water.

Composition

Mineral Content

Hematite, Magnetite, Quartz

Silicon

Compound Content

Fe, Iron(III) Oxide, Silicon Dioxide

Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Weathering

✔ ✘

Types of Weathering

Chemical Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion, Wind Erosion

Chemical Erosion, Coastal Erosion, Water Erosion

Properties

Physical Properties

Hardness

5.5-67

1 7

👆🏻

Grain Size

Large and Coarse Grained

Very fine-grained

Fracture

Uneven, Splintery or Conchoidal

Conchoidal

Streak

White

Porosity

Highly Porous

Luster

Earthy

Vitreous

Compressive Strength

220.00 N/mm²450.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

1.5

Specific Gravity

5.0-5.32.5-2.8

0 8.4

👆🏻

Transparency

Translucent to Opaque

Density

-9999 g/cm³2.7-2.71 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

3.20 kJ/Kg K0.74 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

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

Azerbaijan, China, Russia

Africa

Kenya, Morocco, South Africa, Tanzania

Europe

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

Austria, Belgium, Cyprus, Denmark, France, Germany, Italy, Malta, Netherlands, Poland, Portugal, Romania, Spain, Sweden, Switzerland, Turkey, Ukraine, United Kingdom

Others

Greenland, Mid-Atlantic Ridge

Deposits in Western Continents

North America

Canada, Mexico, USA

USA

South America

Bolivia, Brazil

Bolivia

Deposits in Oceania Continent

Australia

New South Wales, Queensland, South Australia, Western Australia

New Zealand, South Australia

All about Banded iron formation and Flint Properties

Know all about Banded iron formation and Flint properties here. All properties of rocks are important as they define the type of rock and its application. Banded iron formation and Flint belong to Sedimentary Rocks.Texture of Banded iron formation is Banded, Trellis whereas that of Flint is Banded, Rough. Banded iron formation appears Layered, Banded, Veined and Shiny and Flint appears Glassy or Pearly. The luster of Banded iron formation is earthy while that of Flint is vitreous. Banded iron formation is available in red, reddish brown colors whereas Flint is available in black, brown, green, grey, red, white colors. The commercial uses of Banded iron formation are as a touchstone, cemetery markers, creating artwork and that of Flint are creating artwork, gemstone, in fire-starting tools, manufacture of tools, metallurgical flux, jewelry, to ignite fire, used in flintlock firearms.