Banded iron formation

Comendite

Banded iron formation and Comendite

Banded iron formation

Comendite

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Definition

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

Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite

History

Origin

Western Australia, Minnesota

Italy

Discoverer

Johann Gottlob Lehmann

Unknown

Etymology

From its formation process

Comendite derives its name from the area of Le Commende on San Pietro Island in Italy

Class

Sedimentary Rocks

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Coarse Grained Rock, Opaque Rock

Medium Grained Rock, Opaque Rock

Texture

Banded, Trellis

Porphyritic

Color

Red, Reddish Brown

Blue, Bluish - Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Layered, Banded, Veined and Shiny

Foliated

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes

Countertops, Decorative Aggregates, Interior Decoration

Exterior Uses

Paving Stone, Office Buildings

As Building Stone, As Facing Stone, Garden Decoration

Other Architectural Uses

Curbing, Whetstones

Curbing

Industry

Construction Industry

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

Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Raw material for the manufacture of mortar

Medical Industry

Antiquity Uses

Artifacts

Other Uses

Commercial Uses

As a touchstone, Cemetery Markers, Creating Artwork

Cemetery Markers

Types

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

Rhyolite

Features

Is one of the oldest rock

Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Present

Absent

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.

Comendite is a type of Igneous rock which is formed due to cooling and solidification of lava or magma. It may form with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.

Composition

Mineral Content

Hematite, Magnetite, Quartz

Albite, Amphibole, Quartz

Compound Content

Fe, Iron(III) Oxide, Silicon Dioxide

Al, Fe, Potassium Oxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Chemical Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion, Wind Erosion

Coastal Erosion, Water Erosion

Properties

Physical Properties

Hardness

5.5-66-7

1 7

👆🏻

Grain Size

Large and Coarse Grained

Medium Grained

Fracture

Uneven, Splintery or Conchoidal

Pervasive

Streak

White

Bluish Black

Porosity

Highly Porous

Luster

Earthy

Dull

Compressive Strength

220.00 N/mm²92.40 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

1.5

Specific Gravity

5.0-5.32.38

0 8.4

👆🏻

Transparency

Translucent to Opaque

Opaque

Density

-9999 g/cm³-9999 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

3.20 kJ/Kg K0.79 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

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

China

Africa

Kenya, Morocco, South Africa, Tanzania

East Africa

Europe

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

Italy

Others

Greenland, Mid-Atlantic Ridge

Deposits in Western Continents

North America

Canada, Mexico, USA

South America

Bolivia, Brazil

Deposits in Oceania Continent

Australia

New South Wales, Queensland, South Australia, Western Australia

Queensland

All about Banded iron formation and Comendite Properties

Know all about Banded iron formation and Comendite properties here. All properties of rocks are important as they define the type of rock and its application. Banded iron formation belongs to Sedimentary Rocks while Comendite belongs to Igneous Rocks.Texture of Banded iron formation is Banded, Trellis whereas that of Comendite is Porphyritic. Banded iron formation appears Layered, Banded, Veined and Shiny and Comendite appears Foliated. The luster of Banded iron formation is earthy while that of Comendite is dull. Banded iron formation is available in red, reddish brown colors whereas Comendite is available in blue, bluish - grey colors. The commercial uses of Banded iron formation and Comendite are as a touchstone, cemetery markers, creating artwork.