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Basalt Rock



Definition

Definition
Basalt is a common extrusive igneous rock formed by the rapid cooling of basaltic lava exposed at or very near the surface of Earth

History

Origin
Egypt

Discoverer
Georgius Agricola

Etymology
From Late Latin Basaltes (variant of basanites ), very hard stone, which was imported from Ancient Greek Basanites

Class
Igneous Rocks

Sub-Class
Durable Rock, Medium Hardness Rock

Family

Group
Volcanic

Other Categories
Fine Grained Rock, Opaque Rock

Texture

Texture
Glassy, Massive, Porphyritic, Scoriaceous, Vesicular

Color
Black, Brown, Light to Dark Grey

Maintenance
More

Durability
Durable

Water Resistant
No

Scratch Resistant
Yes

Stain Resistant
Yes

Wind Resistant
No

Acid Resistant
Yes

Appearance
Dull and Soft

Uses

Architecture

Interior Uses
Floor Tiles, Homes, Hotels, Kitchens

Exterior Uses
As Building Stone, Paving Stone, Garden Decoration, Office Buildings

Other Architectural Uses
Curbing, Whetstones

Industry

Construction Industry
Arrowheads, As Dimension Stone, Cobblestones, Cutting Tool, Rail Track Ballast, Roadstone

Medical Industry
-

Antiquity Uses
Artifacts, Monuments

Other Uses

Commercial Uses
An Oil and Gas Reservoir, Commemorative Tablets, Creating Artwork, Used in aquariums

Types

Types
Alkaline Basalt, Boninite, High Alumina Basalt, Mid Ocean Ridge Basalt (MORB), Tholeiitic Basalt, Basaltic trachyandesite, Mugearite and Shoshonite

Features
Has High structural resistance against erosion and climate, Very fine grained rock

Archaeological Significance

Monuments
-

Famous Monuments
Easter Island in the Polynesian Triangle, Pacific Ocean, Gateway of India in Mumbai, India, Gol Gumbaz in Karnataka, India

Sculpture
-

Famous Sculptures
-

Pictographs
-

Petroglyphs
-

Figurines
-

Fossils
Absent

Formation

Formation
Basalt forms when lava reaches the Earth's surface near an active volcano. The temperature of lava is between 1100 to 1250° C when it gets to the surface.

Composition

Mineral Content
Olivine, Plagioclase, Pyroxene

Compound Content
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide

Transformation

Metamorphism
Yes

Types of Metamorphism
Contact Metamorphism

Weathering
Yes

Types of Weathering
Biological Weathering

Erosion
No

Types of Erosion
-

Properties

Physical Properties

Hardness
6

Grain Size
Fine Grained

Fracture
Conchoidal

Streak
White to Grey

Porosity
Less Porous

Luster
-

Compressive Strength
37.40 N/mm2 42

Cleavage
-

Toughness
2.3

Specific Gravity
2.8-3

Transparency
Opaque

Density
2.9-3.1 g/cm3

Thermal Properties

Specific Heat Capacity
0.84 kJ/Kg K 15

Resistance
Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia
India, Russia

Africa
South Africa

Europe
Iceland

Others
-

Deposits in Western Continents

North America
Canada, USA

South America
Brazil

Deposits in Oceania Continent

Australia
-

Definition >>
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Igneous Rocks

Information about Basalt

Rocks are naturally occurring solids which are composed of minerals & have been used by humans since ages. From Stone Age, rocks are used for various purposes. Also, the metals and minerals found in rock play an important role in our life. Get to know all the Basalt Uses. We have provided you with all information about Basalt rock here. Basalt is a common extrusive igneous rock formed by the rapid cooling of basaltic lava exposed at or very near the surface of Earth. Basalt is available in black, brown, light to dark grey colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Basalt is white to grey. Get to know more about Basalt rock and characteristics of Basalt rock in the next sections.

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