Andesite

Basalt

Andesite and Basalt

Andesite

Basalt

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Definition

Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava

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

North America

Egypt

Discoverer

Theodor von Gümbel

Georgius Agricola

Etymology

From Andes mountains, where it is found in abundance

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

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Glassy, Massive, Porphyritic, Scoriaceous, Vesicular

Color

Bluish - Grey, Grey, Pink, Yellow

Black, Brown, Light to Dark Grey

Maintenance

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Soft

Uses

Architecture

Interior Uses

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration, Kitchens

Floor Tiles, Homes, Hotels, Kitchens

Exterior Uses

Office Buildings, Roof Tiles

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

Other Architectural Uses

Curbing

Curbing, Whetstones

Industry

Construction Industry

Cobblestones, Construction Aggregate, for Road Aggregate

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

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Monuments

Other Uses

Commercial Uses

Commemorative Tablets, Creating Artwork

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

Types

Icelandite

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

Features

Generally rough to touch, High silica content, Is one of the oldest rock

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

Archaeological Significance

Monuments

Famous Monuments

Middle of the Earth in Ecuador

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

Andesite is a fine-grained igneous rock that forms when the magma is erupted onto the surface and is crystallized quickly.

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

Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Ilmenite, Magnetite, Plagioclase, Pyroxene, Zircon

Olivine, Plagioclase, Pyroxene

Compound Content

Silicon Dioxide

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

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism

Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

Properties

Physical Properties

Hardness

1 7

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Grain Size

Very fine-grained

Fine Grained

Fracture

Uneven

Conchoidal

Streak

White

White to Grey

Porosity

Less Porous

Luster

Vitreous

Compressive Strength

225.00 N/mm²37.40 N/mm²

0.15 450

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Cleavage

Toughness

1.1

2.3

Specific Gravity

2.5-2.82.8-3

0 8.4

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Transparency

Opaque

Density

2.11-2.36 g/cm³2.9-3.1 g/cm³

0 1400

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Thermal Properties

Specific Heat Capacity

2.39 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

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Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Indonesia, Japan, Nepal, South Korea

India, Russia

Africa

Egypt, Ethiopia, Morocco, Namibia, South Africa, Tanzania

South Africa

Europe

Austria, Finland, Germany, Italy, Romania, Turkey, United Kingdom

Iceland

Others

Deposits in Western Continents

North America

Mexico, USA

Canada, USA

South America

Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela

Brazil

Deposits in Oceania Continent

Australia

New South Wales, New Zealand, Western Australia

All about Andesite and Basalt Properties

Know all about Andesite and Basalt properties here. All properties of rocks are important as they define the type of rock and its application. Andesite and Basalt belong to Igneous Rocks.Texture of Andesite is Aphanitic to Porphyritic whereas that of Basalt is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular. Andesite appears Dull and Soft and Basalt appears Dull and Soft. The luster of Andesite is vitreous while that of Basalt is . Andesite is available in bluish - grey, grey, pink, yellow colors whereas Basalt is available in black, brown, light to dark grey colors. The commercial uses of Andesite are commemorative tablets, creating artwork and that of Basalt are an oil and gas reservoir, commemorative tablets, creating artwork, used in aquariums.