Andesite

Pseudotachylite

Andesite and Pseudotachylite

Andesite

Pseudotachylite

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Definition

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

Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.

History

Origin

North America

USA

Discoverer

Theodor von Gümbel

Unknown

Etymology

From Andes mountains, where it is found in abundance

From pseudo- +‎ tachylite, a glassy rock generated by frictional heat within faults.

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Quench

Color

Bluish - Grey, Grey, Pink, Yellow

Black, Brown, Green, Grey, Pink, White

Maintenance

Less

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

Decorative Aggregates, Entryways, Interior Decoration

Exterior Uses

Office Buildings, Roof Tiles

As Building Stone, As Facing Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

Cobblestones, Construction Aggregate, for Road Aggregate

As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Monuments

Other Uses

Commercial Uses

Commemorative Tablets, Creating Artwork

Creating Artwork, Gemstone

Types

Icelandite

Cataclastic rock

Features

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

Host Rock for Lead

Archaeological Significance

Monuments

Famous Monuments

Middle of the Earth in Ecuador

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.

Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Pseudotachylite is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.

Composition

Mineral Content

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

Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides

Compound Content

Silicon Dioxide

Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

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

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical 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

Fracture

Uneven

Streak

White

Light to dark brown

Porosity

Less Porous

Luster

Vitreous

Compressive Strength

225.00 N/mm²60.00 N/mm²

0.15 450

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Cleavage

Toughness

1.1

Specific Gravity

2.5-2.82.46-2.86

0 8.4

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Transparency

Opaque

Transparent to Translucent

Density

2.11-2.36 g/cm³2.7-2.9 g/cm³

0 1400

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Thermal Properties

Specific Heat Capacity

2.39 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

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Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Indonesia, Japan, Nepal, South Korea

South Korea

Africa

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

Western Africa

Europe

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

Great Britain, Switzerland

Others

Deposits in Western Continents

North America

Mexico, USA

South America

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

Deposits in Oceania Continent

Australia

New South Wales, New Zealand, Western Australia

Central Australia, Western Australia

All about Andesite and Pseudotachylite Properties

Know all about Andesite and Pseudotachylite properties here. All properties of rocks are important as they define the type of rock and its application. Andesite belongs to Igneous Rocks while Pseudotachylite belongs to Metamorphic Rocks.Texture of Andesite is Aphanitic to Porphyritic whereas that of Pseudotachylite is Quench. Andesite appears Dull and Soft and Pseudotachylite appears Dull and Soft. The luster of Andesite and Pseudotachylite is vitreous. Andesite is available in bluish - grey, grey, pink, yellow colors whereas Pseudotachylite is available in black, brown, green, grey, pink, white colors. The commercial uses of Andesite are commemorative tablets, creating artwork and that of Pseudotachylite are creating artwork, gemstone.