Tuff and Andesite

Tuff

Andesite

Andesite and Tuff

Definition

Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption

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

History

Origin

Italy

North America

Discoverer

Unknown

Theodor von Gümbel

Etymology

From a Latin word tophous then in Italian tufo and finally tuff

From Andes mountains, where it is found in abundance

Class

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Clastic, Pyroclastic

Aphanitic to Porphyritic

Color

Brown, Grey, Yellow

Bluish - Grey, Grey, Pink, Yellow

Maintenance

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Yes

Stain Resistant

Yes

Wind Resistant

Acid Resistant

Yes

Appearance

Dull, Vesicular and Foilated

Dull and Soft

Uses

Architecture

Interior Uses

Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration

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

Exterior Uses

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

Office Buildings, Roof Tiles

Other Architectural Uses

Curbing

Industry

Construction Industry

Building houses or walls, Construction Aggregate

Cobblestones, Construction Aggregate, for Road Aggregate

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Creating Artwork

Commemorative Tablets, Creating Artwork

Types

Welded tuff, Rhyolitic tuff, Basaltic tuff, Trachyte tuff, Andesitic tuff and Ignimbrite.

Icelandite

Features

Always found as volcanic pipes over deep continental crust

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

Archaeological Significance

Monuments

Famous Monuments

Easter Island in the Polynesian Triangle, Pacific Ocean

Middle of the Earth in Ecuador

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Tuff is formed when large masses of ash and sand which are mixed with hot gases are ejected by a volcano and avalanche rapidly down its slopes.

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

Composition

Mineral Content

Calcite, Chlorite

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

Compound Content

Hydrogen Sulfide, Sulfur Dioxide

Silicon Dioxide

Transformation

Metamorphism

Yes

Types of Metamorphism

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

Weathering

Yes

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

Yes

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

Properties

Physical Properties

Hardness

4-6

Grain Size

Fine Grained

Very fine-grained

Fracture

Uneven

Streak

White

Porosity

Highly Porous

Less Porous

Luster

Vitreous to Dull

Vitreous

Compressive Strength

243.80 N/mm²

225.00 N/mm²

Cleavage

Toughness

1.1

Specific Gravity

2.73

2.5-2.8

Transparency

Opaque

Density

1-1.8 g/cm³

2.11-2.36 g/cm³

Thermal Properties

Specific Heat Capacity

0.20 kJ/Kg K

2.39 kJ/Kg K

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Afghanistan, Armenia, Azerbaijan, Burma, Cambodia, China, India, Indonesia, Iran, Japan, Malaysia, Mongolia, Nepal, North Korea, Pakistan, Saudi Arabia, Syria, Taiwan, Thailand, Turkey, Vietnam, Yemen

India, Indonesia, Japan, Nepal, South Korea

Africa

Cameroon, Cape Verde, Eritrea, Ethiopia, Kenya, Libya, Madagascar, Nigeria, Rwanda, South Africa, Sudan, Uganda

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

Europe

France, Georgia, Germany, Greece, Iceland, Italy, Netherlands, Poland, Portugal, Spain, United Kingdom

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

Others

Antarctica, Hawaii Islands

Deposits in Western Continents

North America

Canada, Costa Rica, Panama, USA

Mexico, USA

South America

Argentina, Bolivia, Brazil, Chile, Ecuador, Paraguay

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

Deposits in Oceania Continent

Australia

Central Australia, Western Australia

New South Wales, New Zealand, Western Australia

Summary >>

<< Reserves

All about Tuff and Andesite Properties

Know all about Tuff and Andesite properties here. All properties of rocks are important as they define the type of rock and its application. Tuff and Andesite belong to Igneous Rocks.Texture of Tuff is Clastic, Pyroclastic whereas that of Andesite is Aphanitic to Porphyritic. Tuff appears Dull, Vesicular and Foilated and Andesite appears Dull and Soft. The luster of Tuff is vitreous to dull while that of Andesite is vitreous. Tuff is available in brown, grey, yellow colors whereas Andesite is available in bluish - grey, grey, pink, yellow colors. The commercial uses of Tuff are creating artwork and that of Andesite are commemorative tablets, creating artwork.

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