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Tuff Rock

Rocks with Medium Hardness

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Tuff Definition

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

History of Tuff

Origin
Italy
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Discoverer
Unknown

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

Class
Igneous Rocks
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Sub-Class
Durable Rock, Medium Hardness Rock
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Tuff Family

Group
Volcanic

Other Categories
Fine Grained Rock, Opaque Rock

Tuff Texture

Texture
Clastic, Pyroclastic
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Tuff Color
Brown, Grey, Yellow

Maintenance
More
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Durability
Durable

Water Resistant
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Scratch Resistant
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Stain Resistant
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Wind Resistant
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Acid Resistant
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Appearance
Dull, Vesicular and Foilated
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Tuff Uses

Architecture

Interior Uses
Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration
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Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
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Other Architectural Uses
Curbing

Industry

Construction Industry
Building houses or walls, Construction Aggregate

Medical Industry
Not Yet Used

Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines
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Other Uses

Commercial Uses
Creating Artwork
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Tuff Types

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

Features
Always found as volcanic pipes over deep continental crust
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Archaeological Significance of Tuff

Monuments
Used

Famous Monuments
Easter Island in the Polynesian Triangle, Pacific Ocean

Sculpture
Used

Famous Sculptures
Data Not Available

Pictographs
Used

Petroglyphs
Used

Figurines
Used

Fossils
Absent

Formation of Tuff

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.

Composition

Mineral Content
Calcite, Chlorite
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Compound Content
Hydrogen Sulfide, Sulfur Dioxide
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Transformation

Metamorphism

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

Weathering

Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

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

Properties of Tuff

Physical Properties of Tuff

Hardness
4-6

Grain Size
Fine Grained
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Fracture
Uneven
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Streak
White
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Porosity
Highly Porous
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Luster
Vitreous to Dull
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Compressive Strength
243.80 N/mm2
6
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Cleavage
Not Available
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Toughness
Not Available

Specific Gravity
2.73

Transparency
Opaque
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Density
1-1.8 g/cm3

Thermal Properties of Tuff

Specific Heat Capacity
0.20 kJ/Kg K
25
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Resistance
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
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Tuff Reserves

Tuff 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

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

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

Others
Antarctica, Hawaii Islands

Tuff Deposits in Western Continents

North America
Canada, Costa Rica, Panama, USA

South America
Argentina, Bolivia, Brazil, Chile, Ecuador, Paraguay

Tuff Deposits in Oceania Continent

Australia
Central Australia, Western Australia

Information about Tuff

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 Tuff Uses. We have provided you with all information about Tuff rock here. Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Tuff is available in brown, grey, yellow colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Tuff is white. Get to know more about Tuff rock and characteristics of Tuff rock in the next sections.

Characteristics of Tuff

Many rocks have distinct characteristics. Some of the Properties of Tuff are hardness, structure, streak, fracture etc. Tuff is significant as it is composed of minerals and has variety of uses in our day to day life. The characteristics of Tuff plays an important role in its identification. The hardness of Tuff is 4-6 on Moh’s hardness scale. Rocks according to their hardness are divided into:Hard Rocks, Soft Rocks and Rocks with Medium Hardness. Fracture of Tuff rock is uneven. Its specific heat capacity is 0.20 kJ/Kg K. Tuff is heat resistant, impact resistant, pressure resistant, wear resistant. Some of its uses are:

  • Interior Uses: Decorative aggregates, Entryways, Flooring, Homes and Interior decoration.
  • Construction Industry: Building houses or walls, Construction aggregate.

Know more about Tuff rock in the next section.

More About Tuff

Tuff is a type of Igneous Rocks. The color of rock is one of its important property. Tuff rock is available in brown, grey, yellow colors. It is Dull, Vesicular and Foilated in appearance. The Tuff mineral content includes Calcite, Chlorite. Its compound content includes Hydrogen Sulfide, Sulfur Dioxide. Let’s move on to the types of Tuff. The types of Tuff include Welded tuff, Rhyolitic tuff, Basaltic tuff, Trachyte tuff, Andesitic tuff and Ignimbrite.. Fossils are the remains of prehistoric plants or animals which are embedded in rock and preserved in petrified form. Fossils are found only in sedimentary rocks. As Tuff belongs to Igneous Rocks, fossils are not found in it.