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Tuff vs Skarn


Skarn vs Tuff


Definition

Definition
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption   
Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin   

History
  
  

Origin
Italy   
USA, Australia   

Discoverer
Unknown   
Tornebohm   

Etymology
From a Latin word tophous then in Italian tufo and finally tuff   
From an old Swedish mining term originally used to describe a type of silicate gangue or waste rock.   

Class
Igneous Rocks   
Metamorphic Rocks   

Sub-Class
Durable Rock, Medium Hardness Rock   
Durable Rock, Hard Rock   

Family
  
  

Group
Volcanic   
Not Applicable   

Other Categories
Fine Grained Rock, Opaque Rock   
Fine Grained Rock, Opaque Rock   

Texture

Texture
Clastic, Pyroclastic   
Earthy, Mud-rich, Rough   

Color
Brown, Grey, Yellow   
Black, Brown, Colourless, Green, Grey, White   

Maintenance
More   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
No   
No   

Wind Resistant
No   
Yes   

Acid Resistant
No   
Yes   

Appearance
Dull, Vesicular and Foilated   
Dull   

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration   
Decorative Aggregates, Entryways, Interior Decoration   

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
Building houses or walls, Construction Aggregate   
As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Gold and Silver production, Manufacture of Magnesium and Dolomite Refractories   

Medical Industry
Not Yet Used   
Not Applicable   

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

Other Uses
  
  

Commercial Uses
Creating Artwork   
Creating Artwork, Gemstone, Jewelry, Metallurgical Flux, Source of Magnesia (MgO)   

Types

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

Features
Always found as volcanic pipes over deep continental crust   
Host Rock for Lead, Zinc and Copper Deposits   

Archaeological Significance
  
  

Monuments
Used   
Used   

Famous Monuments
Easter Island in the Polynesian Triangle, Pacific Ocean   
Data Not Available   

Sculpture
Used   
Used   

Famous Sculptures
Data Not Available   
Data Not Available   

Pictographs
Used   
Not Used   

Petroglyphs
Used   
Not Used   

Figurines
Used   
Used   

Fossils
Absent   
Absent   

Formation

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

Composition
  
  

Mineral Content
Calcite, Chlorite   
Calcite, Enstatite, Epidote, Garnet, Magnetite, Pyroxene, Titanite   

Compound Content
Hydrogen Sulfide, Sulfur Dioxide   
Au, CaO, Carbon Dioxide, Cu, Fe, MgO   

Transformation
  
  

Metamorphism
Yes   
Yes   

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

Weathering
Yes   
No   

Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering   
Not Applicable   

Erosion
Yes   
No   

Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion   
Not Applicable   

Properties

Physical Properties
  
  

Hardness
4-6   
6.5   

Grain Size
Fine Grained   
Fine Grained   

Fracture
Uneven   
Irregular   

Streak
White   
Light to dark brown   

Porosity
Highly Porous   
Less Porous   

Luster
Vitreous to Dull   
Waxy and Dull   

Compressive Strength
243.80 N/mm2   
5
Not Available   

Cleavage
Not Available   
Slaty   

Toughness
Not Available   
2.4   

Specific Gravity
2.73   
2.86   

Transparency
Opaque   
Opaque   

Density
1-1.8 g/cm3   
2.8-2.9 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
0.20 kJ/Kg K   
25
0.92 kJ/Kg K   
10

Resistance
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant   
Heat 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   
China, India, Russia, Saudi Arabia, South Korea, Sri Lanka   

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

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

Others
Antarctica, Hawaii Islands   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, Costa Rica, Panama, USA   
Canada   

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

Deposits in Oceania Continent
  
  

Australia
Central Australia, Western Australia   
Central Australia, Western Australia   

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Tuff vs Skarn Information

Earth’s outer layer is covered by rocks and these rocks have different physical and chemical properties. As two rocks are not same, it’s fun to compare them. You can also know more about Tuff and Skarn Reserves. Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin. These rocks are composed of many distinct minerals. The process of formation of rocks is different for various rocks. Rocks are quarried from many years for various purposes. You can check out Tuff vs Skarn information and Tuff vs Skarn characteristics in the upcoming sections.

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Tuff vs Skarn Characteristics

Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Tuff vs Skarn characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Tuff and Properties of Skarn. Learn more about Tuff vs Skarn in the next section. The interior uses of Tuff include Decorative aggregates, Entryways, Flooring, Homes and Interior decoration whereas the interior uses of Skarn include Decorative aggregates, Entryways and Interior decoration. Due to some exceptional properties of Tuff and Skarn, they have various applications in construction industry. The uses of Tuff in construction industry include Building houses or walls, Construction aggregate and that of Skarn include As a flux in the production of steel and pig iron, As a sintering agent in steel industry to process iron ore, As dimension stone, Gold and silver production, Manufacture of magnesium and dolomite refractories.

More about Tuff and Skarn

Here you can know more about Tuff and Skarn. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Tuff and Skarn consists of mineral content and compound content. The mineral content of Tuff includes Calcite, Chlorite and mineral content of Skarn includes Calcite, Enstatite, Epidote, Garnet, Magnetite, Pyroxene, Titanite. You can also check out the list of all Igneous Rocks. When we have to compare Tuff vs Skarn, the texture, color and appearance plays an important role in determining the type of rock. Tuff is available in brown, grey, yellow colors whereas, Skarn is available in black, brown, colourless, green, grey, white colors. Appearance of Tuff is Dull, Vesicular and Foilated and that of Skarn is Dull. Properties of rock is another aspect for Tuff vs Skarn. The hardness of Tuff is 4-6 and that of Skarn is 6.5. The types of Tuff are Welded tuff, Rhyolitic tuff, Basaltic tuff, Trachyte tuff, Andesitic tuff and Ignimbrite. whereas types of Skarn are Endoskarns. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Tuff is white while that of Skarn is light to dark brown. The specific heat capacity of Tuff is 0.20 kJ/Kg K and that of Skarn is 0.92 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Tuff is heat resistant, impact resistant, pressure resistant, wear resistant whereas Skarn is heat resistant.

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