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Trachyandesite and Skarn


Skarn and Trachyandesite


Definition

Definition
Trachyandesite is an extrusive igneous rock.   
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
Indonesia   
USA, Australia   

Discoverer
Unknown   
Tornebohm   

Etymology
From French trachyandésite, trachy + andésite andesite, a lava intermediate in composition between trachyte and andesite   
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
Glassy, Massive, Porphyritic, Scoriaceous, Vesicular   
Earthy, Mud-rich, Rough   

Color
Black, Brown, Light to Dark Grey   
Black, Brown, Colourless, Green, Grey, White   

Maintenance
Less   
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 and Soft   
Dull   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
Building houses or walls, Cobblestones, for Road Aggregate, Rail Track Ballast, Roadstone   
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, Sculpture   
Artifacts, Monuments, Sculpture   

Other Uses
  
  

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

Types

Types
Basaltic Trachyandesite   
Endoskarns   

Features
Has High structural resistance against erosion and climate, Very fine grained rock   
Host Rock for Lead, Zinc and Copper Deposits   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Used   

Famous Monuments
Not Applicable   
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
Trachyandesite is a fine-grained, hard rock which is a type of metasomatite, essentially altered basalt. It forms with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.   
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
Alkali feldspar, Biotite, Olivine, Plagioclase, Pyroxene, Sodic plagioclase   
Calcite, Enstatite, Epidote, Garnet, Magnetite, Pyroxene, Titanite   

Compound Content
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide   
Au, CaO, Carbon Dioxide, Cu, Fe, MgO   

Transformation
  
  

Metamorphism
Yes   
Yes   

Types of Metamorphism
Cataclastic Metamorphism, Contact 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, Water Erosion, Wind Erosion   
Not Applicable   

Properties

Physical Properties
  
  

Hardness
4-5   
6.5   

Grain Size
Fine Grained   
Fine Grained   

Fracture
Conchoidal   
Irregular   

Streak
Light to dark brown   
Light to dark brown   

Porosity
Less Porous   
Less Porous   

Luster
Earthy   
Waxy and Dull   

Compressive Strength
37.40 N/mm2   
28
Not Available   

Cleavage
Perfect   
Slaty   

Toughness
2.3   
2.4   

Specific Gravity
2.8-3   
2.86   

Transparency
Opaque   
Opaque   

Density
2.9-3.1 g/cm3   
2.8-2.9 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
0.84 kJ/Kg K   
15
0.92 kJ/Kg K   
10

Resistance
Heat Resistant, Pressure Resistant, Wear Resistant   
Heat Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
India, Russia   
China, India, Russia, Saudi Arabia, South Korea, Sri Lanka   

Africa
South Africa   
South Africa, Western Africa   

Europe
Iceland   
United Kingdom   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
Canada   

South America
Brazil   
Brazil, Colombia, Paraguay   

Deposits in Oceania Continent
  
  

Australia
Not Yet Found   
Central Australia, Western Australia   

Summary >>
<< Reserves

All about Trachyandesite and Skarn Properties

Know all about Trachyandesite and Skarn properties here. All properties of rocks are important as they define the type of rock and its application. Trachyandesite belongs to Igneous Rocks while Skarn belongs to Metamorphic Rocks.Texture of Trachyandesite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Skarn is Earthy, Mud-rich, Rough. Trachyandesite appears Dull and Soft and Skarn appears Dull. The luster of Trachyandesite is earthy while that of Skarn is waxy and dull. Trachyandesite is available in black, brown, light to dark grey colors whereas Skarn is available in black, brown, colourless, green, grey, white colors. The commercial uses of Trachyandesite are creating artwork, pottery and that of Skarn are creating artwork, gemstone, jewelry, metallurgical flux, source of magnesia (mgo).

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