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Trachyandesite and Metapelite


Metapelite and Trachyandesite


Definition

Definition
Trachyandesite is an extrusive igneous rock.   
Metapelite is an old and currently not widely used field geological term for a clay rich fine-grained clastic sediment or sedimentary rock, i.e. mud or a mudstone   

History
  
  

Origin
Indonesia   
Unknown   

Discoverer
Unknown   
Unknown   

Etymology
From French trachyandésite, trachy + andésite andesite, a lava intermediate in composition between trachyte and andesite   
From Pelos or clay in Greek   

Class
Igneous Rocks   
Metamorphic Rocks   

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

Family
  
  

Group
Volcanic   
Not Applicable   

Other Categories
Fine Grained Rock, Opaque Rock   
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock   

Texture

Texture
Glassy, Massive, Porphyritic, Scoriaceous, Vesicular   
Foliated   

Color
Black, Brown, Light to Dark Grey   
Dark Greenish - Grey, Green, Light Green, Light Greenish Grey   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
No   
Yes   

Wind Resistant
No   
No   

Acid Resistant
No   
No   

Appearance
Dull and Soft   
Banded   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
Building houses or walls, Cobblestones, for Road Aggregate, Rail Track Ballast, Roadstone   
Cement Manufacture, Construction Aggregate, for Road Aggregate   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Sculpture   
Artifacts   

Other Uses
  
  

Commercial Uses
Creating Artwork, Pottery   
Commemorative Tablets, Creating Artwork   

Types

Types
Basaltic Trachyandesite   
Not Available   

Features
Has High structural resistance against erosion and climate, Very fine grained rock   
Easily splits into thin plates, It is One of the Oldest, Strongest and Hardest Rock   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Not Yet Used   

Famous Monuments
Not Applicable   
Not Applicable   

Sculpture
Used   
Not Yet Used   

Famous Sculptures
Data Not Available   
Not Applicable   

Pictographs
Used   
Used   

Petroglyphs
Used   
Used   

Figurines
Used   
Not Yet 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. Metapelite 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   
Albite, Chlorite, Quartz   

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

Transformation
  
  

Metamorphism
Yes   
No   

Types of Metamorphism
Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism   
Not Applicable   

Weathering
Yes   
Yes   

Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering   
Biological Weathering, Chemical Weathering, Mechanical Weathering   

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
4-5   
5-6   

Grain Size
Fine Grained   
Medium to Fine Coarse Grained   

Fracture
Conchoidal   
Fibrous   

Streak
Light to dark brown   
Unknown   

Porosity
Less Porous   
Highly Porous   

Luster
Earthy   
Earthy   

Compressive Strength
37.40 N/mm2   
28
Not Available   

Cleavage
Perfect   
Not Available   

Toughness
2.3   
Not Available   

Specific Gravity
2.8-3   
3.4-3.7   

Transparency
Opaque   
Opaque   

Density
2.9-3.1 g/cm3   
0-300 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
0.84 kJ/Kg K   
15
0.72 kJ/Kg K   
20

Resistance
Heat Resistant, Pressure Resistant, Wear Resistant   
Heat Resistant, Impact Resistant, Pressure Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
India, Russia   
Not Yet Found   

Africa
South Africa   
Western Africa   

Europe
Iceland   
United Kingdom   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
Not Available   

South America
Brazil   
Brazil, Colombia, Ecuador   

Deposits in Oceania Continent
  
  

Australia
Not Yet Found   
Central Australia, Western Australia   

Summary >>
<< Reserves

All about Trachyandesite and Metapelite Properties

Know all about Trachyandesite and Metapelite properties here. All properties of rocks are important as they define the type of rock and its application. Trachyandesite belongs to Igneous Rocks while Metapelite belongs to Metamorphic Rocks.Texture of Trachyandesite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Metapelite is Foliated. Trachyandesite appears Dull and Soft and Metapelite appears Banded. The luster of Trachyandesite and Metapelite is earthy. Trachyandesite is available in black, brown, light to dark grey colors whereas Metapelite is available in dark greenish - grey, green, light green, light greenish grey colors. The commercial uses of Trachyandesite are creating artwork, pottery and that of Metapelite are commemorative tablets, creating artwork.

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