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Teschenite and Tephrite


Tephrite and Teschenite


Definition

Definition
Teschenite is coarse- to fine-grained, dark-coloured intrusive igneous rock that usually occurs in sills, dikes and irregular masses and is always altered to some extent   
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock   

History
  
  

Origin
Scotland   
Germany   

Discoverer
Unknown   
Van Tooren   

Etymology
From its occurrence near Teschen. now known as Cieszyn, Pol., Scotland   
From Greek tephra, ashes from Indo-European base, to burn   

Class
Igneous Rocks   
Igneous Rocks   

Sub-Class
Durable Rock, Hard Rock   
Durable Rock, Hard Rock   

Family
  
  

Group
Plutonic   
Volcanic   

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

Texture

Texture
Phaneritic   
Aphanitic to Porphyritic   

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

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
No   

Wind Resistant
Yes   
Yes   

Acid Resistant
Yes   
No   

Appearance
Veined and Shiny   
Vesicular   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate   
Landscaping   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Sculpture   
Artifacts, Sculpture   

Other Uses
  
  

Commercial Uses
Cemetery Markers, Commemorative Tablets, Creating Artwork, Laboratory bench tops, Jewelry, Sea Defence, Tombstones   
Production of Lime, Soil Conditioner   

Types

Types
Not Available   
Not Available   

Features
Smooth to touch   
Host Rock for Lead   

Archaeological Significance
  
  

Monuments
Used   
Not Yet Used   

Famous Monuments
Data Not Available   
Not Applicable   

Sculpture
Used   
Used   

Famous Sculptures
Data Not Available   
Data Not Available   

Pictographs
Not Used   
Not Used   

Petroglyphs
Not Used   
Not Used   

Figurines
Used   
Used   

Fossils
Absent   
Absent   

Formation

Formation
Teschenite 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.   
Tephrite 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.   

Composition
  
  

Mineral Content
Augite, Olivine, Plagioclase, Pyroxene   
Alkali feldspar, Nepheline, Plagioclase, Pyroxene   

Compound Content
Aluminium Oxide, CaO, Chromium(III) Oxide, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Sulfur Trioxide   
CaO, Carbon Dioxide, MgO, Silicon Dioxide   

Transformation
  
  

Metamorphism
Yes   
Yes   

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

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

Properties

Physical Properties
  
  

Hardness
7   
6.5   

Grain Size
Coarse Grained   
Medium to Fine Coarse Grained   

Fracture
Conchoidal   
Uneven   

Streak
Black   
Bluish Black   

Porosity
Highly Porous   
Very Less Porous   

Luster
Not Available   
Subvitreous to Dull   

Compressive Strength
225.00 N/mm2   
7
90.00 N/mm2   
22

Cleavage
Not Available   
Crenulation and Pervasive   

Toughness
1.6   
2.4   

Specific Gravity
2.86-2.87   
2.86   

Transparency
Opaque   
Opaque   

Density
2.7-3.3 g/cm3   
2.8-2.9 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
Not Available   
0.92 kJ/Kg K   
10

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

Reserves

Deposits in Eastern Continents
  
  

Asia
India, Russia   
Not Yet Found   

Africa
South Africa   
Namibia, Uganda   

Europe
Germany, Greece, Italy, Scotland, Turkey   
Germany, Hungary, Italy, Portugal, Spain   

Others
Greenland   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
USA   

South America
Brazil, Colombia, Venezuela   
Not Yet Found   

Deposits in Oceania Continent
  
  

Australia
New Zealand, Queensland   
New Zealand, Western Australia   

Summary >>
<< Reserves

All about Teschenite and Tephrite Properties

Know all about Teschenite and Tephrite properties here. All properties of rocks are important as they define the type of rock and its application. Teschenite and Tephrite belong to Igneous Rocks.Texture of Teschenite is Phaneritic whereas that of Tephrite is Aphanitic to Porphyritic. Teschenite appears Veined and Shiny and Tephrite appears Vesicular. The luster of Teschenite is not available while that of Tephrite is subvitreous to dull. Teschenite is available in dark grey to black colors whereas Tephrite is available in black, brown, colourless, green, grey, white colors. The commercial uses of Teschenite are cemetery markers, commemorative tablets, creating artwork, laboratory bench tops, jewelry, sea defence, tombstones and that of Tephrite are production of lime, soil conditioner.

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