Home
Compare Rocks


Tephrite and Mylonite


Mylonite and Tephrite


Definition

Definition
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock   
Mylonite is a metamorphic rock formed by ductile deformation during intense shearing encountered during folding and faulting, a process termed cataclastic or dynamic metamorphism   

History
  
  

Origin
Germany   
New Zealand   

Discoverer
Van Tooren   
Unknown   

Etymology
From Greek tephra, ashes from Indo-European base, to burn   
From Greek mulōn mill + -ite   

Class
Igneous Rocks   
Metamorphic Rocks   

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

Family
  
  

Group
Volcanic   
Not Applicable   

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

Texture

Texture
Aphanitic to Porphyritic   
Foliated   

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

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
No   
No   

Wind Resistant
Yes   
No   

Acid Resistant
No   
No   

Appearance
Vesicular   
Dull, Banded and Foilated   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
Landscaping   
for Road Aggregate, Landscaping, Roadstone   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Sculpture   
Artifacts, Monuments   

Other Uses
  
  

Commercial Uses
Production of Lime, Soil Conditioner   
Creating Artwork, Gemstone, Jewelry   

Types

Types
Not Available   
Blastomylonites, Ultramylonites and Phyllonites   

Features
Host Rock for Lead   
Surfaces are often shiny   

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
Not Used   
Used   

Petroglyphs
Not Used   
Used   

Figurines
Used   
Used   

Fossils
Absent   
Absent   

Formation

Formation
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.   
Mylonites are ductilely deformed rocks formed by the accumulation of large shear strain, in ductile fault zones.   

Composition
  
  

Mineral Content
Alkali feldspar, Nepheline, Plagioclase, Pyroxene   
Porphyroblasts   

Compound Content
CaO, Carbon Dioxide, MgO, Silicon Dioxide   
Aluminium Oxide, Calcium Sulfate, Chromium(III) Oxide, Iron(III) Oxide, Magnesium Carbonate, Silicon Dioxide   

Transformation
  
  

Metamorphism
Yes   
No   

Types of Metamorphism
Cataclastic Metamorphism, Contact Metamorphism, Impact 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, Glacier Erosion, Sea Erosion, Water Erosion   
Chemical Erosion, Sea Erosion, Wind Erosion   

Properties

Physical Properties
  
  

Hardness
6.5   
3-4   

Grain Size
Medium to Fine Coarse Grained   
Fine Grained   

Fracture
Uneven   
Conchoidal   

Streak
Bluish Black   
White   

Porosity
Very Less Porous   
Highly Porous   

Luster
Subvitreous to Dull   
Shiny   

Compressive Strength
90.00 N/mm2   
22
1.28 N/mm2   
32

Cleavage
Crenulation and Pervasive   
Conchoidal   

Toughness
2.4   
Not Available   

Specific Gravity
2.86   
2.97-3.05   

Transparency
Opaque   
Opaque   

Density
2.8-2.9 g/cm3   
2.6-4.8 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
0.92 kJ/Kg K   
10
1.50 kJ/Kg K   
3

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

Reserves

Deposits in Eastern Continents
  
  

Asia
Not Yet Found   
China, India, Indonesia, Saudi Arabia, South Korea   

Africa
Namibia, Uganda   
Eritrea, Ethiopia, Ghana, South Africa, Western Africa   

Europe
Germany, Hungary, Italy, Portugal, Spain   
England, Finland, France, Germany, Great Britain, Greece, United Kingdom   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
USA   
USA   

South America
Not Yet Found   
Not Yet Found   

Deposits in Oceania Continent
  
  

Australia
New Zealand, Western Australia   
Central Australia, Western Australia   

Summary >>
<< Reserves

All about Tephrite and Mylonite Properties

Know all about Tephrite and Mylonite properties here. All properties of rocks are important as they define the type of rock and its application. Tephrite belongs to Igneous Rocks while Mylonite belongs to Metamorphic Rocks.Texture of Tephrite is Aphanitic to Porphyritic whereas that of Mylonite is Foliated. Tephrite appears Vesicular and Mylonite appears Dull, Banded and Foilated. The luster of Tephrite is subvitreous to dull while that of Mylonite is shiny. Tephrite is available in black, brown, colourless, green, grey, white colors whereas Mylonite is available in black to grey colors. The commercial uses of Tephrite are production of lime, soil conditioner and that of Mylonite are creating artwork, gemstone, jewelry.

Compare Igneous Rocks

Igneous Rocks

Igneous Rocks

» More Igneous Rocks

Compare Igneous Rocks

» More Compare Igneous Rocks