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Pseudotachylite and Gritstone


Gritstone and Pseudotachylite


Definition

Definition
Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.   
Gritstone or grit is a hard, coarse-grained, siliceous sandstone   

History
  
  

Origin
USA   
Pennines, England   

Discoverer
Unknown   
J.J. Ferber   

Etymology
From pseudo- +‎ tachylite, a glassy rock generated by frictional heat within faults.   
From Grit + Stone   

Class
Metamorphic Rocks   
Sedimentary Rocks   

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

Family
  
  

Group
Not Applicable   
Not Applicable   

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

Texture

Texture
Quench   
Earthy   

Color
Black, Brown, Colourless, Green, Grey, Pink, White   
Beige, Black, Brown, Colourless, Cream, Dark Brown, Green, Grey, Light Green, Light to Dark Grey, Pink, Red, White, Yellow   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
No   
Yes   

Wind Resistant
Yes   
Yes   

Acid Resistant
Yes   
No   

Appearance
Dull and Soft   
Layered and Foliated   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement   
Construction Aggregate, Roadstone   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Monuments   
Artifacts, Monuments, Sculpture   

Other Uses
  
  

Commercial Uses
Creating Artwork, Gemstone   
An Oil and Gas Reservoir, As a Feed Additive for Livestock, Gemstone, Metallurgical Flux, Production of Lime, Soil Conditioner, Source of Magnesia (MgO), Tombstones   

Types

Types
Not Available   
Not Available   

Features
Host Rock for Lead   
Available in Lots of Colors and Patterns, Generally rough to touch, Very fine grained rock   

Archaeological Significance
  
  

Monuments
Used   
Used   

Famous Monuments
Data Not Available   
Data Not Available   

Sculpture
Not Yet Used   
Used   

Famous Sculptures
Not Applicable   
Data Not Available   

Pictographs
Not Used   
Not Used   

Petroglyphs
Not Used   
Not Used   

Figurines
Not Yet Used   
Used   

Fossils
Absent   
Present   

Formation

Formation
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Pseudotachylite is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.   
Gritstone is a type of sedimentary rock which was formed on the floors of wide river deltas where the grit deposits were laid down, with every tide or flood dumping another layer of sediment.   

Composition
  
  

Mineral Content
Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides   
Calcite, Clay Minerals, Feldspar, Micas, Quartz   

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

Transformation
  
  

Metamorphism
Yes   
No   

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

Weathering
No   
Yes   

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

Erosion
No   
Yes   

Types of Erosion
Not Applicable   
Chemical Erosion, Coastal Erosion   

Properties

Physical Properties
  
  

Hardness
7   
6-7   

Grain Size
Very fine-grained   
Coarse Grained   

Fracture
Uneven   
Conchoidal   

Streak
Light to dark brown   
White   

Porosity
Less Porous   
Highly Porous   

Luster
Vitreous   
Dull   

Compressive Strength
60.00 N/mm2   
25
70.00 N/mm2   
24

Cleavage
Irregular   
Perfect   

Toughness
Not Available   
Not Available   

Specific Gravity
2.46-2.86   
2.250   

Transparency
Transparent to Translucent   
Opaque   

Density
2.7-2.9 g/cm3   
2.2 g/cm3   

Thermal Properties
  
  

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

Resistance
Heat Resistant   
Heat Resistant, Impact Resistant, Pressure Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
South Korea   
China, India, Kazakhstan, Mongolia, Russia, Uzbekistan   

Africa
Western Africa   
Namibia, Nigeria, South Africa   

Europe
Great Britain, Switzerland   
Austria, Denmark, Germany, Great Britain, Netherlands, Poland, Sweden, Switzerland, United Kingdom   

Others
Not Yet Found   
Greenland   

Deposits in Western Continents
  
  

North America
Not Yet Found   
Canada, USA   

South America
Not Yet Found   
Brazil   

Deposits in Oceania Continent
  
  

Australia
Central Australia, Western Australia   
New South Wales, New Zealand, Western Australia   

Summary >>
<< Reserves

All about Pseudotachylite and Gritstone Properties

Know all about Pseudotachylite and Gritstone properties here. All properties of rocks are important as they define the type of rock and its application. Pseudotachylite belongs to Metamorphic Rocks while Gritstone belongs to Sedimentary Rocks.Texture of Pseudotachylite is Quench whereas that of Gritstone is Earthy. Pseudotachylite appears Dull and Soft and Gritstone appears Layered and Foliated. The luster of Pseudotachylite is vitreous while that of Gritstone is dull. Pseudotachylite is available in black, brown, colourless, green, grey, pink, white colors whereas Gritstone is available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors. The commercial uses of Pseudotachylite are creating artwork, gemstone and that of Gritstone are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo), tombstones.

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