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Pseudotachylite and Gabbro


Gabbro and Pseudotachylite


Definition

Definition
Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.   
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt   

History
  
  

Origin
USA   
Germany   

Discoverer
Unknown   
Christian Leopold von Buch   

Etymology
From pseudo- +‎ tachylite, a glassy rock generated by frictional heat within faults.   
From Latin glaber bare, smooth, bald   

Class
Metamorphic Rocks   
Igneous Rocks   

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

Family
  
  

Group
Not Applicable   
Plutonic   

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

Texture

Texture
Quench   
Phaneritic   

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

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   
Yes   

Appearance
Dull and Soft   
Veined and Shiny   

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

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Monuments   
Artifacts, Monuments, Sculpture   

Other Uses
  
  

Commercial Uses
Creating Artwork, Gemstone   
Cemetery Markers, Commemorative Tablets, Laboratory bench tops, Jewelry, Sea Defence, Tombstones   

Types

Types
Not Available   
Not Available   

Features
Host Rock for Lead   
Smooth to touch   

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   
Absent   

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.   
Gabbro, a mafic rock, forms due to cooling and crystallization of magma underneath Earth's surface.   

Composition
  
  

Mineral Content
Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides   
Augite, Olivine, Plagioclase, Pyroxene   

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

Transformation
  
  

Metamorphism
Yes   
Yes   

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

Weathering
No   
Yes   

Types of Weathering
Not Applicable   
Chemical Weathering   

Erosion
No   
Yes   

Types of Erosion
Not Applicable   
Coastal Erosion   

Properties

Physical Properties
  
  

Hardness
7   
7   

Grain Size
Very fine-grained   
Coarse Grained   

Fracture
Uneven   
Conchoidal   

Streak
Light to dark brown   
Black   

Porosity
Less Porous   
Highly Porous   

Luster
Vitreous   
Not Available   

Compressive Strength
60.00 N/mm2   
25
225.00 N/mm2   
7

Cleavage
Irregular   
Not Available   

Toughness
Not Available   
1.6   

Specific Gravity
2.46-2.86   
2.86-2.87   

Transparency
Transparent to Translucent   
Opaque   

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

Thermal Properties
  
  

Specific Heat Capacity
0.92 kJ/Kg K   
10
Not Available   

Resistance
Heat Resistant   
Impact Resistant, Pressure Resistant, Wear Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
South Korea   
India, Russia   

Africa
Western Africa   
South Africa   

Europe
Great Britain, Switzerland   
Germany, Greece, Italy, Scotland, Turkey   

Others
Not Yet Found   
Greenland   

Deposits in Western Continents
  
  

North America
Not Yet Found   
Canada, USA   

South America
Not Yet Found   
Brazil, Colombia, Venezuela   

Deposits in Oceania Continent
  
  

Australia
Central Australia, Western Australia   
New Zealand, Queensland   

Summary >>
<< Reserves

All about Pseudotachylite and Gabbro Properties

Know all about Pseudotachylite and Gabbro properties here. All properties of rocks are important as they define the type of rock and its application. Pseudotachylite belongs to Metamorphic Rocks while Gabbro belongs to Igneous Rocks.Texture of Pseudotachylite is Quench whereas that of Gabbro is Phaneritic. Pseudotachylite appears Dull and Soft and Gabbro appears Veined and Shiny. The luster of Pseudotachylite is vitreous while that of Gabbro is not available. Pseudotachylite is available in black, brown, colourless, green, grey, pink, white colors whereas Gabbro is available in dark grey to black colors. The commercial uses of Pseudotachylite are creating artwork, gemstone and that of Gabbro are cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones.

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