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Pseudotachylite vs Gossan


Gossan vs Pseudotachylite


Definition

Definition
Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.  
Gossan is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein.  

History
  
  

Origin
USA  
Indonesia  

Discoverer
Unknown  
Cornish Gossen  

Etymology
From pseudo- +‎ tachylite, a glassy rock generated by frictional heat within faults.  
From Cornish gossen from gos, blood from Old Cornish guit  

Class
Metamorphic Rocks  
Metamorphic Rocks  

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

Family
  
  

Group
-  
-  

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

Texture

Texture
Quench  
Rough, Sandy  

Color
Black, Brown, Green, Grey, Pink, White  
Brown, Brown- Black, Gold, Green, Rust  

Maintenance
Less  
Less  

Durability
Durable  
Durable  

Water Resistant
Yes  
Yes  

Scratch Resistant
Yes  
Yes  

Stain Resistant
No  
Yes  

Wind Resistant
Yes  
No  

Acid Resistant
Yes  
No  

Appearance
Dull and Soft  
Dull and Banded  

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing  
Curbing  

Industry
  
  

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

Medical Industry
-  
-  

Antiquity Uses
Artifacts, Monuments  
Artifacts  

Other Uses
  
  

Commercial Uses
Creating Artwork, Gemstone  
Cemetery Markers, Commemorative Tablets, Gemstone  

Types

Types
Cataclastic rock  
Translocated gossan and Leakage gossan  

Features
Host Rock for Lead  
Clasts are smooth to touch, Easily splits into thin plates  

Archaeological Significance
  
  

Monuments
-  
-  

Famous Monuments
-  
-  

Sculpture
-  
-  

Famous Sculptures
-  
-  

Pictographs
-  
-  

Petroglyphs
-  
-  

Figurines
-  
-  

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.  
Earth movements can cause rocks to be either deeply buried or squeezed and hence the rocks are heated and put under great pressure.   

Composition
  
  

Mineral Content
Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides  
Apatite, Augite, Biotite, Bronzite, Calcite, Chert, Epidote, Feldspar, Hornblende, Micas, Plagioclase, Pyroxene, Quartz, Sulfides, Zircon  

Compound Content
Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur  
Aluminium Oxide, CaO, Fe, FeO, Silicon Dioxide, Sulphur  

Transformation
  
  

Metamorphism
Yes  
No  

Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism  
-  

Weathering
No  
No  

Types of Weathering
-  
-  

Erosion
No  
Yes  

Types of Erosion
-  
Chemical Erosion, Sea Erosion, Wind Erosion  

Properties

Physical Properties
  
  

Hardness
7  
4-5  

Grain Size
Very fine-grained  
Fine to Medium Grained  

Fracture
Uneven  
Conchoidal  

Streak
Light to dark brown  
White to Grey  

Porosity
Less Porous  
Highly Porous  

Luster
Vitreous  
Metallic  

Compressive Strength
60.00 N/mm2  
37
-  

Cleavage
-  
-  

Toughness
-  
-  

Specific Gravity
2.46-2.86  
2.0  

Transparency
Transparent to Translucent  
Opaque  

Density
2.7-2.9 g/cm3  
-9999 g/cm3  

Thermal Properties
  
  

Specific Heat Capacity
0.92 kJ/Kg K  
10
0.24 kJ/Kg K  
31

Resistance
Heat Resistant  
Heat Resistant, Impact Resistant, Pressure Resistant  

Reserves

Deposits in Eastern Continents
  
  

Asia
South Korea  
China, India, Indonesia, Russia, Singapore, South Korea  

Africa
Western Africa  
Cape Verde, Ethiopia, Ghana, South Africa, Western Africa  

Europe
Great Britain, Switzerland  
Albania, France, Germany, Great Britain, United Kingdom  

Others
-  
-  

Deposits in Western Continents
  
  

North America
-  
Canada, USA  

South America
-  
Brazil, Colombia, Ecuador  

Deposits in Oceania Continent
  
  

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

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Pseudotachylite vs Gossan Information

Earth’s outer layer is covered by rocks and these rocks have different physical and chemical properties. As two rocks are not same, it’s fun to compare them. You can also know more about Pseudotachylite and Gossan Reserves. Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.. Gossan is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein.. These rocks are composed of many distinct minerals. The process of formation of rocks is different for various rocks. Rocks are quarried from many years for various purposes. You can check out Pseudotachylite vs Gossan information and Pseudotachylite vs Gossan characteristics in the upcoming sections.

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Pseudotachylite vs Gossan Characteristics

Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Pseudotachylite vs Gossan characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Pseudotachylite and Properties of Gossan. Learn more about Pseudotachylite vs Gossan in the next section. The interior uses of Pseudotachylite include Decorative aggregates, Entryways and Interior decoration whereas the interior uses of Gossan include Countertops, Decorative aggregates and Interior decoration. Due to some exceptional properties of Pseudotachylite and Gossan, they have various applications in construction industry. The uses of Pseudotachylite in construction industry include As dimension stone, Cement manufacture, For road aggregate, Making natural cement and that of Gossan include As dimension stone, Cement manufacture, Construction aggregate, For road aggregate.

More about Pseudotachylite and Gossan

Here you can know more about Pseudotachylite and Gossan. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Pseudotachylite and Gossan consists of mineral content and compound content. The mineral content of Pseudotachylite includes Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides and mineral content of Gossan includes Apatite, Augite, Biotite, Bronzite, Calcite, Chert, Epidote, Feldspar, Hornblende, Micas, Plagioclase, Pyroxene, Quartz, Sulfides, Zircon. You can also check out the list of all Metamorphic Rocks. When we have to compare Pseudotachylite vs Gossan, the texture, color and appearance plays an important role in determining the type of rock. Pseudotachylite is available in black, brown, green, grey, pink, white colors whereas, Gossan is available in brown, brown- black, gold, green, rust colors. Appearance of Pseudotachylite is Dull and Soft and that of Gossan is Dull and Banded. Properties of rock is another aspect for Pseudotachylite vs Gossan. The hardness of Pseudotachylite is 7 and that of Gossan is 4-5. The types of Pseudotachylite are Cataclastic rock whereas types of Gossan are Translocated gossan and Leakage gossan. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Pseudotachylite is light to dark brown while that of Gossan is white to grey. The specific heat capacity of Pseudotachylite is 0.92 kJ/Kg K and that of Gossan is 0.24 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Pseudotachylite is heat resistant whereas Gossan is heat resistant, impact resistant, pressure resistant.

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