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Pseudotachylite
Pseudotachylite

Epidosite
Epidosite



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Pseudotachylite
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Epidosite

Pseudotachylite vs Epidosite

Definition

Definition

Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.
Epidosite is a highly altered epidote and quartz bearing rock which is a type of metasomatite, essentially altered basalt

History

Origin

USA
-

Discoverer

Unknown
Unknown

Etymology

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

Metamorphic Rocks
Igneous Rocks

Sub-Class

Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock

Family

Group

-
Volcanic

Other Categories

Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Opaque Rock

Texture

Texture

Quench
Glassy, Massive, Porphyritic, Scoriaceous, Vesicular

Color

Black, Brown, Green, Grey, Pink, White
Black, Brown, Light to Dark Grey

Maintenance

Less
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Dull and Soft
Dull and Soft

Uses

Architecture

Interior Uses

Decorative Aggregates, Entryways, Interior Decoration
Decorative Aggregates, Floor Tiles, Homes, Hotels, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration
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, Cobblestones, Rail Track Ballast, Roadstone

Medical Industry

-
-

Antiquity Uses

Artifacts, Monuments
Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Creating Artwork, Gemstone
Commemorative Tablets, Creating Artwork

Types

Types

Cataclastic rock
Alkaline Basalt, Boninite, High Alumina Basalt, Mid Ocean Ridge Basalt (MORB), Tholeiitic Basalt, Basaltic trachyandesite, Mugearite and Shoshonite

Features

Host Rock for Lead
Has High structural resistance against erosion and climate, Very fine grained rock

Archaeological Significance

Monuments

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Famous Monuments

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Sculpture

-
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Famous Sculptures

-
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Pictographs

-
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Petroglyphs

-
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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.
Epidosite 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

Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides
Olivine, Plagioclase, Pyroxene

Compound Content

Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide

Transformation

Metamorphism

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism

Weathering

Types of Weathering

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Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

Types of Erosion

-
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Properties

Physical Properties

Hardness

76
1 7
👆🏻

Grain Size

Very fine-grained
Fine to Coarse Grained

Fracture

Uneven
Conchoidal

Streak

Light to dark brown
White to Grey

Porosity

Less Porous
Less Porous

Luster

Vitreous
-

Compressive Strength

60.00 N/mm2160.00 N/mm2
0.15 450
👆🏻

Cleavage

-
-

Toughness

-
2.3

Specific Gravity

2.46-2.862.8-3
0 8.4
👆🏻

Transparency

Transparent to Translucent
Opaque

Density

2.7-2.9 g/cm3-9999 g/cm3
0 1400
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Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K0.84 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant
Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

South Korea
India, Russia

Africa

Western Africa
South Africa

Europe

Great Britain, Switzerland
Iceland

Others

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Deposits in Western Continents

North America

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Canada, USA

South America

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Brazil

Deposits in Oceania Continent

Australia

Central Australia, Western Australia
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Pseudotachylite vs Epidosite 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 Epidosite Reserves. Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.. Epidosite is a highly altered epidote and quartz bearing rock which is a type of metasomatite, essentially altered basalt. 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 Epidosite information and Pseudotachylite vs Epidosite characteristics in the upcoming sections.

Pseudotachylite vs Epidosite 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 Epidosite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Pseudotachylite and Properties of Epidosite. Learn more about Pseudotachylite vs Epidosite in the next section. The interior uses of Pseudotachylite include Decorative aggregates, Entryways and Interior decoration whereas the interior uses of Epidosite include Decorative aggregates, Floor tiles, Homes, Hotels and Interior decoration. Due to some exceptional properties of Pseudotachylite and Epidosite, 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 Epidosite include As dimension stone, Cobblestones, Rail track ballast, Roadstone.

More about Pseudotachylite and Epidosite

Here you can know more about Pseudotachylite and Epidosite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Pseudotachylite and Epidosite consists of mineral content and compound content. The mineral content of Pseudotachylite includes Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides and mineral content of Epidosite includes Olivine, Plagioclase, Pyroxene. You can also check out the list of all Metamorphic Rocks. When we have to compare Pseudotachylite vs Epidosite, 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, Epidosite is available in black, brown, light to dark grey colors. Appearance of Pseudotachylite is Dull and Soft and that of Epidosite is Dull and Soft. Properties of rock is another aspect for Pseudotachylite vs Epidosite. The hardness of Pseudotachylite is 7 and that of Epidosite is 6. The types of Pseudotachylite are Cataclastic rock whereas types of Epidosite are Alkaline Basalt, Boninite, High Alumina Basalt, Mid Ocean Ridge Basalt (MORB), Tholeiitic Basalt, Basaltic trachyandesite, Mugearite and Shoshonite. 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 Epidosite is white to grey. The specific heat capacity of Pseudotachylite is 0.92 kJ/Kg K and that of Epidosite is 0.84 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 Epidosite is heat resistant, pressure resistant, wear resistant.