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Adakite
Adakite

Pseudotachylite
Pseudotachylite



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Adakite
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Pseudotachylite

Adakite vs Pseudotachylite

Definition

Definition

Adakite is an intermediate to felsic volcanic rock that has geochemical characteristics of magma which is said to be formed by partial melting of altered basalt that is subducted below volcanic arcs
Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.

History

Origin

Adak, Aleutian Islands
USA

Discoverer

Defant and Drummond
Unknown

Etymology

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

Class

Igneous Rocks
Metamorphic Rocks

Sub-Class

Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock

Family

Group

Volcanic
-

Other Categories

Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock

Texture

Texture

Porphyritic
Quench

Color

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

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

Exterior Uses

As Building Stone, As Facing Stone, Office Buildings
As Building Stone, As Facing Stone, Garden Decoration

Other Architectural Uses

Whetstones
Curbing

Industry

Construction Industry

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone
As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement

Medical Industry

-
-

Antiquity Uses

Monuments, Sculpture, Small Figurines
Artifacts, Monuments

Other Uses

Commercial Uses

Commemorative Tablets, Pottery, Used in aquariums
Creating Artwork, Gemstone

Types

Types

Intermediate volcanic rock
Cataclastic rock

Features

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

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Absent

Formation

Formation

Adakite rocks are formed when the hydrous fluids are released from minerals that break down in metamorphosed basalt, and rise into the mantle they initiate partial melting.
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.

Composition

Mineral Content

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

Compound Content

Aluminium Oxide, MgO, Silicon Dioxide
Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur

Transformation

Metamorphism

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Weathering

Types of Weathering

Chemical Weathering, Mechanical Weathering
-

Erosion

Types of Erosion

Coastal Erosion, Sea Erosion, Water Erosion
-

Properties

Physical Properties

Hardness

3-47
1 7
👆🏻

Grain Size

Fine to Medium Grained
Very fine-grained

Fracture

Conchoidal
Uneven

Streak

Bluish Black
Light to dark brown

Porosity

Less Porous
Less Porous

Luster

Grainy, Pearly and Vitreous
Vitreous

Compressive Strength

200.00 N/mm260.00 N/mm2
0.15 450
👆🏻

Cleavage

-
-

Toughness

-
-

Specific Gravity

-99992.46-2.86
0 8.4
👆🏻

Transparency

Opaque
Transparent to Translucent

Density

-9999 g/cm32.7-2.9 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

0.84 kJ/Kg K0.92 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant
Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia
South Korea

Africa

Ethiopia, Somalia, South Africa
Western Africa

Europe

Iceland
Great Britain, Switzerland

Others

-
-

Deposits in Western Continents

North America

Canada, USA
-

South America

Brazil
-

Deposits in Oceania Continent

Australia

-
Central Australia, Western Australia

Adakite vs Pseudotachylite 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 Adakite and Pseudotachylite Reserves. Adakite is an intermediate to felsic volcanic rock that has geochemical characteristics of magma which is said to be formed by partial melting of altered basalt that is subducted below volcanic arcs. Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.. 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 Adakite vs Pseudotachylite information and Adakite vs Pseudotachylite characteristics in the upcoming sections.

Adakite vs Pseudotachylite 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. Adakite vs Pseudotachylite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Adakite and Properties of Pseudotachylite. Learn more about Adakite vs Pseudotachylite in the next section. The interior uses of Adakite include Decorative aggregates, Floor tiles, Homes, Hotels and Kitchens whereas the interior uses of Pseudotachylite include Decorative aggregates, Entryways and Interior decoration. Due to some exceptional properties of Adakite and Pseudotachylite, they have various applications in construction industry. The uses of Adakite in construction industry include As dimension stone, Cobblestones, Rail track ballast, Roadstone and that of Pseudotachylite include As dimension stone, Cement manufacture, For road aggregate, Making natural cement.

More about Adakite and Pseudotachylite

Here you can know more about Adakite and Pseudotachylite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Adakite and Pseudotachylite consists of mineral content and compound content. The mineral content of Adakite includes Olivine, Plagioclase, Pyroxene and mineral content of Pseudotachylite includes Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides. You can also check out the list of all Igneous Rocks. When we have to compare Adakite vs Pseudotachylite, the texture, color and appearance plays an important role in determining the type of rock. Adakite is available in black, brown, light to dark grey colors whereas, Pseudotachylite is available in black, brown, green, grey, pink, white colors. Appearance of Adakite is Dull and Soft and that of Pseudotachylite is Dull and Soft. Properties of rock is another aspect for Adakite vs Pseudotachylite. The hardness of Adakite is 3-4 and that of Pseudotachylite is 7. The types of Adakite are Intermediate volcanic rock whereas types of Pseudotachylite are Cataclastic rock. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Adakite is bluish black while that of Pseudotachylite is light to dark brown. The specific heat capacity of Adakite is 0.84 kJ/Kg K and that of Pseudotachylite is 0.92 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Adakite is heat resistant, pressure resistant, wear resistant whereas Pseudotachylite is heat resistant.