Pseudotachylite

Boninite

Pseudotachylite and Boninite

Pseudotachylite

Boninite

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Definition

Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.

Boninite is a mafic extrusive rock which is high in magnesium and silica content, formed in fore-arc environments, typically during the early stages of subduction

History

Origin

USA

Japan

Discoverer

Unknown

Etymology

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

From its occurrence in the Izu-Bonin arc south of Japan

Class

Metamorphic Rocks

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Quench

Aphanitic to Porphyritic

Color

Black, Brown, Green, Grey, Pink, White

Bluish - Grey, Brown, Green, Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Soft

Uses

Architecture

Interior Uses

Decorative Aggregates, Entryways, Interior Decoration

Decorative Aggregates, Homes, Kitchens

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration

Garden Decoration, Office Buildings

Other Architectural Uses

Curbing

Industry

Construction Industry

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

As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement, Manufacture of Magnesium and Dolomite Refractories

Medical Industry

Antiquity Uses

Artifacts, Monuments

Artifacts

Other Uses

Commercial Uses

Creating Artwork, Gemstone

An Oil and Gas Reservoir, Cemetery Markers, Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)

Types

Cataclastic rock

Basalt

Features

Host Rock for Lead

Available in Lots of Colors and Patterns, High Mg content, Is one of the oldest rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

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.

Boninite is a type of Igneous rock which is formed through the cooling and solidification of lava or existing rocks.

Composition

Mineral Content

Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides

Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Ilmenite

Compound Content

Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur

Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Wind Erosion

Properties

Physical Properties

Hardness

1 7

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Grain Size

Very fine-grained

Fine Grained

Fracture

Uneven

Streak

Light to dark brown

White

Porosity

Less Porous

Luster

Vitreous

Compressive Strength

60.00 N/mm²150.00 N/mm²

0.15 450

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Cleavage

Toughness

1.1

Specific Gravity

2.46-2.862.5-2.8

0 8.4

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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, Impact Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

South Korea

Africa

Western Africa

South Africa

Europe

Great Britain, Switzerland

England, Finland, United Kingdom

Others

Antarctica, Greenland

Deposits in Western Continents

North America

USA

South America

Colombia, Uruguay

Deposits in Oceania Continent

Australia

Central Australia, Western Australia

New Zealand, Western Australia

All about Pseudotachylite and Boninite Properties

Know all about Pseudotachylite and Boninite properties here. All properties of rocks are important as they define the type of rock and its application. Pseudotachylite belongs to Metamorphic Rocks while Boninite belongs to Igneous Rocks.Texture of Pseudotachylite is Quench whereas that of Boninite is Aphanitic to Porphyritic. Pseudotachylite appears Dull and Soft and Boninite appears Dull and Soft. The luster of Pseudotachylite and Boninite is vitreous. Pseudotachylite is available in black, brown, green, grey, pink, white colors whereas Boninite is available in bluish - grey, brown, green, grey colors. The commercial uses of Pseudotachylite are creating artwork, gemstone and that of Boninite are an oil and gas reservoir, cemetery markers, creating artwork, soil conditioner, source of magnesia (mgo).