Trachyte

Pseudotachylite

Trachyte and Pseudotachylite

Trachyte

Pseudotachylite

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Definition

Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar

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

History

Origin

USA

Discoverer

Alexandre Brongniart and René Just Haüy

Unknown

Etymology

From Greek trakhus rough’ or trakhutēs roughness

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, Opaque Rock

Texture

Aphanitic to Porphyritic

Quench

Color

Black, Brown, Dark Greenish - Grey, Green, Grey, Light to Dark Grey, White

Black, Brown, Green, Grey, Pink, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Banded

Dull and Soft

Uses

Architecture

Interior Uses

Decorative Aggregates, Flooring, Homes, Interior Decoration

Decorative Aggregates, Entryways, Interior Decoration

Exterior Uses

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

As Building Stone, As Facing Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Manufacture of Magnesium and Dolomite Refractories

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

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Monuments

Other Uses

Commercial Uses

Cemetery Markers, Creating Artwork

Creating Artwork, Gemstone

Types

Felsic volcanic rock

Cataclastic rock

Features

Available in Lots of Colors and Patterns, Is one of the oldest rock, Matrix variable

Host Rock for Lead

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Trachyte is an igneous volcanic rock with an aphanitic to porphyritic texture. It is the volcanic equivalent of syenite rock and forms as a result of magmatic differentiation.

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

Augite, Biotite, Feldspar, Hornblade, Plagioclase, Quartz

Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides

Compound Content

Potassium Oxide, Sodium Oxide, Silicon Dioxide

Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

1 7

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Grain Size

Fine Grained

Very fine-grained

Fracture

Uneven

Streak

White

Light to dark brown

Porosity

Less Porous

Luster

Metallic

Vitreous

Compressive Strength

150.00 N/mm²60.00 N/mm²

0.15 450

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Cleavage

Toughness

Specific Gravity

2.72.46-2.86

0 8.4

👆🏻

Transparency

Opaque

Transparent to Translucent

Density

2.43-2.45 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, Impact Resistant, Wear Resistant

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Iran, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Vietnam

South Korea

Africa

Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa

Western Africa

Europe

Bulgaria, England, Germany, Norway, Romania, Switzerland

Great Britain, Switzerland

Others

Deposits in Western Continents

North America

USA

South America

Brazil, Chile

Deposits in Oceania Continent

Australia

New Zealand, Queensland, South Australia, Western Australia

Central Australia, Western Australia

All about Trachyte and Pseudotachylite Properties

Know all about Trachyte and Pseudotachylite properties here. All properties of rocks are important as they define the type of rock and its application. Trachyte belongs to Igneous Rocks while Pseudotachylite belongs to Metamorphic Rocks.Texture of Trachyte is Aphanitic to Porphyritic whereas that of Pseudotachylite is Quench. Trachyte appears Banded and Pseudotachylite appears Dull and Soft. The luster of Trachyte is metallic while that of Pseudotachylite is vitreous. Trachyte is available in black, brown, dark greenish - grey, green, grey, light to dark grey, white colors whereas Pseudotachylite is available in black, brown, green, grey, pink, white colors. The commercial uses of Trachyte are cemetery markers, creating artwork and that of Pseudotachylite are creating artwork, gemstone.