Tephrite

Trachyte

Tephrite and Trachyte

Tephrite

Trachyte

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Definition

Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock

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

History

Origin

Germany

Discoverer

Van Tooren

Alexandre Brongniart and René Just Haüy

Etymology

From Greek tephra, ashes from Indo-European base, to burn

From Greek trakhus rough’ or trakhutēs roughness

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Other Categories

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

Fine Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Color

Black, Brown, Green, Grey, White

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

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Vesicular

Banded

Uses

Architecture

Interior Uses

Decorative Aggregates, Flooring, Homes, Interior Decoration

Exterior Uses

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

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

Other Architectural Uses

Curbing

Industry

Construction Industry

Landscaping

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

Medical Industry

Antiquity Uses

Artifacts, Sculpture

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Production of Lime, Soil Conditioner

Cemetery Markers, Creating Artwork

Types

Igneous rock

Felsic volcanic rock

Features

Host Rock for Lead

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

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Tephrite 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.

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.

Composition

Mineral Content

Alkali feldspar, Nepheline, Plagioclase, Pyroxene

Augite, Biotite, Feldspar, Hornblade, Plagioclase, Quartz

Compound Content

CaO, Carbon Dioxide, MgO, Silicon Dioxide

Potassium Oxide, Sodium Oxide, Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Regional 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

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

Properties

Physical Properties

Hardness

6.56

1 7

👆🏻

Grain Size

Medium to Fine Coarse Grained

Fine Grained

Fracture

Uneven

Streak

Bluish Black

White

Porosity

Very Less Porous

Less Porous

Luster

Subvitreous to Dull

Metallic

Compressive Strength

90.00 N/mm²150.00 N/mm²

0.15 450

👆🏻

Cleavage

Crenulation and Pervasive

Toughness

2.4

Specific Gravity

2.862.7

0 8.4

👆🏻

Transparency

Opaque

Density

2.8-2.9 g/cm³2.43-2.45 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant

Heat Resistant, Impact Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

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

Africa

Namibia, Uganda

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

Europe

Germany, Hungary, Italy, Portugal, Spain

Bulgaria, England, Germany, Norway, Romania, Switzerland

Others

Deposits in Western Continents

North America

USA

South America

Brazil, Chile

Deposits in Oceania Continent

Australia

New Zealand, Western Australia

New Zealand, Queensland, South Australia, Western Australia

All about Tephrite and Trachyte Properties

Know all about Tephrite and Trachyte properties here. All properties of rocks are important as they define the type of rock and its application. Tephrite and Trachyte belong to Igneous Rocks.Texture of Tephrite is Aphanitic to Porphyritic whereas that of Trachyte is Aphanitic to Porphyritic. Tephrite appears Vesicular and Trachyte appears Banded. The luster of Tephrite is subvitreous to dull while that of Trachyte is metallic. Tephrite is available in black, brown, green, grey, white colors whereas Trachyte is available in black, brown, dark greenish - grey, green, grey, light to dark grey, white colors. The commercial uses of Tephrite are production of lime, soil conditioner and that of Trachyte are cemetery markers, creating artwork.