Anorthosite

Tephrite

Anorthosite and Tephrite

Anorthosite

Tephrite

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Definition

Anorthosite is a granular igneous rock composed largely of labradorite or plagioclase

Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock

History

Origin

Germany

Discoverer

Unknown

Van Tooren

Etymology

From French anorthose plagioclase + -ite1

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

Class

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Hard Rock

Family

Group

Plutonic

Volcanic

Other Categories

Coarse Grained Rock, Opaque Rock

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

Texture

Foliated, Glassy

Aphanitic to Porphyritic

Color

Black, Bluish - Grey, Brown, Green, Grey, Light Greenish Grey, Pink, White

Black, Brown, Green, Grey, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Layered, Banded, Veined and Shiny

Vesicular

Uses

Architecture

Interior Uses

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration

Decorative Aggregates, Flooring, Homes, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration

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

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Cement Manufacture, for Road Aggregate

Landscaping

Medical Industry

Antiquity Uses

Artifacts, Sculpture, Small Figurines

Artifacts, Sculpture

Other Uses

Commercial Uses

Creating Artwork, Curling

Production of Lime, Soil Conditioner

Types

Proterozoic Anorthosite and Archean Anorthosite

Igneous rock

Features

Generally rough to touch, Is one of the oldest rock

Host Rock for Lead

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Anorthosite is a phaneritic, intrusive igneous rock which is characterized by a predominance of plagioclase feldspar which is almost 90–100%, and a minimal mafic component.

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.

Composition

Mineral Content

Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene

Alkali feldspar, Nepheline, Plagioclase, Pyroxene

Compound Content

Ca, CaO, Chromium(III) Oxide, MgO, Sulfur Trioxide

CaO, Carbon Dioxide, MgO, Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Wind Erosion

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

Properties

Physical Properties

Hardness

5-66.5

1 7

👆🏻

Grain Size

Coarse Grained

Medium to Fine Coarse Grained

Fracture

Irregular

Uneven

Streak

White

Bluish Black

Porosity

Less Porous

Very Less Porous

Luster

Pearly to Subvitreous

Subvitreous to Dull

Compressive Strength

180.00 N/mm²90.00 N/mm²

0.15 450

👆🏻

Cleavage

Crenulation and Pervasive

Toughness

2.4

Specific Gravity

2.62-2.822.86

0 8.4

👆🏻

Transparency

Translucent

Opaque

Density

2.7-4 g/cm³2.8-2.9 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, Pressure Resistant, Scratch Resistant, Wear Resistant

Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

Africa

Namibia, Uganda

Europe

Bulgaria, France, Germany, Greece, Hungary, Italy, Latvia, Lithuania, Malta, Poland, Portugal, Romania, Slovenia, Spain, Sweden, The Czech Republic

Germany, Hungary, Italy, Portugal, Spain

Others

Deposits in Western Continents

North America

Canada

USA

South America

Bolivia, Colombia

Deposits in Oceania Continent

Australia

Central Australia, South Australia, Western Australia

New Zealand, Western Australia

All about Anorthosite and Tephrite Properties

Know all about Anorthosite and Tephrite properties here. All properties of rocks are important as they define the type of rock and its application. Anorthosite and Tephrite belong to Igneous Rocks.Texture of Anorthosite is Foliated, Glassy whereas that of Tephrite is Aphanitic to Porphyritic. Anorthosite appears Layered, Banded, Veined and Shiny and Tephrite appears Vesicular. The luster of Anorthosite is pearly to subvitreous while that of Tephrite is subvitreous to dull. Anorthosite and Tephrite are available in black, bluish - grey, brown, green, grey, light greenish grey, pink, white colors. The commercial uses of Anorthosite are creating artwork, curling and that of Tephrite are production of lime, soil conditioner.