Tephrite

Anorthosite

Tephrite and Anorthosite

Tephrite

Anorthosite

Add ⊕

Definition

Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock

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

History

Origin

Germany

Discoverer

Van Tooren

Unknown

Etymology

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

From French anorthose plagioclase + -ite1

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Plutonic

Other Categories

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

Coarse Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Foliated, Glassy

Color

Black, Brown, Green, Grey, White

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

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Vesicular

Layered, Banded, Veined and Shiny

Uses

Architecture

Interior Uses

Decorative Aggregates, Flooring, Homes, Interior Decoration

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration

Exterior Uses

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

As Building Stone, As Facing Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

Landscaping

As Dimension Stone, Cement Manufacture, for Road Aggregate

Medical Industry

Antiquity Uses

Artifacts, Sculpture

Artifacts, Sculpture, Small Figurines

Other Uses

Commercial Uses

Production of Lime, Soil Conditioner

Creating Artwork, Curling

Types

Igneous rock

Proterozoic Anorthosite and Archean Anorthosite

Features

Host Rock for Lead

Generally rough to touch, Is one of the oldest rock

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.

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.

Composition

Mineral Content

Alkali feldspar, Nepheline, Plagioclase, Pyroxene

Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene

Compound Content

CaO, Carbon Dioxide, MgO, Silicon Dioxide

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

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

Cataclastic Metamorphism, Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering

Erosion

✔ ✘

Types of Erosion

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

Chemical Erosion, Wind Erosion

Properties

Physical Properties

Hardness

6.55-6

1 7

👆🏻

Grain Size

Medium to Fine Coarse Grained

Coarse Grained

Fracture

Uneven

Irregular

Streak

Bluish Black

White

Porosity

Very Less Porous

Less Porous

Luster

Subvitreous to Dull

Pearly to Subvitreous

Compressive Strength

90.00 N/mm²180.00 N/mm²

0.15 450

👆🏻

Cleavage

Crenulation and Pervasive

Toughness

2.4

Specific Gravity

2.862.62-2.82

0 8.4

👆🏻

Transparency

Opaque

Translucent

Density

2.8-2.9 g/cm³2.7-4 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, Pressure Resistant, Scratch Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Africa

Namibia, Uganda

Europe

Germany, Hungary, Italy, Portugal, Spain

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

Others

Deposits in Western Continents

North America

USA

Canada

South America

Bolivia, Colombia

Deposits in Oceania Continent

Australia

New Zealand, Western Australia

Central Australia, South Australia, Western Australia

All about Tephrite and Anorthosite Properties

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