Anorthosite

Gabbro

Anorthosite and Gabbro

Anorthosite

Gabbro

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Definition

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

Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt

History

Origin

Germany

Discoverer

Unknown

Christian Leopold von Buch

Etymology

From French anorthose plagioclase + -ite1

From Latin glaber bare, smooth, bald

Class

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Hard Rock

Family

Group

Plutonic

Other Categories

Coarse Grained Rock, Opaque Rock

Texture

Foliated, Glassy

Phaneritic

Color

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

Dark Grey to Black

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Layered, Banded, Veined and Shiny

Veined and Shiny

Uses

Architecture

Interior Uses

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration

Countertops, Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration

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

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Cement Manufacture, for Road Aggregate

As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate

Medical Industry

Antiquity Uses

Artifacts, Sculpture, Small Figurines

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

Creating Artwork, Curling

Cemetery Markers, Commemorative Tablets, Laboratory bench tops, Jewelry, Sea Defence, Tombstones

Types

Proterozoic Anorthosite and Archean Anorthosite

Anorthosite Gabbro and Norite Gabbro

Features

Generally rough to touch, Is one of the oldest rock

Smooth to touch

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.

Gabbro, a mafic rock, forms due to cooling and crystallization of magma underneath Earth's surface.

Composition

Mineral Content

Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene

Augite, Olivine, Plagioclase, Pyroxene

Compound Content

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

Aluminium Oxide, CaO, Chromium(III) Oxide, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Sulfur Trioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism

Impact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering

Chemical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Wind Erosion

Coastal Erosion

Properties

Physical Properties

Hardness

5-67

1 7

👆🏻

Grain Size

Coarse Grained

Fracture

Irregular

Conchoidal

Streak

White

Black

Porosity

Less Porous

Highly Porous

Luster

Pearly to Subvitreous

Compressive Strength

180.00 N/mm²225.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

1.6

Specific Gravity

2.62-2.822.86-2.87

0 8.4

👆🏻

Transparency

Translucent

Opaque

Density

2.7-4 g/cm³2.7-3.3 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.84 kJ/Kg K0.71 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Scratch Resistant, Wear Resistant

Impact Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia

Africa

South Africa

Europe

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

Germany, Greece, Italy, Scotland, Turkey

Others

Greenland

Deposits in Western Continents

North America

Canada

Canada, USA

South America

Bolivia, Colombia

Brazil, Colombia, Venezuela

Deposits in Oceania Continent

Australia

Central Australia, South Australia, Western Australia

New Zealand, Queensland

All about Anorthosite and Gabbro Properties

Know all about Anorthosite and Gabbro properties here. All properties of rocks are important as they define the type of rock and its application. Anorthosite and Gabbro belong to Igneous Rocks.Texture of Anorthosite is Foliated, Glassy whereas that of Gabbro is Phaneritic. Anorthosite appears Layered, Banded, Veined and Shiny and Gabbro appears Veined and Shiny. The luster of Anorthosite is pearly to subvitreous while that of Gabbro is . Anorthosite is available in black, bluish - grey, brown, green, grey, light greenish grey, pink, white colors whereas Gabbro is available in dark grey to black colors. The commercial uses of Anorthosite are creating artwork, curling and that of Gabbro are cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones.