Nephelinite

Anorthosite

Nephelinite and Anorthosite

Nephelinite

Anorthosite

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1 Definition

1.1 Definition

Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite).

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

1.2 History

1.2.1 Origin

Brazil

Unknown

1.2.2 Discoverer

Unknown

1.3 Etymology

from French néphéline, from Greek nephelē

From French anorthose plagioclase + -ite1

1.4 Class

Igneous Rocks

1.4.1 Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

1.5 Family

1.5.1 Group

Plutonic

1.6 Other Categories

Fine Grained Rock, Opaque Rock

Coarse Grained Rock, Opaque Rock

2 Texture

2.1 Texture

Aphanitic

Foliated, Glassy

2.2 Color

Black, Brown, Colourless, Green, Grey, White

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

2.3 Maintenance

Less

2.4 Durability

Durable

2.4.1 Water Resistant

✔ ✘

2.4.2 Scratch Resistant

✔ ✘

2.4.3 Stain Resistant

✔ ✘

2.4.4 Wind Resistant

✔ ✘

2.4.5 Acid Resistant

✔ ✘

2.5 Appearance

Skeletal

Layered, Banded, Veined and Shiny

3 Uses

3.1 Architecture

3.1.1 Interior Uses

Decorative Aggregates, Homes, Interior Decoration

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration

3.1.2 Exterior Uses

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

As Building Stone, As Facing Stone, Garden Decoration

3.1.3 Other Architectural Uses

Curbing

3.2 Industry

3.2.1 Construction Industry

As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate

As Dimension Stone, Cement Manufacture, for Road Aggregate

3.2.2 Medical Industry

Not Yet Used

3.3 Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Sculpture, Small Figurines

3.4 Other Uses

3.4.1 Commercial Uses

Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)

Creating Artwork, Curling

4 Types

4.1 Types

Peralkaline Nephelinite

Proterozoic Anorthosite and Archean Anorthosite

4.2 Features

Host Rock for Lead

Generally rough to touch, Is one of the oldest rock

4.3 Archaeological Significance

4.3.1 Monuments

Used

Not Yet Used

4.3.2 Famous Monuments

Data Not Available

Not Applicable

4.3.3 Sculpture

Used

4.3.4 Famous Sculptures

Data Not Available

Not Applicable

4.3.5 Pictographs

Not Used

4.3.6 Petroglyphs

Not Used

4.3.7 Figurines

Used

4.4 Fossils

Absent

5 Formation

5.1 Formation

Nephelinite 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.

5.2 Composition

5.2.1 Mineral Content

Clinopyroxene, Nepheline, Plagioclase

Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene

5.2.2 Compound Content

Ca, CaO, Carbon, Cl, MgO

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

5.3 Transformation

5.3.1 Metamorphism

✔ ✘

5.3.2 Types of Metamorphism

Contact Metamorphism

Cataclastic Metamorphism, Contact Metamorphism

5.3.3 Weathering

✔ ✘

5.3.4 Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering

5.3.5 Erosion

✔ ✘

5.3.6 Types of Erosion

Chemical Erosion, Water Erosion, Wind Erosion

Chemical Erosion, Wind Erosion

6 Properties

6.1 Physical Properties

6.1.1 Hardness

6.55-6

1 7

6.1.2 Grain Size

Fine Grained

Coarse Grained

6.1.3 Fracture

Flat

Irregular

6.1.4 Streak

White

6.1.5 Porosity

Less Porous

6.1.6 Luster

Vitreous to Metallic

Pearly to Subvitreous

6.1.7 Compressive Strength

35.00 N/mm²NA

0.15 450

6.1.8 Cleavage

Imperfect

Irregular

6.1.9 Toughness

2.7

Not Available

6.1.10 Specific Gravity

2.4-2.92.62-2.82

0 8.4

6.1.11 Transparency

Opaque

Translucent

6.1.12 Density

2.5-3 g/cm³2.7-4 g/cm³

0 1400

6.2 Thermal Properties

6.2.1 Specific Heat Capacity

0.88 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

6.2.2 Resistance

Heat Resistant

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

7 Reserves

7.1 Deposits in Eastern Continents

7.1.1 Asia

Japan

Not Yet Found

7.1.2 Africa

Rwanda, Tanzania

Not Yet Found

7.1.3 Europe

Not Yet Found

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

7.1.4 Others

Hawaii Islands

Not Yet Found

7.2 Deposits in Western Continents

7.2.1 North America

Canada, USA

Canada

7.2.2 South America

Colombia

Bolivia, Colombia

7.3 Deposits in Oceania Continent

7.3.1 Australia

Not Yet Found

Central Australia, South Australia, Western Australia

All about Nephelinite and Anorthosite Properties

Know all about Nephelinite and Anorthosite properties here. All properties of rocks are important as they define the type of rock and its application. Nephelinite and Anorthosite belong to Igneous Rocks.Texture of Nephelinite is Aphanitic whereas that of Anorthosite is Foliated, Glassy. Nephelinite appears Skeletal and Anorthosite appears Layered, Banded, Veined and Shiny. The luster of Nephelinite is vitreous to metallic while that of Anorthosite is pearly to subvitreous. Nephelinite is available in black, brown, colourless, 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 Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo) and that of Anorthosite are creating artwork, curling.