Nephelinite

Icelandite

Nephelinite and Icelandite

Nephelinite

Icelandite

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Definition

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

Icelandite belongs to volcanic igneous rocks which is rich in iron and belongs to andesite rock

History

Origin

Brazil

Iceland

Discoverer

Unknown

Ian S. E. Carmichael

Etymology

from French néphéline, from Greek nephelē

From its origin place near Cenozoic volcano near the parsonage Þingmúli in East Iceland

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Plutonic

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Aphanitic

Aphanitic to Porphyritic

Color

Black, Brown, Green, Grey, White

Bluish - Grey, Grey, Pink, Yellow

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Skeletal

Dull and Soft

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes, Interior Decoration

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration, Kitchens

Exterior Uses

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

Office Buildings, Roof Tiles

Other Architectural Uses

Curbing

Industry

Construction Industry

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

Cobblestones, Construction Aggregate, for Road Aggregate

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Jewellery, Sculpture, Small Figurines

Other Uses

Commercial Uses

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

Cemetery Markers, Creating Artwork

Types

Peralkaline Nephelinite

Intermediate volcanic rock

Features

Host Rock for Lead

Generally rough to touch, High silica content, Is one of the oldest rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

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.

Icelandite 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

Clinopyroxene, Nepheline, Plagioclase

Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Ilmenite, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon

Compound Content

Ca, CaO, Carbon, Cl, MgO

Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Contact Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Water Erosion, Wind Erosion

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

Properties

Physical Properties

Hardness

6.57

1 7

👆🏻

Grain Size

Fine Grained

Very fine-grained

Fracture

Flat

Uneven

Streak

White

Porosity

Less Porous

Luster

Vitreous to Metallic

Vitreous

Compressive Strength

35.00 N/mm²200.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

2.7

1.1

Specific Gravity

2.4-2.92.5-2.8

0 8.4

👆🏻

Transparency

Opaque

Density

2.5-3 g/cm³2.11-2.36 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.88 kJ/Kg K2.39 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant

Heat Resistant, Pressure Resistant, Scratch Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Japan

India, Indonesia, Japan, Nepal, South Korea

Africa

Rwanda, Tanzania

Egypt, Ethiopia, Morocco, Namibia, South Africa, Tanzania

Europe

Austria, Finland, Germany, Italy, Romania, Turkey, United Kingdom

Others

Hawaii Islands

Deposits in Western Continents

North America

Canada, USA

Mexico, USA

South America

Colombia

Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela

Deposits in Oceania Continent

Australia

New South Wales, New Zealand, Western Australia

All about Nephelinite and Icelandite Properties

Know all about Nephelinite and Icelandite properties here. All properties of rocks are important as they define the type of rock and its application. Nephelinite and Icelandite belong to Igneous Rocks.Texture of Nephelinite is Aphanitic whereas that of Icelandite is Aphanitic to Porphyritic. Nephelinite appears Skeletal and Icelandite appears Dull and Soft. The luster of Nephelinite is vitreous to metallic while that of Icelandite is vitreous. Nephelinite is available in black, brown, green, grey, white colors whereas Icelandite is available in bluish - grey, grey, pink, yellow colors. The commercial uses of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo) and that of Icelandite are cemetery markers, creating artwork.