Nephelinite

Eclogite

Nephelinite and Eclogite

Nephelinite

Eclogite

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Definition

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

Eclogite is an extreme metamorphic rock, formed by regional metamorphism of basalt rock under very high pressure and temperature

History

Origin

Brazil

Discoverer

Unknown

René Just Haüy

Etymology

from French néphéline, from Greek nephelē

From French, Greek eklogē selection with reference to the selective content of the rock + -ite1

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

Family

Group

Plutonic

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Aphanitic

Earthy

Color

Black, Brown, Green, Grey, White

Black, Brown, Green, Grey, Pink, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Skeletal

Dull, Banded and Foilated

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes, Interior Decoration

Decorative Aggregates, Interior Decoration

Exterior Uses

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

Paving Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

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

Medical Industry

In Chemical and Pharmaceutical Industry, Medicines and Cosmetics

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts

Other Uses

Commercial Uses

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

Creating Artwork, Gemstone

Types

Peralkaline Nephelinite

Eclogite

Features

Host Rock for Lead

Available in Lots of Colors and Patterns, Generally rough to touch, 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.

Eclogite forms from high-pressure metamorphism of mafic igneous rocks mainly, basalt or gabbro as it plunges into the mantle in a subduction zone.

Composition

Mineral Content

Clinopyroxene, Nepheline, Plagioclase

Amphibole, Coesite, Corundum, Dolomite, Garnet, Kyanite, Lawsonite, Paragonite, Phengite, Pyroxene, Quartz, Rutile, Zoisite

Compound Content

Ca, CaO, Carbon, Cl, MgO

Aluminium Oxide, NaCl, CaO, Carbon Dioxide, Iron(III) Oxide, Magnesium Carbonate, MgO, Sodium Oxide, Potassium, Sodium

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Water Erosion, Wind Erosion

Chemical Erosion, Sea Erosion

Properties

Physical Properties

Hardness

6.53.5-4

1 7

👆🏻

Grain Size

Fine Grained

Fracture

Flat

Streak

White

Porosity

Less Porous

Luster

Vitreous to Metallic

Subvitreous to Dull

Compressive Strength

35.00 N/mm²200.00 N/mm²

0.15 450

👆🏻

Cleavage

Perfect

Toughness

2.7

Specific Gravity

2.4-2.92.86-2.87

0 8.4

👆🏻

Transparency

Opaque

Density

2.5-3 g/cm³3.2-3.6 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.88 kJ/Kg K0.75 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

Japan

India, Kazakhstan, Kuwait, Russia, South Korea, Thailand, Turkey

Africa

Rwanda, Tanzania

Ethiopia, Morocco, South Africa

Europe

France, Germany, Italy, Norway, Scotland

Others

Hawaii Islands

Greenland

Deposits in Western Continents

North America

Canada, USA

Canada, Costa Rica, Panama, USA

South America

Colombia

Argentina, Brazil, Colombia, Ecuador

Deposits in Oceania Continent

Australia

Central Australia, New Zealand, Queensland

All about Nephelinite and Eclogite Properties

Know all about Nephelinite and Eclogite properties here. All properties of rocks are important as they define the type of rock and its application. Nephelinite belongs to Igneous Rocks while Eclogite belongs to Metamorphic Rocks.Texture of Nephelinite is Aphanitic whereas that of Eclogite is Earthy. Nephelinite appears Skeletal and Eclogite appears Dull, Banded and Foilated. The luster of Nephelinite is vitreous to metallic while that of Eclogite is subvitreous to dull. Nephelinite is available in black, brown, green, grey, white colors whereas Eclogite is available in black, brown, green, grey, pink, white colors. The commercial uses of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo) and that of Eclogite are creating artwork, gemstone.