Eclogite

Nephelinite

Eclogite and Nephelinite

Eclogite

Nephelinite

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Definition

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

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

History

Origin

Brazil

Discoverer

René Just Haüy

Unknown

Etymology

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

from French néphéline, from Greek nephelē

Class

Metamorphic Rocks

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Hard Rock

Family

Group

Plutonic

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Earthy

Aphanitic

Color

Black, Brown, Green, Grey, Pink, White

Black, Brown, Green, Grey, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull, Banded and Foilated

Skeletal

Uses

Architecture

Interior Uses

Decorative Aggregates, Interior Decoration

Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

Paving 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, Construction Aggregate, for Road Aggregate

Medical Industry

In Chemical and Pharmaceutical Industry, Medicines and Cosmetics

Antiquity Uses

Artifacts

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Creating Artwork, Gemstone

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

Types

Eclogite

Peralkaline Nephelinite

Features

Available in Lots of Colors and Patterns, Generally rough to touch, Is one of the oldest rock

Host Rock for Lead

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

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

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.

Composition

Mineral Content

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

Clinopyroxene, Nepheline, Plagioclase

Compound Content

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

Ca, CaO, Carbon, Cl, MgO

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Mechanical Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Sea Erosion

Chemical Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

3.5-46.5

1 7

👆🏻

Grain Size

Fine Grained

Fracture

Flat

Streak

White

Porosity

Less Porous

Luster

Subvitreous to Dull

Vitreous to Metallic

Compressive Strength

200.00 N/mm²35.00 N/mm²

0.15 450

👆🏻

Cleavage

Perfect

Toughness

2.7

Specific Gravity

2.86-2.872.4-2.9

0 8.4

👆🏻

Transparency

Opaque

Density

3.2-3.6 g/cm³2.5-3 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.75 kJ/Kg K0.88 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

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

Japan

Africa

Ethiopia, Morocco, South Africa

Rwanda, Tanzania

Europe

France, Germany, Italy, Norway, Scotland

Others

Greenland

Hawaii Islands

Deposits in Western Continents

North America

Canada, Costa Rica, Panama, USA

Canada, USA

South America

Argentina, Brazil, Colombia, Ecuador

Colombia

Deposits in Oceania Continent

Australia

Central Australia, New Zealand, Queensland

All about Eclogite and Nephelinite Properties

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