Nephelinite

Blueschist

Nephelinite and Blueschist

Nephelinite

Blueschist

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Definition

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

Blueschist is a metamorphic rock which is generally blue in color and is formed under conditions of high pressure and low temperature

History

Origin

Brazil

USA

Discoverer

Unknown

Edgar Bailey

Etymology

from French néphéline, from Greek nephelē

From French schiste, Greek skhistos i.e. split

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

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Aphanitic

Foliated

Color

Black, Brown, Green, Grey, White

Blue, Bluish - Grey, Purple, Shades of Blue

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Skeletal

Dull and Banded

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes, Interior Decoration

Floor Tiles, Flooring, Homes, Hotels, Kitchens

Exterior Uses

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

Garden Decoration, Office Buildings

Other Architectural Uses

Curbing

Industry

Construction Industry

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

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

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

Cemetery Markers, Commemorative Tablets, Creating Artwork, Curling, Tombstones

Types

Peralkaline Nephelinite

Metamorphic rock

Features

Host Rock for Lead

Has High structural resistance against erosion and climate, Very fine grained 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.

Blueschist forms due to the metamorphism of basalt and other rocks with similar composition at high pressures and low temperatures and approximately corresponding to a depth of 15 to 30 kilometers and 200 to 500 °C.

Composition

Mineral Content

Clinopyroxene, Nepheline, Plagioclase

Albite, Chlorite, Epidote, Garnet, Glaucophane, Lawsonite, Muscovite or Illite, Quartz

Compound Content

Ca, CaO, Carbon, Cl, MgO

Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide

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, Coastal Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

6.53.5-4

1 7

👆🏻

Grain Size

Fine Grained

Fine to Medium Grained

Fracture

Flat

Conchoidal

Streak

White

White to Grey

Porosity

Less Porous

Highly Porous

Luster

Vitreous to Metallic

Dull

Compressive Strength

35.00 N/mm²220.00 N/mm²

0.15 450

👆🏻

Cleavage

Slaty

Toughness

2.7

1.5

Specific Gravity

2.4-2.93-3.2

0 8.4

👆🏻

Transparency

Opaque

Density

2.5-3 g/cm³2.8-2.9 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.88 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant

Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

Japan

Japan, Turkey

Africa

Rwanda, Tanzania

Egypt, Ethiopia, South Africa

Europe

France, Greece, Iceland

Others

Hawaii Islands

Deposits in Western Continents

North America

Canada, USA

USA

South America

Colombia

Deposits in Oceania Continent

Australia

New Zealand

All about Nephelinite and Blueschist Properties

Know all about Nephelinite and Blueschist properties here. All properties of rocks are important as they define the type of rock and its application. Nephelinite belongs to Igneous Rocks while Blueschist belongs to Metamorphic Rocks.Texture of Nephelinite is Aphanitic whereas that of Blueschist is Foliated. Nephelinite appears Skeletal and Blueschist appears Dull and Banded. The luster of Nephelinite is vitreous to metallic while that of Blueschist is dull. Nephelinite is available in black, brown, green, grey, white colors whereas Blueschist is available in blue, bluish - grey, purple, shades of blue colors. The commercial uses of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo) and that of Blueschist are cemetery markers, commemorative tablets, creating artwork, curling, tombstones.