Nephelinite and Marl

Nephelinite

Marl

Definition

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

Marl is an unconsolidated sedimentary rock consisting of clay and lime

History

Origin

Brazil

Unknown

Discoverer

Unknown

Etymology

from French néphéline, from Greek nephelē

From Old French marle, from Late Latin marglia

Class

Igneous Rocks

Sedimentary Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Soft Rock

Family

Group

Plutonic

Not Applicable

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Aphanitic

Earthy

Color

Black, Brown, Colourless, Green, Grey, White

Beige, Brown, Green, Grey, White

Maintenance

Less

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Yes

Stain Resistant

Yes

Wind Resistant

Yes

Acid Resistant

Yes

Appearance

Skeletal

Rough and Dull

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes, Interior Decoration

Decorative Aggregates, Floor Tiles

Exterior Uses

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

As Building Stone, Roof Tiles

Other Architectural Uses

Curbing

Industry

Construction Industry

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

Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar

Medical Industry

Not Yet Used

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Jewellery, Sculpture, Small Figurines

Other Uses

Commercial Uses

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

Creating Artwork, Soil Conditioner

Types

Peralkaline Nephelinite

Clay Marl ,Blue Marl, Red Marl, High Bank Marl, Shell Layer Marl, Under Shell Layer Marl, Sand Marl, Green Marl, Grey Marl and Clayey Marl

Features

Host Rock for Lead

Generally rough to touch, Is one of the oldest rock, Splintery, Very fine grained rock

Archaeological Significance

Monuments

Used

Not Yet Used

Famous Monuments

Data Not Available

Not Applicable

Sculpture

Used

Famous Sculptures

Data Not Available

Pictographs

Not Used

Used

Petroglyphs

Not Used

Used

Figurines

Used

Fossils

Absent

Present

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.

Marl forms when very fine-grained clay particles are deposited in water which settles at the bottom of water bodies and are compacted by overlying sediment; the water squeezes out and hence forming Marl rock.

Composition

Mineral Content

Clinopyroxene, Nepheline, Plagioclase

Calcite, Clay, Dolomite, Gypsum, Micas, Pyrite, Quartz

Compound Content

Ca, CaO, Carbon, Cl, MgO

Aluminium Oxide, NaCl, CaO, Iron(III) Oxide, Silicon Dioxide

Transformation

Metamorphism

Yes

Types of Metamorphism

Contact Metamorphism

Not Applicable

Weathering

Yes

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering, Chemical Weathering

Erosion

Yes

Types of Erosion

Chemical Erosion, Water Erosion, Wind Erosion

Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

6.5

2-3

Grain Size

Fine Grained

Very fine-grained

Fracture

Flat

Conchoidal

Streak

White

Porosity

Less Porous

Highly Porous

Luster

Vitreous to Metallic

Dull

Compressive Strength

35.00 N/mm²

Not Available

Cleavage

Imperfect

Not Available

Toughness

2.7

2.6

Specific Gravity

2.4-2.9

2.2-2.8

Transparency

Opaque

Density

2.5-3 g/cm³

2.4-2.8 g/cm³

Thermal Properties

Specific Heat Capacity

0.88 kJ/Kg K

Not Available

Resistance

Heat Resistant

Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

Japan

India, Pakistan, Russia

Africa

Rwanda, Tanzania

Ethiopia, Kenya, Morocco, South Africa

Europe

Not Yet Found

Austria, France, Germany, Greece, Italy, Romania, Scotland, Spain, Switzerland

Others

Hawaii Islands

Not Yet Found

Deposits in Western Continents

North America

Canada, USA

USA

South America

Colombia

Colombia, Ecuador, Peru

Deposits in Oceania Continent

Australia

Not Yet Found

New South Wales, Victoria, Western Australia

Summary >>

<< Reserves

All about Nephelinite and Marl Properties

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