Nephelinite

Travertine

Nephelinite and Travertine

Nephelinite

Travertine

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Definition

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

Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters

History

Origin

Brazil

Italy

Discoverer

Unknown

Marcus Vitruvius Pollio

Etymology

from French néphéline, from Greek nephelē

From Italian travertino a kind of building stone, from Tiburs, adjective from Tibur (Tivoli), in Italy

Class

Igneous Rocks

Sedimentary Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

Family

Group

Plutonic

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Aphanitic

Banded

Color

Black, Brown, Green, Grey, White

Beige, Black, Blue, Brown, Grey, Red, White, Yellow

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Skeletal

Fibrous

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes, Interior Decoration

Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration

Exterior Uses

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

As Building Stone, As Facing Stone, 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, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Raw material for the manufacture of mortar

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Jewellery, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

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

Cemetery Markers, Creating Artwork, Gemstone, Jewelry, Paper Industry, Pottery

Types

Peralkaline Nephelinite

Thermal Travertine and Tufa

Features

Host Rock for Lead

Stalactites and stalagmites are formed from this rock, Surfaces are often shiny, Very fine grained rock

Archaeological Significance

Monuments

Famous Monuments

Colosseum in Rome, Italy, Sacré Coeur in Paris, France, Trevi Fountain in Rome, Italy

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

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.

Travertine is a type of sedimentary rock formed when a river carries or transports pieces of broken rock which then undergo sedimentation. They are then subjected to high temperature and pressure hence forming travertine rock.

Composition

Mineral Content

Clinopyroxene, Nepheline, Plagioclase

Calcite, Clay, Feldspar, Micas, Quartz

Compound Content

Ca, CaO, Carbon, Cl, MgO

Ca, NaCl, CaO, Oxygen

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Water Erosion, Wind Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

Properties

Physical Properties

Hardness

6.53-4

1 7

👆🏻

Grain Size

Fine Grained

Fracture

Flat

Splintery

Streak

White

Porosity

Less Porous

Highly Porous

Luster

Vitreous to Metallic

Dull to Pearly

Compressive Strength

35.00 N/mm²80.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

2.7

Specific Gravity

2.4-2.91.68

0 8.4

👆🏻

Transparency

Opaque

Density

2.5-3 g/cm³2.71 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.88 kJ/Kg K1.09 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant

Impact Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Japan

China, Russia

Africa

Rwanda, Tanzania

Europe

Austria, Italy, Portugal, United Kingdom

Others

Hawaii Islands

Deposits in Western Continents

North America

Canada, USA

South America

Colombia

Argentina, Bolivia, Ecuador

Deposits in Oceania Continent

Australia

All about Nephelinite and Travertine Properties

Know all about Nephelinite and Travertine properties here. All properties of rocks are important as they define the type of rock and its application. Nephelinite belongs to Igneous Rocks while Travertine belongs to Sedimentary Rocks.Texture of Nephelinite is Aphanitic whereas that of Travertine is Banded. Nephelinite appears Skeletal and Travertine appears Fibrous. The luster of Nephelinite is vitreous to metallic while that of Travertine is dull to pearly. Nephelinite is available in black, brown, green, grey, white colors whereas Travertine is available in beige, black, blue, brown, grey, red, white, yellow colors. The commercial uses of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo) and that of Travertine are cemetery markers, creating artwork, gemstone, jewelry, paper industry, pottery.