Definition
Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite).
Cataclasite is a type of cataclastic rock that is formed by fracturing and comminution during faulting. It is normally cohesive and non-foliated, consisting of angular clasts in a finer-grained matrix
Origin
Brazil
Swiss Alps, Europe
Discoverer
Unknown
Michael Tellinger
Etymology
from French néphéline, from Greek nephelē
From the Italian word cataclasi
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock
Texture
Aphanitic
Clastic
Color
Black, Brown, Green, Grey, White
Brown, Green, White, Yellow
Durability
Durable
Durable
Appearance
Skeletal
Dull and Banded
Interior Uses
Decorative Aggregates, Homes, Interior Decoration
Decorative Aggregates, Homes
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
As Building Stone, As Facing Stone, Paving Stone
Other Architectural Uses
Curbing
Curbing
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
Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines
Artifacts
Commercial Uses
Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)
Commemorative Tablets, Creating Artwork
Types
Peralkaline Nephelinite
Protocataclasite, Mesocataclasite, Ultracataclasite and Foliated cataclasite
Features
Host Rock for Lead
Easily splits into thin plates, Is one of the oldest rock
Archaeological Significance
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.
Cataclasiste rocks mainly form by pressure deep under the Earth's surface, from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.
Mineral Content
Clinopyroxene, Nepheline, Plagioclase
Albite, Apatite, Augite, Biotite, Calcite, Enstatite, Epidote, Feldspar, Micas, Muscovite or Illite, Pyroxene, Quartz
Compound Content
Ca, CaO, Carbon, Cl, MgO
Silicon Dioxide
Types of Metamorphism
Contact Metamorphism
-
Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Mechanical Weathering
Types of Erosion
Chemical Erosion, Water Erosion, Wind Erosion
Coastal Erosion, Wind Erosion
Grain Size
Fine Grained
Fine Grained
Porosity
Less Porous
Less Porous
Luster
Vitreous to Metallic
Vitreous
Specific Gravity
2.4-2.9
2.1
Transparency
Opaque
Translucent to Opaque
Density
2.5-3 g/cm3
2.9-3.1 g/cm3
Resistance
Heat Resistant
Heat Resistant, Impact Resistant, Pressure Resistant
Deposits in Eastern Continents
Asia
Japan
China, India, Russia, Saudi Arabia, South Korea
Africa
Rwanda, Tanzania
Egypt, Ethiopia, Kenya, Madagascar, Morocco, South Africa
Europe
-
England, Finland, France, Spain, United Kingdom
Deposits in Western Continents
North America
Canada, USA
Canada, USA
South America
Colombia
Argentina, Colombia
Deposits in Oceania Continent
Australia
-
Central Australia, Western Australia
All about Nephelinite and Cataclasite Properties
Know all about Nephelinite and Cataclasite properties here. All properties of rocks are important as they define the type of rock and its application. Nephelinite belongs to Igneous Rocks while Cataclasite belongs to Metamorphic Rocks.Texture of Nephelinite is Aphanitic whereas that of Cataclasite is Clastic. Nephelinite appears Skeletal and Cataclasite appears Dull and Banded. The luster of Nephelinite is vitreous to metallic while that of Cataclasite is vitreous. Nephelinite is available in black, brown, green, grey, white colors whereas Cataclasite is available in brown, green, white, yellow colors. The commercial uses of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo) and that of Cataclasite are commemorative tablets, creating artwork.