Definition
Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite).
Pantellerite is a peralkaline rhyolite. It has a higher iron and lower aluminium composition than comendite
Origin
Brazil
Strait of sicily
Discoverer
Unknown
Unknown
Etymology
from French néphéline, from Greek nephelē
From Pantelleria, a volcanic island in the Strait of Sicily
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock
Texture
Aphanitic
Eutaxitic
Color
Black, Brown, Colourless, Green, Grey, White
Dark Greenish - Grey
Durability
Durable
Durable
Scratch Resistant
Yes
Yes
Appearance
Skeletal
Layered and Foliated
Interior Uses
Decorative Aggregates, Homes, Interior Decoration
Not Yet Used
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
Not Yet Used
Other Architectural Uses
Curbing
Not Yet Used
Construction Industry
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate
NA
Medical Industry
Not Yet Used
Not Yet Used
Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines
Artifacts, Sculpture
Commercial Uses
Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)
Creating Artwork
Types
Peralkaline Nephelinite
Pantelleritic Ignimbrite
Features
Host Rock for Lead
High Fe content
Archaeological Significance
Monuments
Used
Not Yet Used
Famous Monuments
Data Not Available
Not Applicable
Sculpture
Used
Not Yet Used
Famous Sculptures
Data Not Available
Not Applicable
Pictographs
Not Used
Not Used
Petroglyphs
Not Used
Not Used
Figurines
Used
Not Yet Used
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.
Pantellerite 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.
Mineral Content
Clinopyroxene, Nepheline, Plagioclase
Amphibole, Feldspar, Ilmenite
Compound Content
Ca, CaO, Carbon, Cl, MgO
Al, Fe
Types of Metamorphism
Contact Metamorphism
Burial Metamorphism, Cataclastic Metamorphism
Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Biological Weathering, Chemical Weathering
Types of Erosion
Chemical Erosion, Water Erosion, Wind Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion
Grain Size
Fine Grained
Fine Grained
Fracture
Flat
Sub-conchoidal
Porosity
Less Porous
Less Porous
Luster
Vitreous to Metallic
Earthy
Compressive Strength
Not Available
Cleavage
Imperfect
Conchoidal
Specific Gravity
2.4-2.9
Not Available
Transparency
Opaque
Translucent to Opaque
Density
2.5-3 g/cm3
Not Available
Specific Heat Capacity
Not Available
Resistance
Heat Resistant
Heat Resistant
Deposits in Eastern Continents
Africa
Rwanda, Tanzania
Angola, Egypt, Madagascar, Namibia, Nigeria
Europe
Not Yet Found
Germany, Iceland, Ireland, Italy, Spain, United Kingdom
Others
Hawaii Islands
Not Yet Found
Deposits in Western Continents
North America
Canada, USA
Canada, USA
South America
Colombia
Argentina, Bolivia, Brazil, Colombia, Ecuador
Deposits in Oceania Continent
Australia
Not Yet Found
Central Australia, Queensland, Western Australia
All about Nephelinite and Pantellerite Properties
Know all about Nephelinite and Pantellerite properties here. All properties of rocks are important as they define the type of rock and its application. Nephelinite and Pantellerite belong to Igneous Rocks.Texture of Nephelinite is Aphanitic whereas that of Pantellerite is Eutaxitic. Nephelinite appears Skeletal and Pantellerite appears Layered and Foliated. The luster of Nephelinite is vitreous to metallic while that of Pantellerite is earthy. Nephelinite is available in black, brown, colourless, green, grey, white colors whereas Pantellerite is available in dark greenish - grey colors. The commercial uses of Nephelinite and Pantellerite are creating artwork, soil conditioner, source of magnesia (mgo).