Definition
Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite).
Oolite is a sedimentary rock formed from ooids, spherical grains which are composed of concentric layers of calcite
Discoverer
Unknown
William Smith
Etymology
from French néphéline, from Greek nephelē
From oo- + -lite, after German Oolit. A rock consisting of fine grains of carbonate of lime
Class
Igneous Rocks
Sedimentary 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 or Non-Clastic
Color
Black, Brown, Green, Grey, White
Black, Blue, Brown, Cream, Green, Grey, Pink, Red, Silver, White, Yellow
Durability
Durable
Durable
Scratch Resistant
Yes
Yes
Appearance
Skeletal
Rounded and Rough
Interior Uses
Decorative Aggregates, Homes, Interior Decoration
Decorative Aggregates, Flooring, Interior Decoration
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
Other Architectural Uses
Curbing
-
Construction Industry
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate
Cement Manufacture, Cobblestones, Landscaping
Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines
Artifacts
Commercial Uses
Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)
Creating Artwork, Jewelry, Used in aquariums
Types
Peralkaline Nephelinite
Pisolitic Oolite and Oncolitic Oolite
Features
Host Rock for Lead
Available in lots of colors, Generally rough to touch, Very fine grained 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.
Oolites form when layers of calcite are deposited around a sand grain or fossil piece and are rolled around in calm water, which makes them round.
Mineral Content
Clinopyroxene, Nepheline, Plagioclase
Calcite, Chert, Clay, Dolomite, Quartz, Sand, Silt
Compound Content
Ca, CaO, Carbon, Cl, MgO
Aluminium Oxide, Ca, NaCl, CaO, Iron(III) Oxide, FeO, MgO
Types of Metamorphism
Contact Metamorphism
-
Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Types of Erosion
Chemical Erosion, Water Erosion, Wind Erosion
Chemical Erosion, Coastal Erosion
Grain Size
Fine Grained
Fine Grained
Porosity
Less Porous
Less Porous
Luster
Vitreous to Metallic
Pearly to Shiny
Specific Gravity
2.4-2.9
-9999
Transparency
Opaque
Opaque
Density
2.5-3 g/cm3
-9999 g/cm3
Resistance
Heat Resistant
Heat Resistant, Wear Resistant
Deposits in Eastern Continents
Asia
Japan
Brunei, India, Indonesia, Malaysia, Singapore, Thailand, Vietnam
Africa
Rwanda, Tanzania
Cameroon, Chad, Ghana, Kenya, Malawi, Sudan, Tanzania, Togo, Zambia, Zimbabwe
Deposits in Western Continents
North America
Canada, USA
USA
South America
Colombia
Colombia
Deposits in Oceania Continent
Australia
-
Adelaide, New Zealand, Queensland, Victoria, Yorke Peninsula
All about Nephelinite and Oolite Properties
Know all about Nephelinite and Oolite properties here. All properties of rocks are important as they define the type of rock and its application. Nephelinite belongs to Igneous Rocks while Oolite belongs to Sedimentary Rocks.Texture of Nephelinite is Aphanitic whereas that of Oolite is Clastic or Non-Clastic. Nephelinite appears Skeletal and Oolite appears Rounded and Rough. The luster of Nephelinite is vitreous to metallic while that of Oolite is pearly to shiny. Nephelinite is available in black, brown, green, grey, white colors whereas Oolite is available in black, blue, brown, cream, green, grey, pink, red, silver, white, yellow colors. The commercial uses of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo) and that of Oolite are creating artwork, jewelry, used in aquariums.