Definition
Jaspillite is an iron rich chemically formed rock which is common in banded iron formation rocks
Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite).
Origin
Western Australia, Minnesota
Brazil
Discoverer
Unknown
Unknown
Etymology
From Jaspilite (Mineral), a compact siliceous rock which resembles jasper
from French néphéline, from Greek nephelē
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Hard Rock
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock
Texture
Banded, Trellis
Aphanitic
Color
Red, Reddish Brown
Black, Brown, Green, Grey, White
Durability
Durable
Durable
Appearance
Banded and Glassy
Skeletal
Interior Uses
Decorative Aggregates, Interior Decoration
Decorative Aggregates, Homes, Interior Decoration
Exterior Uses
As Facing Stone, Garden Decoration, Paving Stone
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
Other Architectural Uses
Curbing
Curbing
Construction Industry
As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement, Manufacture of Magnesium and Dolomite Refractories
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate
Antiquity Uses
Artifacts, Jewellery, Monuments
Artifacts, Monuments, Sculpture, Small Figurines
Commercial Uses
Creating Artwork, Jewelry
Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)
Types
Algoma-type , Lake Superior-type and Superior-type
Peralkaline Nephelinite
Features
Is one of the oldest rock
Host Rock for Lead
Archaeological Significance
Formation
Jaspillite is a type of sedimentary rock which is formed by the compaction and sedimentation of pieces of broken or weathered rocks and minerals.
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.
Mineral Content
Coesite, Quartz, Sand
Clinopyroxene, Nepheline, Plagioclase
Compound Content
Fe, Iron(III) Oxide, Silicon Dioxide
Ca, CaO, Carbon, Cl, MgO
Types of Metamorphism
-
Contact Metamorphism
Types of Weathering
Biological Weathering, Chemical Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Types of Erosion
Chemical Erosion, Coastal Erosion
Chemical Erosion, Water Erosion, Wind Erosion
Grain Size
Large and Coarse Grained
Fine Grained
Porosity
Very Less Porous
Less Porous
Luster
Earthy
Vitreous to Metallic
Specific Gravity
5.0-5.3
2.4-2.9
Transparency
Translucent to Opaque
Opaque
Density
0-5.7 g/cm3
2.5-3 g/cm3
Resistance
Heat Resistant, Impact Resistant, Wear Resistant
Heat Resistant
Deposits in Eastern Continents
Africa
-
Rwanda, Tanzania
Deposits in Western Continents
North America
Canada, USA
Canada, USA
South America
Brazil
Colombia
Deposits in Oceania Continent
Australia
Western Australia
-
All about Jaspillite and Nephelinite Properties
Know all about Jaspillite and Nephelinite properties here. All properties of rocks are important as they define the type of rock and its application. Jaspillite belongs to Sedimentary Rocks while Nephelinite belongs to Igneous Rocks.Texture of Jaspillite is Banded, Trellis whereas that of Nephelinite is Aphanitic. Jaspillite appears Banded and Glassy and Nephelinite appears Skeletal. The luster of Jaspillite is earthy while that of Nephelinite is vitreous to metallic. Jaspillite is available in red, reddish brown colors whereas Nephelinite is available in black, brown, green, grey, white colors. The commercial uses of Jaspillite are creating artwork, jewelry and that of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo).