Jaspillite and Tephrite
Definition
Definition
Jaspillite is an iron rich chemically formed rock which is common in banded iron formation rocks
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
History
Origin
Western Australia, Minnesota
Germany
Discoverer
Unknown
Van Tooren
Etymology
From Jaspilite (Mineral), a compact siliceous rock which resembles jasper
From Greek tephra, ashes from Indo-European base, to burn
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Hard Rock
Family
Group
Not Applicable
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Texture
Texture
Banded, Trellis
Aphanitic to Porphyritic
Color
Red, Reddish Brown
Black, Brown, Colourless, Green, Grey, White
Maintenance
Less
Less
Durability
Durable
Durable
Water Resistant
No
Yes
Scratch Resistant
No
Yes
Stain Resistant
No
No
Wind Resistant
No
Yes
Acid Resistant
No
No
Appearance
Banded and Glassy
Vesicular
Uses
Architecture
Interior Uses
Decorative Aggregates, Interior Decoration
Decorative Aggregates, Flooring, Homes, Interior Decoration
Exterior Uses
As Facing Stone, Garden Decoration, Paving Stone
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings
Other Architectural Uses
Curbing
Curbing
Industry
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
Landscaping
Medical Industry
Not Yet Used
Not Yet Used
Antiquity Uses
Artifacts, Jewellery, Monuments
Artifacts, Sculpture
Other Uses
Commercial Uses
Creating Artwork, Jewelry
Production of Lime, Soil Conditioner
Types
Types
Algoma-type , Lake Superior-type and Superior-type
Not Available
Features
Is one of the oldest rock
Host Rock for Lead
Archaeological Significance
Monuments
Used
Not Yet Used
Famous Monuments
Data Not Available
Not Applicable
Sculpture
Not Yet Used
Used
Famous Sculptures
Not Applicable
Data Not Available
Pictographs
Used
Not Used
Petroglyphs
Used
Not Used
Figurines
Not Yet Used
Used
Fossils
Present
Absent
Formation
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.
Tephrite 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.
Composition
Mineral Content
Coesite, Quartz, Sand
Alkali feldspar, Nepheline, Plagioclase, Pyroxene
Compound Content
Fe, Iron(III) Oxide, Silicon Dioxide
CaO, Carbon Dioxide, MgO, Silicon Dioxide
Transformation
Metamorphism
No
Yes
Types of Metamorphism
Not Applicable
Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism
Weathering
Yes
Yes
Types of Weathering
Biological Weathering, Chemical Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Erosion
Yes
Yes
Types of Erosion
Chemical Erosion, Coastal Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion
Properties
Physical Properties
Hardness
3
6.5
Grain Size
Large and Coarse Grained
Medium to Fine Coarse Grained
Fracture
Conchoidal
Uneven
Streak
White
Bluish Black
Porosity
Very Less Porous
Very Less Porous
Luster
Earthy
Subvitreous to Dull
Compressive Strength
230.00 N/mm2
6
90.00 N/mm2
22
Cleavage
Imperfect
Crenulation and Pervasive
Toughness
Not Available
2.4
Specific Gravity
5.0-5.3
2.86
Transparency
Translucent to Opaque
Opaque
Density
0-5.7 g/cm3
2.8-2.9 g/cm3
Thermal Properties
Specific Heat Capacity
3.20 kJ/Kg K
1
0.92 kJ/Kg K
10
Resistance
Heat Resistant, Impact Resistant, Wear Resistant
Heat Resistant, Impact Resistant
Reserves
Deposits in Eastern Continents
Asia
Russia
Not Yet Found
Africa
Not Yet Found
Namibia, Uganda
Europe
Ukraine
Germany, Hungary, Italy, Portugal, Spain
Others
Not Yet Found
Not Yet Found
Deposits in Western Continents
North America
Canada, USA
USA
South America
Brazil
Not Yet Found
Deposits in Oceania Continent
Australia
Western Australia
New Zealand, Western Australia
All about Jaspillite and Tephrite Properties
Know all about Jaspillite and Tephrite properties here. All properties of rocks are important as they define the type of rock and its application. Jaspillite belongs to Sedimentary Rocks while Tephrite belongs to Igneous Rocks.Texture of Jaspillite is Banded, Trellis whereas that of Tephrite is Aphanitic to Porphyritic. Jaspillite appears Banded and Glassy and Tephrite appears Vesicular. The luster of Jaspillite is earthy while that of Tephrite is subvitreous to dull. Jaspillite is available in red, reddish brown colors whereas Tephrite is available in black, brown, colourless, green, grey, white colors. The commercial uses of Jaspillite are creating artwork, jewelry and that of Tephrite are production of lime, soil conditioner.
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