Definition
Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.
Jaspillite is an iron rich chemically formed rock which is common in banded iron formation rocks
Origin
USA
Western Australia, Minnesota
Discoverer
Unknown
Unknown
Etymology
From pseudo- + tachylite, a glassy rock generated by frictional heat within faults.
From Jaspilite (Mineral), a compact siliceous rock which resembles jasper
Class
Metamorphic Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
Group
Not Applicable
Not Applicable
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock
Texture
Quench
Banded, Trellis
Color
Black, Brown, Colourless, Green, Grey, Pink, White
Red, Reddish Brown
Durability
Durable
Durable
Appearance
Dull and Soft
Banded and Glassy
Interior Uses
Decorative Aggregates, Entryways, Interior Decoration
Decorative Aggregates, Interior Decoration
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration
As Facing Stone, Garden Decoration, Paving Stone
Other Architectural Uses
Curbing
Curbing
Construction Industry
As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement
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
Medical Industry
Not Yet Used
Not Yet Used
Antiquity Uses
Artifacts, Monuments
Artifacts, Jewellery, Monuments
Commercial Uses
Creating Artwork, Gemstone
Creating Artwork, Jewelry
Types
Not Available
Algoma-type , Lake Superior-type and Superior-type
Features
Host Rock for Lead
Is one of the oldest rock
Archaeological Significance
Famous Monuments
Data Not Available
Data Not Available
Sculpture
Not Yet Used
Not Yet Used
Famous Sculptures
Not Applicable
Not Applicable
Pictographs
Not Used
Used
Petroglyphs
Not Used
Used
Figurines
Not Yet Used
Not Yet Used
Formation
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Pseudotachylite is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.
Jaspillite is a type of sedimentary rock which is formed by the compaction and sedimentation of pieces of broken or weathered rocks and minerals.
Mineral Content
Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides
Coesite, Quartz, Sand
Compound Content
Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur
Fe, Iron(III) Oxide, Silicon Dioxide
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism
Not Applicable
Types of Weathering
Not Applicable
Biological Weathering, Chemical Weathering
Types of Erosion
Not Applicable
Chemical Erosion, Coastal Erosion
Grain Size
Very fine-grained
Large and Coarse Grained
Fracture
Uneven
Conchoidal
Streak
Light to dark brown
White
Porosity
Less Porous
Very Less Porous
Cleavage
Irregular
Imperfect
Toughness
Not Available
Not Available
Specific Gravity
2.46-2.86
5.0-5.3
Transparency
Transparent to Translucent
Translucent to Opaque
Density
2.7-2.9 g/cm3
0-5.7 g/cm3
Resistance
Heat Resistant
Heat Resistant, Impact Resistant, Wear Resistant
Deposits in Eastern Continents
Africa
Western Africa
Not Yet Found
Europe
Great Britain, Switzerland
Ukraine
Others
Not Yet Found
Not Yet Found
Deposits in Western Continents
North America
Not Yet Found
Canada, USA
South America
Not Yet Found
Brazil
Deposits in Oceania Continent
Australia
Central Australia, Western Australia
Western Australia
All about Pseudotachylite and Jaspillite Properties
Know all about Pseudotachylite and Jaspillite properties here. All properties of rocks are important as they define the type of rock and its application. Pseudotachylite belongs to Metamorphic Rocks while Jaspillite belongs to Sedimentary Rocks.Texture of Pseudotachylite is Quench whereas that of Jaspillite is Banded, Trellis. Pseudotachylite appears Dull and Soft and Jaspillite appears Banded and Glassy. The luster of Pseudotachylite is vitreous while that of Jaspillite is earthy. Pseudotachylite is available in black, brown, colourless, green, grey, pink, white colors whereas Jaspillite is available in red, reddish brown colors. The commercial uses of Pseudotachylite are creating artwork, gemstone and that of Jaspillite are creating artwork, jewelry.