Definition
Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.
History
Origin
USA
Discoverer
Unknown
Etymology
From pseudo- + tachylite, a glassy rock generated by frictional heat within faults.
Class
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Family
Group
-
Other Categories
Fine Grained Rock, Opaque Rock
Texture
Quench
Color
Black, Brown, Green, Grey, Pink, White
Maintenance
Less
Durability
Durable
Water Resistant
✔
✘
81% - Metamorphic Rocks Rocks have it !
Scratch Resistant
✔
✘
65% - Metamorphic Rocks Rocks have it !
Stain Resistant
✔
✘
42% - Metamorphic Rocks Rocks
Wind Resistant
✔
✘
19% - Metamorphic Rocks Rocks have it !
Acid Resistant
✔
✘
15% - Metamorphic Rocks Rocks have it !
Appearance
Dull and Soft
Architecture
Interior Uses
Decorative Aggregates, Entryways, Interior Decoration
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration
Other Architectural Uses
Curbing
Industry
Construction Industry
As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement
Medical Industry
-
Antiquity Uses
Artifacts, Monuments
Other Uses
Commercial Uses
Creating Artwork, Gemstone
Types
Cataclastic rock
Features
Host Rock for Lead
Archaeological Significance
Monuments
-
Famous Monuments
-
Sculpture
-
Famous Sculptures
-
Pictographs
-
Petroglyphs
-
Figurines
-
Fossils
Absent
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.
Composition
Mineral Content
Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides
Compound Content
Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur
Transformation
Metamorphism
✔
✘
50% - Metamorphic Rocks Rocks have it !
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism
Weathering
✔
✘
65% - Metamorphic Rocks Rocks
Types of Weathering
-
Erosion
✔
✘
77% - Metamorphic Rocks Rocks
Types of Erosion
-
Physical Properties
Hardness
7
1
7
👆🏻
Grain Size
Very fine-grained
Fracture
Uneven
Streak
Light to dark brown
Porosity
Less Porous
Luster
Vitreous
Compressive Strength
60.00 N/mm2
Rank: 37 (Overall)
0.15
450
👆🏻
Cleavage
-
Toughness
-
Specific Gravity
2.46-2.86
0
8.4
👆🏻
Transparency
Transparent to Translucent
Density
2.7-2.9 g/cm3
0
1400
👆🏻
Thermal Properties
Specific Heat Capacity
0.92 kJ/Kg K
Rank: 10 (Overall)
0.14
3.2
👆🏻
Resistance
Heat Resistant
Deposits in Eastern Continents
Asia
South Korea
Africa
Western Africa
Europe
Great Britain, Switzerland
Others
-
Deposits in Western Continents
North America
-
South America
-
Deposits in Oceania Continent
Australia
Central Australia, Western Australia