Boninite and Tachylite
Definition
Definition
Boninite is a mafic extrusive rock which is high in magnesium and silica content, formed in fore-arc environments, typically during the early stages of subduction
Tachylite is a vitreous form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt
History
Origin
Japan
Iceland
Discoverer
Unknown
Unknown
Etymology
From its occurrence in the Izu-Bonin arc south of Japan
From German Tachylite, from tachy- + Greek lutos soluble, melting
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Texture
Texture
Aphanitic to Porphyritic
Vitreous
Color
Bluish - Grey, Brown, Colourless, Green, Grey
Black, Dark Brown
Maintenance
Less
More
Durability
Durable
Durable
Water Resistant
No
Yes
Scratch Resistant
Yes
No
Stain Resistant
Yes
No
Wind Resistant
Yes
Yes
Acid Resistant
No
Yes
Appearance
Dull and Soft
Glassy
Uses
Architecture
Interior Uses
Decorative Aggregates, Homes, Kitchens
Decorative Aggregates, Interior Decoration
Exterior Uses
Garden Decoration, Office Buildings
As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
Other Architectural Uses
Not Yet Used
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
Cutting Tool, Knives, Landscaping, Scrapers
Medical Industry
Not Yet Used
Not Yet Used
Antiquity Uses
Artifacts
Artifacts
Other Uses
Commercial Uses
An Oil and Gas Reservoir, Cemetery Markers, Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)
Cemetery Markers, Creating Artwork
Types
Types
Not Available
Not Available
Features
Available in Lots of Colors and Patterns, High Mg content, Is one of the oldest rock
Available in Lots of Colors and Patterns, Clasts are smooth to touch, NA
Archaeological Significance
Monuments
Not Yet Used
Not Yet Used
Famous Monuments
Not Applicable
Not Applicable
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
Fossils
Absent
Absent
Formation
Formation
Boninite is a type of Igneous rock which is formed through the cooling and solidification of lava or existing rocks.
Tachylite 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
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Ilmenite
Feldspar, Olivine
Compound Content
Silicon Dioxide
Fe, Mg
Transformation
Metamorphism
Yes
Yes
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism
Weathering
Yes
Yes
Types of Weathering
Biological Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Erosion
Yes
Yes
Types of Erosion
Chemical Erosion, Coastal Erosion, Wind Erosion
Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion
Properties
Physical Properties
Hardness
7
5.5
Grain Size
Fine Grained
Medium to Fine Coarse Grained
Fracture
Uneven
Conchoidal
Streak
White
Vermilion
Porosity
Less Porous
Less Porous
Luster
Vitreous
Resinous
Compressive Strength
Not Available
206.00 N/mm2
8
Cleavage
Not Available
Not Available
Toughness
1.1
Not Available
Specific Gravity
2.5-2.8
2.4
Transparency
Opaque
Opaque
Density
Not Available
3.058 g/cm3
Thermal Properties
Specific Heat Capacity
Not Available
0.56 kJ/Kg K
22
Resistance
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
Heat Resistant, Impact Resistant, Wear Resistant
Reserves
Deposits in Eastern Continents
Asia
Not Available
Cambodia, Russia, South Korea
Africa
South Africa
East Africa
Europe
England, Finland, United Kingdom
England, Germany, Hungary, Iceland, Scotland, Sweden
Others
Antarctica, Greenland
Hawaii Islands
Deposits in Western Continents
North America
USA
USA
South America
Colombia, Uruguay
Not Yet Found
Deposits in Oceania Continent
Australia
New Zealand, Western Australia
Victoria
All about Boninite and Tachylite Properties
Know all about Boninite and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Boninite and Tachylite belong to Igneous Rocks.Texture of Boninite is Aphanitic to Porphyritic whereas that of Tachylite is Vitreous. Boninite appears Dull and Soft and Tachylite appears Glassy. The luster of Boninite is vitreous while that of Tachylite is resinous. Boninite is available in bluish - grey, brown, colourless, green, grey colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Boninite and Tachylite are an oil and gas reservoir, cemetery markers, creating artwork, soil conditioner, source of magnesia (mgo).
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