Picrite and Boninite
Definition
Definition
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
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
History
Origin
Hawaii Islands
Japan
Discoverer
Unknown
Unknown
Etymology
From Greek pikros bitter + -ite, 19th century
From its occurrence in the Izu-Bonin arc south of Japan
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock
Texture
Texture
Earthy, Rough
Aphanitic to Porphyritic
Color
Black, Brown, Colourless, Green, Grey, Pink, White, Yellow
Bluish - Grey, Brown, Colourless, Green, Grey
Maintenance
Less
Less
Durability
Durable
Durable
Water Resistant
Yes
No
Scratch Resistant
Yes
Yes
Stain Resistant
Yes
Yes
Wind Resistant
Yes
Yes
Acid Resistant
Yes
No
Appearance
Rough and Shiny
Dull and Soft
Uses
Architecture
Interior Uses
Countertops, Decorative Aggregates, Homes, Interior Decoration
Decorative Aggregates, Homes, Kitchens
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
Garden Decoration, Office Buildings
Other Architectural Uses
Curbing
Not Yet Used
Industry
Construction Industry
As a Sintering Agent in Steel Industry to process Iron Ore, Cement Manufacture, for Road Aggregate, Manufacture of Magnesium and Dolomite Refractories, Roadstone, Used for flooring, stair treads, borders and window sills.
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, Sculpture
Artifacts
Other Uses
Commercial Uses
As a Feed Additive for Livestock, As armour rock for sea walls, Metallurgical Flux, Pottery, Source of Magnesia (MgO)
An Oil and Gas Reservoir, Cemetery Markers, Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)
Types
Types
Oceanite
Not Available
Features
Host Rock for Lead
Available in Lots of Colors and Patterns, High Mg content, Is one of the oldest rock
Archaeological Significance
Monuments
Used
Not Yet Used
Famous Monuments
Data Not Available
Not Applicable
Sculpture
Used
Not Yet Used
Famous Sculptures
Data Not Available
Not Applicable
Pictographs
Not Used
Not Used
Petroglyphs
Not Used
Not Used
Figurines
Used
Not Yet Used
Fossils
Absent
Absent
Formation
Formation
Picrite 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.
Boninite is a type of Igneous rock which is formed through the cooling and solidification of lava or existing rocks.
Composition
Mineral Content
Biotite, Olivine, Plagioclase, Pyrrhotite
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Ilmenite
Compound Content
Al, CaO, Carbon Dioxide, Mg, MgO
Silicon Dioxide
Transformation
Metamorphism
Yes
Yes
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Impact Metamorphism, Regional Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism
Weathering
Yes
Yes
Types of Weathering
Biological Weathering
Biological Weathering
Erosion
Yes
Yes
Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion
Chemical Erosion, Coastal Erosion, Wind Erosion
Properties
Physical Properties
Hardness
6.8
7
Grain Size
Fine Grained
Fine Grained
Fracture
Uneven
Uneven
Streak
White, Greenish White or Grey
White
Porosity
Less Porous
Less Porous
Luster
Subvitreous to Dull
Vitreous
Compressive Strength
189.00 N/mm2
11
Not Available
Cleavage
Imperfect
Not Available
Toughness
2.1
1.1
Specific Gravity
2.75-2.92
2.5-2.8
Transparency
Opaque
Opaque
Density
1.5-2.5 g/cm3
Not Available
Thermal Properties
Specific Heat Capacity
0.88 kJ/Kg K
13
Not Available
Resistance
Heat Resistant
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
Reserves
Deposits in Eastern Continents
Asia
India, Russia
Not Available
Africa
South Africa
South Africa
Europe
Iceland
England, Finland, United Kingdom
Others
Not Yet Found
Antarctica, Greenland
Deposits in Western Continents
North America
Canada, USA
USA
South America
Brazil
Colombia, Uruguay
Deposits in Oceania Continent
Australia
Not Yet Found
New Zealand, Western Australia
All about Picrite and Boninite Properties
Know all about Picrite and Boninite properties here. All properties of rocks are important as they define the type of rock and its application. Picrite and Boninite belong to Igneous Rocks.Texture of Picrite is Earthy, Rough whereas that of Boninite is Aphanitic to Porphyritic. Picrite appears Rough and Shiny and Boninite appears Dull and Soft. The luster of Picrite is subvitreous to dull while that of Boninite is vitreous. Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors whereas Boninite is available in bluish - grey, brown, colourless, green, grey colors. The commercial uses of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo) and that of Boninite are an oil and gas reservoir, cemetery markers, creating artwork, soil conditioner, source of magnesia (mgo).
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