Boninite

Trondhjemite

Boninite and Trondhjemite

Boninite

Trondhjemite

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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

Trondhjemite is a leucocratic (light-colored) intrusive igneous rock. It is a variety of tonalite in which the plagioclase is mostly in the form of oligoclase. Trondhjemites are sometimes known as plagiogranites.

History

Origin

Japan

Tonale, Italy

Discoverer

Unknown

Etymology

From its occurrence in the Izu-Bonin arc south of Japan

From Trondheim, Norway

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Volcanic

Plutonic

Other Categories

Fine Grained Rock, Opaque Rock

Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Phaneritic

Color

Bluish - Grey, Brown, Green, Grey

Black, Brown, Light to Dark Grey, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Soft

Banded and Foilated

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes, Kitchens

Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration

Exterior Uses

Garden Decoration, Office Buildings

As Building Stone, As Facing Stone, Paving Stone, Garden Decoration, Office Buildings

Other Architectural Uses

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

As Dimension Stone, Cement Manufacture, Cobblestones, Construction Aggregate, for Road Aggregate

Medical Industry

Antiquity Uses

Artifacts

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

An Oil and Gas Reservoir, Cemetery Markers, Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)

Cemetery Markers, Creating Artwork

Types

Basalt

Intermediate intrusive rock

Features

Available in Lots of Colors and Patterns, High Mg content, Is one of the oldest rock

Is one of the oldest rock, Typically speckled black and white.

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Boninite is a type of Igneous rock which is formed through the cooling and solidification of lava or existing rocks.

When alkali feldspar is extracted from granite, it changes to granitoid and later, it becomes trondhjemite with quartz as major mineral.

Composition

Mineral Content

Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Ilmenite

Albite, Amphibole, Apatite, Biotite, Feldspar, Hornblade, Ilmenite, Magnetite, Manganese Oxides, Olivine, Plagioclase, Pyroxene, Quartz, Sulfides, Titanite, Zircon

Compound Content

Silicon Dioxide

NaCl, CaO, MgO, Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Wind Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

76-7

1 7

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Grain Size

Fine Grained

Medium to Fine Coarse Grained

Fracture

Uneven

Conchoidal

Streak

White

Bluish Black

Porosity

Less Porous

Very Less Porous

Luster

Vitreous

Subvitreous to Dull

Compressive Strength

150.00 N/mm²130.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

1.1

2.1

Specific Gravity

2.5-2.82.86-3

0 8.4

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Transparency

Opaque

Density

-9999 g/cm³2.73 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.84 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Africa

South Africa

Egypt

Europe

England, Finland, United Kingdom

Finland, Germany, Italy, Romania, Sweden, Turkey

Others

Antarctica, Greenland

Deposits in Western Continents

North America

USA

South America

Colombia, Uruguay

Argentina, Bolivia, Chile, Colombia, Ecuador, Peru

Deposits in Oceania Continent

Australia

New Zealand, Western Australia

New Zealand, South Australia, Western Australia

All about Boninite and Trondhjemite Properties

Know all about Boninite and Trondhjemite properties here. All properties of rocks are important as they define the type of rock and its application. Boninite and Trondhjemite belong to Igneous Rocks.Texture of Boninite is Aphanitic to Porphyritic whereas that of Trondhjemite is Phaneritic. Boninite appears Dull and Soft and Trondhjemite appears Banded and Foilated. The luster of Boninite is vitreous while that of Trondhjemite is subvitreous to dull. Boninite is available in bluish - grey, brown, green, grey colors whereas Trondhjemite is available in black, brown, light to dark grey, white colors. The commercial uses of Boninite and Trondhjemite are an oil and gas reservoir, cemetery markers, creating artwork, soil conditioner, source of magnesia (mgo).