Mylonite

Adakite

Mylonite and Adakite

Mylonite

Adakite

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Definition

Mylonite is a metamorphic rock formed by ductile deformation during intense shearing encountered during folding and faulting, a process termed cataclastic or dynamic metamorphism

Adakite is an intermediate to felsic volcanic rock that has geochemical characteristics of magma which is said to be formed by partial melting of altered basalt that is subducted below volcanic arcs

History

Origin

New Zealand

Adak, Aleutian Islands

Discoverer

Unknown

Defant and Drummond

Etymology

From Greek mulōn mill + -ite

From Adak, Aleutian Islands

Class

Metamorphic Rocks

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Foliated

Porphyritic

Color

Black to Grey

Black, Brown, Light to Dark Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull, Banded and Foilated

Dull and Soft

Uses

Architecture

Interior Uses

Decorative Aggregates, Interior Decoration

Decorative Aggregates, Floor Tiles, Homes, Hotels, Kitchens

Exterior Uses

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

As Building Stone, As Facing Stone, Office Buildings

Other Architectural Uses

Curbing

Whetstones

Industry

Construction Industry

for Road Aggregate, Landscaping, Roadstone

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

Medical Industry

Antiquity Uses

Artifacts, Monuments

Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Creating Artwork, Gemstone, Jewelry

Commemorative Tablets, Pottery, Used in aquariums

Types

Blastomylonites, Ultramylonites and Phyllonites

Intermediate volcanic rock

Features

Surfaces are often shiny

Has High structural resistance against erosion and climate, Host rock for Diamond, Very fine grained rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Mylonites are ductilely deformed rocks formed by the accumulation of large shear strain, in ductile fault zones.

Adakite rocks are formed when the hydrous fluids are released from minerals that break down in metamorphosed basalt, and rise into the mantle they initiate partial melting.

Composition

Mineral Content

Porphyroblasts

Olivine, Plagioclase, Pyroxene

Compound Content

Aluminium Oxide, Calcium Sulfate, Chromium(III) Oxide, Iron(III) Oxide, Magnesium Carbonate, Silicon Dioxide

Aluminium Oxide, MgO, Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Sea Erosion, Wind Erosion

Coastal Erosion, Sea Erosion, Water Erosion

Properties

Physical Properties

Hardness

3-43-4

1 7

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Grain Size

Fine Grained

Fine to Medium Grained

Fracture

Conchoidal

Streak

White

Bluish Black

Porosity

Highly Porous

Less Porous

Luster

Shiny

Grainy, Pearly and Vitreous

Compressive Strength

1.28 N/mm²200.00 N/mm²

0.15 450

👆🏻

Cleavage

Conchoidal

Toughness

Specific Gravity

2.97-3.05-9999

0 8.4

👆🏻

Transparency

Opaque

Density

2.6-4.8 g/cm³-9999 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

1.50 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Indonesia, Saudi Arabia, South Korea

India, Russia

Africa

Eritrea, Ethiopia, Ghana, South Africa, Western Africa

Ethiopia, Somalia, South Africa

Europe

England, Finland, France, Germany, Great Britain, Greece, United Kingdom

Iceland

Others

Deposits in Western Continents

North America

USA

Canada, USA

South America

Brazil

Deposits in Oceania Continent

Australia

Central Australia, Western Australia

All about Mylonite and Adakite Properties

Know all about Mylonite and Adakite properties here. All properties of rocks are important as they define the type of rock and its application. Mylonite belongs to Metamorphic Rocks while Adakite belongs to Igneous Rocks.Texture of Mylonite is Foliated whereas that of Adakite is Porphyritic. Mylonite appears Dull, Banded and Foilated and Adakite appears Dull and Soft. The luster of Mylonite is shiny while that of Adakite is grainy, pearly and vitreous. Mylonite is available in black to grey colors whereas Adakite is available in black, brown, light to dark grey colors. The commercial uses of Mylonite are creating artwork, gemstone, jewelry and that of Adakite are commemorative tablets, pottery, used in aquariums.