Adakite

Metapelite

Adakite and Metapelite

Adakite

Metapelite

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Definition

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

Metapelite is an old and currently not widely used field geological term for a clay rich fine-grained clastic sediment or sedimentary rock, i.e. mud or a mudstone

History

Origin

Adak, Aleutian Islands

Discoverer

Defant and Drummond

Unknown

Etymology

From Adak, Aleutian Islands

From Pelos or clay in Greek

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Medium Grained Rock, Opaque Rock

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

Texture

Porphyritic

Foliated

Color

Black, Brown, Light to Dark Grey

Dark Greenish - Grey, Green, Light Green, Light Greenish Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Soft

Banded

Uses

Architecture

Interior Uses

Decorative Aggregates, Floor Tiles, Homes, Hotels, Kitchens

Decorative Aggregates, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Office Buildings

As Building Stone, As Facing Stone

Other Architectural Uses

Whetstones

Curbing

Industry

Construction Industry

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

Cement Manufacture, Construction Aggregate, for Road Aggregate

Medical Industry

Antiquity Uses

Monuments, Sculpture, Small Figurines

Artifacts

Other Uses

Commercial Uses

Commemorative Tablets, Pottery, Used in aquariums

Commemorative Tablets, Creating Artwork

Types

Intermediate volcanic rock

Metamorphic rock

Features

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

Easily splits into thin plates, It is One of the Oldest, Strongest and Hardest Rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

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.

Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Metapelite is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.

Composition

Mineral Content

Olivine, Plagioclase, Pyroxene

Albite, Chlorite, Quartz

Compound Content

Aluminium Oxide, MgO, Silicon Dioxide

Aluminium Oxide, CaO, MgO

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Chemical Weathering, Mechanical Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion, Sea Erosion, Water Erosion

Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

3-45-6

1 7

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Grain Size

Fine to Medium Grained

Medium to Fine Coarse Grained

Fracture

Conchoidal

Fibrous

Streak

Bluish Black

Porosity

Less Porous

Highly Porous

Luster

Grainy, Pearly and Vitreous

Earthy

Compressive Strength

200.00 N/mm²40.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

Specific Gravity

-99993.4-3.7

0 8.4

👆🏻

Transparency

Opaque

Density

-9999 g/cm³0-300 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.84 kJ/Kg K0.72 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia

Africa

Ethiopia, Somalia, South Africa

Western Africa

Europe

Iceland

United Kingdom

Others

Deposits in Western Continents

North America

Canada, USA

South America

Brazil

Brazil, Colombia, Ecuador

Deposits in Oceania Continent

Australia

Central Australia, Western Australia

All about Adakite and Metapelite Properties

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