Adakite

Shale

Adakite and Shale

Adakite

Shale

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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

Shale is a fine-grained sedimentary rock which is formed by the compaction of silt and clay-size mineral particles

History

Origin

Adak, Aleutian Islands

Discoverer

Defant and Drummond

Johann Gottlob Lehmann

Etymology

From Adak, Aleutian Islands

From German Schalstein laminated limestone, and Schalgebirge layer of stone in stratified rock. From Old English scealu in its base sense of- thing that divides or separate,

Class

Igneous Rocks

Sedimentary Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Fine Grained Rock, Opaque Rock

Texture

Porphyritic

Clastic, Splintery

Color

Black, Brown, Light to Dark Grey

Black, Brown, Buff, Green, Grey, Red, Yellow

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Soft

Muddy

Uses

Architecture

Interior Uses

Decorative Aggregates, Floor Tiles, Homes, Hotels, Kitchens

Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Office Buildings

Other Architectural Uses

Whetstones

Curbing

Industry

Construction Industry

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar

Medical Industry

Antiquity Uses

Monuments, Sculpture, Small Figurines

Artifacts, Sculpture

Other Uses

Commercial Uses

Commemorative Tablets, Pottery, Used in aquariums

Creating Artwork, Pottery

Types

Intermediate volcanic rock

Red Shale, Black Shale, Green Shale, Grey Shale and Yellow Shale

Features

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

Easily splits into thin plates, Generally rough to touch, Very fine grained rock

Archaeological Significance

Monuments

Famous Monuments

Jantar Mantar in India

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Present

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.

Shale forms when very fine-grained clay particles are deposited in water which settle at the bottom of water bodies. They are later compacted hence forming shale.

Composition

Mineral Content

Olivine, Plagioclase, Pyroxene

Albite, Biotite, Calcite, Chert, Chlorite, Dolomite, Hematite, Micas, Muscovite or Illite, Pyrite, Quartz, Silica, Sulfides

Compound Content

Aluminium Oxide, MgO, Silicon Dioxide

Ca, Fe, Mg, Silicon Dioxide, Sodium

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, Glacier Erosion

Properties

Physical Properties

Hardness

3-43

1 7

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Grain Size

Fine to Medium Grained

Very fine-grained

Fracture

Conchoidal

Streak

Bluish Black

White

Porosity

Less Porous

Highly Porous

Luster

Grainy, Pearly and Vitreous

Dull

Compressive Strength

200.00 N/mm²95.00 N/mm²

0.15 450

👆🏻

Cleavage

Slaty

Toughness

2.6

Specific Gravity

-99992.2-2.8

0 8.4

👆🏻

Transparency

Opaque

Density

-9999 g/cm³2.4-2.8 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.84 kJ/Kg K0.39 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia

Bangladesh, China, India, Russia

Africa

Ethiopia, Somalia, South Africa

Ethiopia, Kenya, Morocco, South Africa, Tanzania

Europe

Iceland

Austria, France, Germany, Greece, Italy, Romania, Scotland, Spain, Switzerland

Others

Deposits in Western Continents

North America

Canada, USA

USA

South America

Brazil

Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela

Deposits in Oceania Continent

Australia

New South Wales, New Zealand, Queensland, Victoria, Western Australia

All about Adakite and Shale Properties

Know all about Adakite and Shale properties here. All properties of rocks are important as they define the type of rock and its application. Adakite belongs to Igneous Rocks while Shale belongs to Sedimentary Rocks.Texture of Adakite is Porphyritic whereas that of Shale is Clastic, Splintery. Adakite appears Dull and Soft and Shale appears Muddy. The luster of Adakite is grainy, pearly and vitreous while that of Shale is dull. Adakite is available in black, brown, light to dark grey colors whereas Shale is available in black, brown, buff, green, grey, red, yellow colors. The commercial uses of Adakite are commemorative tablets, pottery, used in aquariums and that of Shale are creating artwork, pottery.