Adakite

Tachylite

Adakite and Tachylite

Adakite

Tachylite

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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

Tachylite is a vitreous form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt

History

Origin

Adak, Aleutian Islands

Iceland

Discoverer

Defant and Drummond

Unknown

Etymology

From Adak, Aleutian Islands

From German Tachylite, from tachy- + Greek lutos soluble, melting

Class

Igneous 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

Vitreous

Color

Black, Brown, Light to Dark Grey

Black, Dark Brown

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Soft

Glassy

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, Garden Decoration, Paving Stone

Other Architectural Uses

Whetstones

Curbing

Industry

Construction Industry

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

Cutting Tool, Knives, Landscaping, Scrapers

Medical Industry

Antiquity Uses

Monuments, Sculpture, Small Figurines

Artifacts

Other Uses

Commercial Uses

Commemorative Tablets, Pottery, Used in aquariums

Cemetery Markers, Creating Artwork

Types

Intermediate volcanic rock

Volcanic glass

Features

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

Available in Lots of Colors and Patterns, Clasts are smooth to touch

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.

Tachylite 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.

Composition

Mineral Content

Olivine, Plagioclase, Pyroxene

Feldspar, Olivine

Compound Content

Aluminium Oxide, MgO, Silicon Dioxide

Fe, Mg

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal 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, Sea Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

3-45.5

1 7

👆🏻

Grain Size

Fine to Medium Grained

Medium to Fine Coarse Grained

Fracture

Conchoidal

Streak

Bluish Black

Vermilion

Porosity

Less Porous

Luster

Grainy, Pearly and Vitreous

Resinous

Compressive Strength

200.00 N/mm²206.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

Specific Gravity

-99992.4

0 8.4

👆🏻

Transparency

Opaque

Density

-9999 g/cm³3.058 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.84 kJ/Kg K0.56 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Impact Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia

Cambodia, Russia, South Korea

Africa

Ethiopia, Somalia, South Africa

East Africa

Europe

Iceland

England, Germany, Hungary, Iceland, Scotland, Sweden

Others

Hawaii Islands

Deposits in Western Continents

North America

Canada, USA

USA

South America

Brazil

Deposits in Oceania Continent

Australia

Victoria

All about Adakite and Tachylite Properties

Know all about Adakite and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Adakite and Tachylite belong to Igneous Rocks.Texture of Adakite is Porphyritic whereas that of Tachylite is Vitreous. Adakite appears Dull and Soft and Tachylite appears Glassy. The luster of Adakite is grainy, pearly and vitreous while that of Tachylite is resinous. Adakite is available in black, brown, light to dark grey colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Adakite are commemorative tablets, pottery, used in aquariums and that of Tachylite are cemetery markers, creating artwork.