Rhyolite

Adakite

Rhyolite and Adakite

Rhyolite

Adakite

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1 Definition

1.1 Definition

Rhyolite is a fine-grained igneous rock which is rich in silica

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

1.2 History

1.2.1 Origin

North America

Adak, Aleutian Islands

1.2.2 Discoverer

Ferdinand von Richthofen

Defant and Drummond

1.3 Etymology

From German Rhyolit, from Greek rhuax lava stream + lithos stone

From Adak, Aleutian Islands

1.4 Class

Igneous Rocks

1.4.1 Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

1.5 Family

1.5.1 Group

Volcanic

1.6 Other Categories

Coarse Grained Rock, Opaque Rock

Fine Grained Rock, Medium Grained Rock, Opaque Rock

2 Texture

2.1 Texture

Aphanitic, Glassy, Porphyritic

Porphyritic

2.2 Color

Grey, White, Light Black

Black, Brown, Light to Dark Grey

2.3 Maintenance

Less

2.4 Durability

Durable

2.4.1 Water Resistant

✔ ✘

2.4.2 Scratch Resistant

✔ ✘

2.4.3 Stain Resistant

✔ ✘

2.4.4 Wind Resistant

✔ ✘

2.4.5 Acid Resistant

✔ ✘

2.5 Appearance

Banded

Dull and Soft

3 Uses

3.1 Architecture

3.1.1 Interior Uses

Decorative Aggregates, Homes, Hotels, Interior Decoration, Kitchens

Decorative Aggregates, Floor Tiles, Homes, Hotels, Kitchens

3.1.2 Exterior Uses

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

As Building Stone, As Facing Stone, Office Buildings

3.1.3 Other Architectural Uses

Not Yet Used

Whetstones

3.2 Industry

3.2.1 Construction Industry

Arrowheads, As Dimension Stone, Building houses or walls, Construction Aggregate, Cutting Tool, for Road Aggregate, Knives

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

3.2.2 Medical Industry

Not Yet Used

3.3 Antiquity Uses

Artifacts

Monuments, Sculpture, Small Figurines

3.4 Other Uses

3.4.1 Commercial Uses

Gemstone, Laboratory bench tops, Jewelry

Commemorative Tablets, Pottery, Used in aquariums

4 Types

4.1 Types

Pumice Rocks, Obsidian Rocks, Perlite Rocks, Porphyritic Rocks.

Not Available

4.2 Features

Acidic in nature, Available in lots of colors

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

4.3 Archaeological Significance

4.3.1 Monuments

Not Yet Used

Used

4.3.2 Famous Monuments

Not Applicable

Data Not Available

4.3.3 Sculpture

Not Yet Used

Used

4.3.4 Famous Sculptures

Not Applicable

Data Not Available

4.3.5 Pictographs

Not Used

Used

4.3.6 Petroglyphs

Not Used

Used

4.3.7 Figurines

Not Yet Used

Used

4.4 Fossils

Absent

5 Formation

5.1 Formation

Rhyolite is a felsic extrusive rock and due to its high silica content, rhyolite lava is very viscous and is volcanic equivalent of granite.

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.

5.2 Composition

5.2.1 Mineral Content

Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz

Olivine, Plagioclase, Pyroxene

5.2.2 Compound Content

Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon Dioxide, Sodium

Aluminium Oxide, MgO, Silicon Dioxide

5.3 Transformation

5.3.1 Metamorphism

✔ ✘

5.3.2 Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

5.3.3 Weathering

✔ ✘

5.3.4 Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Chemical Weathering, Mechanical Weathering

5.3.5 Erosion

✔ ✘

5.3.6 Types of Erosion

Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion

Coastal Erosion, Sea Erosion, Water Erosion

6 Properties

6.1 Physical Properties

6.1.1 Hardness

6-73-4

1 7

6.1.2 Grain Size

Large and Coarse Grained

Fine to Medium Grained

6.1.3 Fracture

Sub-conchoidal

Conchoidal

6.1.4 Streak

Colorless

Bluish Black

6.1.5 Porosity

Highly Porous

Less Porous

6.1.6 Luster

Earthy

Grainy, Pearly and Vitreous

6.1.7 Compressive Strength

140.00 N/mm²NA

0.15 450

6.1.8 Cleavage

Not Available

6.1.9 Toughness

Not Available

6.1.10 Specific Gravity

2.65-2.67Not Available

0 8.4

6.1.11 Transparency

Opaque

6.1.12 Density

2.4-2.6 g/cm³Not Available

0 1400

6.2 Thermal Properties

6.2.1 Specific Heat Capacity

NANA

0.14 3.2

6.2.2 Resistance

Heat Resistant, Wear Resistant

Heat Resistant, Pressure Resistant, Wear Resistant

7 Reserves

7.1 Deposits in Eastern Continents

7.1.1 Asia

China, India

India, Russia

7.1.2 Africa

Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa

Ethiopia, Somalia, South Africa

7.1.3 Europe

Germany, Iceland, Ireland, Italy, Spain

Iceland

7.1.4 Others

Not Yet Found

7.2 Deposits in Western Continents

7.2.1 North America

Canada, USA

7.2.2 South America

Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela

Brazil

7.3 Deposits in Oceania Continent

7.3.1 Australia

New Zealand, Queensland, Western Australia

Not Yet Found

All about Rhyolite and Adakite Properties

Know all about Rhyolite and Adakite properties here. All properties of rocks are important as they define the type of rock and its application. Rhyolite and Adakite belong to Igneous Rocks.Texture of Rhyolite is Aphanitic, Glassy, Porphyritic whereas that of Adakite is Porphyritic. Rhyolite appears Banded and Adakite appears Dull and Soft. The luster of Rhyolite is earthy while that of Adakite is grainy, pearly and vitreous. Rhyolite is available in grey, white, light black colors whereas Adakite is available in black, brown, light to dark grey colors. The commercial uses of Rhyolite are gemstone, laboratory bench tops, jewelry and that of Adakite are commemorative tablets, pottery, used in aquariums.