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Rhyolite
Rhyolite

Pseudotachylite
Pseudotachylite



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Rhyolite
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Pseudotachylite

Rhyolite vs Pseudotachylite

Definition

Definition

Rhyolite is a fine-grained igneous rock which is rich in silica
Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.

History

Origin

North America
USA

Discoverer

Ferdinand von Richthofen
Unknown

Etymology

From German Rhyolit, from Greek rhuax lava stream + lithos stone
From pseudo- +‎ tachylite, a glassy rock generated by frictional heat within faults.

Class

Igneous Rocks
Metamorphic Rocks

Sub-Class

Durable Rock, Hard Rock
Durable Rock, Hard Rock

Family

Group

Volcanic
-

Other Categories

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

Texture

Texture

Aphanitic, Glassy, Porphyritic
Quench

Color

Grey, White, Light Black
Black, Brown, Green, Grey, Pink, White

Maintenance

More
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Banded
Dull and Soft

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes, Hotels, Interior Decoration, Kitchens
Decorative Aggregates, Entryways, Interior Decoration

Exterior Uses

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

Other Architectural Uses

-
Curbing

Industry

Construction Industry

Arrowheads, As Dimension Stone, Building houses or walls, Construction Aggregate, Cutting Tool, for Road Aggregate, Knives
As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement

Medical Industry

-
-

Antiquity Uses

Artifacts
Artifacts, Monuments

Other Uses

Commercial Uses

Gemstone, Laboratory bench tops, Jewelry
Creating Artwork, Gemstone

Types

Types

Pumice Rocks, Obsidian Rocks, Perlite Rocks, Porphyritic Rocks.
Cataclastic rock

Features

Acidic in nature, Available in lots of colors
Host Rock for Lead

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Absent

Formation

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

Composition

Mineral Content

Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz
Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides

Compound Content

Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon Dioxide, Sodium
Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur

Transformation

Metamorphism

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Weathering

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering
-

Erosion

Types of Erosion

Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion
-

Properties

Physical Properties

Hardness

6-77
1 7
👆🏻

Grain Size

Large and Coarse Grained
Very fine-grained

Fracture

Sub-conchoidal
Uneven

Streak

-
Light to dark brown

Porosity

Highly Porous
Less Porous

Luster

Earthy
Vitreous

Compressive Strength

140.00 N/mm260.00 N/mm2
0.15 450
👆🏻

Cleavage

-
-

Toughness

2
-

Specific Gravity

2.65-2.672.46-2.86
0 8.4
👆🏻

Transparency

Opaque
Transparent to Translucent

Density

2.4-2.6 g/cm32.7-2.9 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

0.71 kJ/Kg K0.92 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant, Wear Resistant
Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India
South Korea

Africa

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

Europe

Germany, Iceland, Ireland, Italy, Spain
Great Britain, Switzerland

Others

-
-

Deposits in Western Continents

North America

Canada, USA
-

South America

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

Deposits in Oceania Continent

Australia

New Zealand, Queensland, Western Australia
Central Australia, Western Australia

Rhyolite vs Pseudotachylite Information

Earth’s outer layer is covered by rocks and these rocks have different physical and chemical properties. As two rocks are not same, it’s fun to compare them. You can also know more about Rhyolite and Pseudotachylite Reserves. Rhyolite is a fine-grained igneous rock which is rich in silica. Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.. These rocks are composed of many distinct minerals. The process of formation of rocks is different for various rocks. Rocks are quarried from many years for various purposes. You can check out Rhyolite vs Pseudotachylite information and Rhyolite vs Pseudotachylite characteristics in the upcoming sections.

Rhyolite vs Pseudotachylite Characteristics

Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Rhyolite vs Pseudotachylite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Rhyolite and Properties of Pseudotachylite. Learn more about Rhyolite vs Pseudotachylite in the next section. The interior uses of Rhyolite include Decorative aggregates, Homes, Hotels, Interior decoration and Kitchens whereas the interior uses of Pseudotachylite include Decorative aggregates, Entryways and Interior decoration. Due to some exceptional properties of Rhyolite and Pseudotachylite, they have various applications in construction industry. The uses of Rhyolite in construction industry include Arrowheads, As dimension stone, Building houses or walls, Construction aggregate, Cutting tool, For road aggregate, Knives and that of Pseudotachylite include As dimension stone, Cement manufacture, For road aggregate, Making natural cement.

More about Rhyolite and Pseudotachylite

Here you can know more about Rhyolite and Pseudotachylite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Rhyolite and Pseudotachylite consists of mineral content and compound content. The mineral content of Rhyolite includes Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz and mineral content of Pseudotachylite includes Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides. You can also check out the list of all Igneous Rocks. When we have to compare Rhyolite vs Pseudotachylite, the texture, color and appearance plays an important role in determining the type of rock. Rhyolite is available in grey, white, light black colors whereas, Pseudotachylite is available in black, brown, green, grey, pink, white colors. Appearance of Rhyolite is Banded and that of Pseudotachylite is Dull and Soft. Properties of rock is another aspect for Rhyolite vs Pseudotachylite. The hardness of Rhyolite is 6-7 and that of Pseudotachylite is 7. The types of Rhyolite are Pumice Rocks, Obsidian Rocks, Perlite Rocks, Porphyritic Rocks. whereas types of Pseudotachylite are Cataclastic rock. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Rhyolite is while that of Pseudotachylite is light to dark brown. The specific heat capacity of Rhyolite is 0.71 kJ/Kg K and that of Pseudotachylite is 0.92 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Rhyolite is heat resistant, wear resistant whereas Pseudotachylite is heat resistant.