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Obsidian
Obsidian

Pseudotachylite
Pseudotachylite



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Obsidian vs Pseudotachylite

Definition

Definition

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth
Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.

History

Origin

Ethiopia
USA

Discoverer

Obsius
Unknown

Etymology

From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius
From pseudo- +‎ tachylite, a glassy rock generated by frictional heat within faults.

Class

Igneous Rocks
Metamorphic Rocks

Sub-Class

Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock

Family

Group

Volcanic
-

Other Categories

Opaque Rock
Fine Grained Rock, Opaque Rock

Texture

Texture

Glassy
Quench

Color

Black, Blue, Brown, Green, Orange, Red, Tan, Yellow
Black, Brown, Green, Grey, Pink, White

Maintenance

Less
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Shiny
Dull and Soft

Uses

Architecture

Interior Uses

Decorative Aggregates, Interior Decoration
Decorative Aggregates, Entryways, Interior Decoration

Exterior Uses

Garden Decoration
As Building Stone, As Facing Stone, Garden Decoration

Other Architectural Uses

-
Curbing

Industry

Construction Industry

Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points
As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement

Medical Industry

Surgery
-

Antiquity Uses

Artifacts, Jewellery
Artifacts, Monuments

Other Uses

Commercial Uses

Creating Artwork, Mirror, Used in aquariums
Creating Artwork, Gemstone

Types

Types

Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian
Cataclastic rock

Features

Blocks negativity, Helps to protect against depression
Host Rock for Lead

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Absent

Formation

Formation

When the lava is released from volcano, it undergoes a very rapid cooling which freezes the mechanisms of crystallization. The result is a volcanic glass with a uniform smooth texture.
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

-
Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides

Compound Content

Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide
Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur

Transformation

Metamorphism

Types of Metamorphism

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

Weathering

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering
-

Erosion

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion
-

Properties

Physical Properties

Hardness

5-5.57
1 7
👆🏻

Grain Size

-
Very fine-grained

Fracture

Conchoidal
Uneven

Streak

White
Light to dark brown

Porosity

Very Less Porous
Less Porous

Luster

Vitreous
Vitreous

Compressive Strength

0.15 N/mm260.00 N/mm2
0.15 450
👆🏻

Cleavage

-
-

Toughness

-
-

Specific Gravity

2.6-2.72.46-2.86
0 8.4
👆🏻

Transparency

Translucent
Transparent to Translucent

Density

2.6 g/cm32.7-2.9 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K0.92 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant, Impact Resistant
Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

Afghanistan, Indonesia, Japan, Russia
South Korea

Africa

Kenya
Western Africa

Europe

Greece, Hungary, Iceland, Italy, Turkey
Great Britain, Switzerland

Others

-
-

Deposits in Western Continents

North America

Canada, Mexico, USA
-

South America

Argentina, Chile, Ecuador, Peru
-

Deposits in Oceania Continent

Australia

New Zealand
Central Australia, Western Australia

Obsidian 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 Obsidian and Pseudotachylite Reserves. Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth. 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 Obsidian vs Pseudotachylite information and Obsidian vs Pseudotachylite characteristics in the upcoming sections.

Obsidian 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. Obsidian vs Pseudotachylite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Obsidian and Properties of Pseudotachylite. Learn more about Obsidian vs Pseudotachylite in the next section. The interior uses of Obsidian include Decorative aggregates and Interior decoration whereas the interior uses of Pseudotachylite include Decorative aggregates, Entryways and Interior decoration. Due to some exceptional properties of Obsidian and Pseudotachylite, they have various applications in construction industry. The uses of Obsidian in construction industry include Arrowheads, Cutting tool, Knives, Scrapers, Spear points and that of Pseudotachylite include As dimension stone, Cement manufacture, For road aggregate, Making natural cement.

More about Obsidian and Pseudotachylite

Here you can know more about Obsidian and Pseudotachylite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Obsidian and Pseudotachylite consists of mineral content and compound content. The mineral content of Obsidian includes 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 Obsidian vs Pseudotachylite, the texture, color and appearance plays an important role in determining the type of rock. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas, Pseudotachylite is available in black, brown, green, grey, pink, white colors. Appearance of Obsidian is Shiny and that of Pseudotachylite is Dull and Soft. Properties of rock is another aspect for Obsidian vs Pseudotachylite. The hardness of Obsidian is 5-5.5 and that of Pseudotachylite is 7. The types of Obsidian are Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian 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 Obsidian is white while that of Pseudotachylite is light to dark brown. The specific heat capacity of Obsidian is 0.92 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.Obsidian is heat resistant, impact resistant whereas Pseudotachylite is heat resistant.