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Obsidian
Obsidian

Essexite 
Essexite 



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Obsidian
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Essexite 

Obsidian vs Essexite 

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
Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock

History

Origin

Ethiopia
USA

Discoverer

Obsius
Unknown

Etymology

From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius
From the locality in Essex County, Massachusetts,US

Class

Igneous Rocks
Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock

Family

Group

Volcanic
Plutonic

Other Categories

Opaque Rock
Fine Grained Rock, Opaque Rock

Texture

Texture

Glassy
Granular

Color

Black, Blue, Brown, Green, Orange, Red, Tan, Yellow
Dark Grey to Black

Maintenance

Less
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Shiny
Banded

Uses

Architecture

Interior Uses

Decorative Aggregates, Interior Decoration
Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

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

Other Architectural Uses

-
Curbing

Industry

Construction Industry

Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points
As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate

Medical Industry

Surgery
-

Antiquity Uses

Artifacts, Jewellery
Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Creating Artwork, Mirror, Used in aquariums
Cemetery Markers, Commemorative Tablets, Jewelry, Sea Defence, Tombstones

Types

Types

Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian
Intermediate volcanic rock

Features

Blocks negativity, Helps to protect against depression
Is one of the oldest rock, Smooth to touch

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.
Essexite is a type of igneous rock, which is usually dark grey to black plutonic rock. For the formation of essexite, suitable magma with exact composition of K, Ba, Rb, Cs, Sr should be produced.

Composition

Mineral Content

-
Augite, Feldspar, Hornblende, Nepheline, Olivine, Plagioclase, Pyroxene

Compound Content

Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide
Aluminium Oxide, Ba, Ca, Cs, Potassium, Rb, Sodium, Sr

Transformation

Metamorphism

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism

Weathering

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering
Biological Weathering, Chemical Weathering

Erosion

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion
Coastal Erosion, Glacier Erosion, Water Erosion

Properties

Physical Properties

Hardness

5-5.57
1 7
👆🏻

Grain Size

-
Fine Grained

Fracture

Conchoidal
Conchoidal

Streak

White
Black

Porosity

Very Less Porous
Highly Porous

Luster

Vitreous
-

Compressive Strength

0.15 N/mm2120.00 N/mm2
0.15 450
👆🏻

Cleavage

-
-

Toughness

-
1.6

Specific Gravity

2.6-2.7-9999
0 8.4
👆🏻

Transparency

Translucent
Opaque

Density

2.6 g/cm3-9999 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K0.79 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant, Impact Resistant
Impact Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Afghanistan, Indonesia, Japan, Russia
India, Russia

Africa

Kenya
South Africa

Europe

Greece, Hungary, Iceland, Italy, Turkey
Germany, Greece, Italy, Scotland, Turkey

Others

-
Greenland

Deposits in Western Continents

North America

Canada, Mexico, USA
Canada, USA

South America

Argentina, Chile, Ecuador, Peru
Brazil, Colombia, Venezuela

Deposits in Oceania Continent

Australia

New Zealand
New Zealand, Queensland

Obsidian vs Essexite  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 Essexite  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. Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock. 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 Essexite  information and Obsidian vs Essexite  characteristics in the upcoming sections.

Obsidian vs Essexite  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 Essexite  characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Obsidian and Properties of Essexite . Learn more about Obsidian vs Essexite  in the next section. The interior uses of Obsidian include Decorative aggregates and Interior decoration whereas the interior uses of Essexite  include Decorative aggregates, Homes and Interior decoration. Due to some exceptional properties of Obsidian and Essexite , 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 Essexite  include As dimension stone, Building houses or walls, Cement manufacture, Construction aggregate, For road aggregate.

More about Obsidian and Essexite 

Here you can know more about Obsidian and Essexite . The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Obsidian and Essexite  consists of mineral content and compound content. The mineral content of Obsidian includes and mineral content of Essexite  includes Augite, Feldspar, Hornblende, Nepheline, Olivine, Plagioclase, Pyroxene. You can also check out the list of all Igneous Rocks. When we have to compare Obsidian vs Essexite , 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, Essexite  is available in dark grey to black colors. Appearance of Obsidian is Shiny and that of Essexite  is Banded. Properties of rock is another aspect for Obsidian vs Essexite . The hardness of Obsidian is 5-5.5 and that of Essexite  is 7. The types of Obsidian are Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian whereas types of Essexite  are Intermediate volcanic 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 Essexite  is black. The specific heat capacity of Obsidian is 0.92 kJ/Kg K and that of Essexite  is 0.79 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 Essexite  is impact resistant, pressure resistant, wear resistant.