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Obsidian
Obsidian

Dolomite
Dolomite



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Obsidian vs Dolomite

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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
Dolomite is a sedimentary rock containing more than 50 percent of the mineral dolomite by weight

History

Origin

Ethiopia
Southern Alps, France

Discoverer

Obsius
Dolomieu

Etymology

From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius
From French, from the name of Dolomieu (1750–1801), the French geologist who discovered the rock

Class

Igneous Rocks
Sedimentary Rocks

Sub-Class

Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock

Family

Group

Volcanic
-

Other Categories

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

Texture

Texture

Glassy
Earthy

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
Glassy or Pearly

Uses

Architecture

Interior Uses

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

Exterior Uses

Garden Decoration
Garden Decoration, Office Buildings

Other Architectural Uses

-
-

Industry

Construction Industry

Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points
As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement, Manufacture of Magnesium and Dolomite Refractories, Production of Glass and Ceramics, Serves as an Oil and Gas Reservoir rock

Medical Industry

Surgery
Taken as a Supplement for Calcium or Magnesium

Antiquity Uses

Artifacts, Jewellery
Artifacts, Jewellery, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Creating Artwork, Mirror, Used in aquariums
An Oil and Gas Reservoir, As a Feed Additive for Livestock, Gemstone, Metallurgical Flux, Production of Lime, Soil Conditioner, Source of Magnesia (MgO)

Types

Types

Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian
Boninite and Jasperoid

Features

Blocks negativity, Helps to protect against depression
Host Rock for Lead, Traps for subsurface fluids like Oil and Natural Gas., Zinc and Copper Deposits

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Present

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.
Dolomite rocks are originally deposited as calcite or aragonite rich limestone, but during diagenesis process, the calcite or aragonite is transformed into dolomite.

Composition

Mineral Content

-
Clay Minerals, Pyrite, Quartz, Sulfides

Compound Content

Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide
NaCl, CaO, Carbon Dioxide, Magnesium Carbonate, MgO

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

5-5.53.5-4
1 7
👆🏻

Grain Size

-
Medium to Fine Coarse Grained

Fracture

Conchoidal
Conchoidal

Streak

White
White

Porosity

Very Less Porous
Less Porous

Luster

Vitreous
Vitreous and Pearly

Compressive Strength

0.15 N/mm2140.00 N/mm2
0.15 450
👆🏻

Cleavage

-
Perfect

Toughness

-
1

Specific Gravity

2.6-2.72.8-3
0 8.4
👆🏻

Transparency

Translucent
Transparent to Translucent

Density

2.6 g/cm32.8-2.9 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, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Afghanistan, Indonesia, Japan, Russia
China, India

Africa

Kenya
Morocco, Namibia

Europe

Greece, Hungary, Iceland, Italy, Turkey
Austria, Italy, Romania, Spain, Switzerland

Others

-
-

Deposits in Western Continents

North America

Canada, Mexico, USA
Mexico, USA

South America

Argentina, Chile, Ecuador, Peru
Brazil, Colombia

Deposits in Oceania Continent

Australia

New Zealand
New South Wales, Queensland, Yorke Peninsula

Obsidian vs Dolomite 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 Dolomite 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. Dolomite is a sedimentary rock containing more than 50 percent of the mineral dolomite by weight. 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 Dolomite information and Obsidian vs Dolomite characteristics in the upcoming sections.

Obsidian vs Dolomite 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 Dolomite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Obsidian and Properties of Dolomite. Learn more about Obsidian vs Dolomite in the next section. The interior uses of Obsidian include Decorative aggregates and Interior decoration whereas the interior uses of Dolomite include Decorative aggregates, Homes and Interior decoration. Due to some exceptional properties of Obsidian and Dolomite, 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 Dolomite include As a flux in the production of steel and pig iron, As a sintering agent in steel industry to process iron ore, As dimension stone, Cement manufacture, For road aggregate, Making natural cement, Manufacture of magnesium and dolomite refractories, Production of glass and ceramics, Serves as an oil and gas reservoir rock.

More about Obsidian and Dolomite

Here you can know more about Obsidian and Dolomite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Obsidian and Dolomite consists of mineral content and compound content. The mineral content of Obsidian includes and mineral content of Dolomite includes Clay Minerals, Pyrite, Quartz, Sulfides. You can also check out the list of all Igneous Rocks. When we have to compare Obsidian vs Dolomite, 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, Dolomite is available in black, brown, green, grey, pink, white colors. Appearance of Obsidian is Shiny and that of Dolomite is Glassy or Pearly. Properties of rock is another aspect for Obsidian vs Dolomite. The hardness of Obsidian is 5-5.5 and that of Dolomite is 3.5-4. The types of Obsidian are Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian whereas types of Dolomite are Boninite and Jasperoid. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Obsidian and Dolomite is white. The specific heat capacity of Obsidian is 0.92 kJ/Kg K and that of Dolomite 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 Dolomite is heat resistant, pressure resistant, wear resistant.