Dunite

Lignite

Dunite vs Lignite

Dunite

Lignite

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Definition

Dunite is a green to brownish coarse-grained igneous rock mainly consisting of olivine

Lignite is a soft brownish coal which shows traces of plants and is intermediate between bituminous coal and peat

History

Origin

New Zealand

France

Discoverer

Ferdinand von Hochstetter

Unknown

Etymology

From the name of Dun Mountain, New Zealand, + -ite1

From French, Latin lignum wood + -ite1

Class

Igneous Rocks

Sedimentary Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Soft Rock

Family

Group

Plutonic

Other Categories

Coarse Grained Rock, Opaque Rock

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

Texture

Phaneritic

Amorphous, Glassy

Color

Dark Greenish - Grey

Black, Brown, Dark Brown, Grey, Light to Dark Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Rough and Shiny

Veined or Pebbled

Uses

Architecture

Interior Uses

Decorative Aggregates, Interior Decoration

Exterior Uses

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

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar

for Road Aggregate, Steel Production

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Creating Artwork, Gemstone, Jewelry, Source of Chromite, Platinum, Nickel and Garnet, Source of Diamonds

Electricity Generation

Types

Dunite

Xyloid Lignite or Fossil Wood and Compact Lignite or Perfect Lignite

Features

Constitutes upper part of the Earth's mantle, Generally rough to touch, Host rock for Diamond, Is one of the oldest rock

Generally rough to touch, Helps in production of Heat and Electricity, Used as fossil fuel

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Present

Formation

Dunite is a plutonic ultramafic igneous rock consisting almost m olivine. It can be formed in two ways.

Coal formation takes place due to accumulation of plant debris in a swamp environment. The Coal formation process continues, as peat turns into lignite brown or black coal at increasing heat and pressure.

Composition

Mineral Content

Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene

Compound Content

Ca, CaO, Fe, Potassium, Silicon Dioxide, Sodium, Titanium Dioxide

Carbon, Hydrogen, Nitrogen, Oxygen, Sulphur

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion, Glacier Erosion, Water Erosion

Chemical Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

3.5-41

1 7

👆🏻

Grain Size

Coarse Grained

Medium to Fine Coarse Grained

Fracture

Irregular

Conchoidal

Streak

White

Black

Porosity

Less Porous

Highly Porous

Luster

Shiny

Dull to Vitreous to Submetallic

Compressive Strength

107.55 N/mm²-

0.15 450

👆🏻

Cleavage

Toughness

2.1

Specific Gravity

3-3.011.1-1.4

0 8.4

👆🏻

Transparency

Translucent to Opaque

Opaque

Density

2.84-2.85 g/cm³800-801 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

1.25 kJ/Kg K1.26 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Indonesia, Kazakhstan, Russia, South Korea, Thailand, Turkey

Bangladesh, Burma, Cambodia, China, India, Indonesia, Kazakhstan, Malaysia, Mongolia, Pakistan, Turkey, Vietnam

Africa

Morocco, South Africa

Botswana, Kenya, Morocco, Mozambique, South Africa, Tanzania

Europe

Finland, France, Georgia, Germany, Great Britain, Italy, Kazakhstan, Netherlands, Norway, Spain, Switzerland

Belgium, Bulgaria, England, France, Germany, Greece, Hungary, Kosovo, Netherlands, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, The Czech Republic, Ukraine, United Kingdom

Others

Deposits in Western Continents

North America

Canada, USA

Canada, Mexico, USA

South America

Argentina, Brazil, Colombia, Ecuador, Venezuela

Brazil, Chile, Colombia, Venezuela

Deposits in Oceania Continent

Australia

New Zealand, Western Australia

New South Wales, Queensland, Victoria

Dunite vs Lignite 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 Dunite and Lignite Reserves. Dunite is a green to brownish coarse-grained igneous rock mainly consisting of olivine. Lignite is a soft brownish coal which shows traces of plants and is intermediate between bituminous coal and peat. 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 Dunite vs Lignite information and Dunite vs Lignite characteristics in the upcoming sections.

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Dunite vs Lignite 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. Dunite vs Lignite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Dunite and Properties of Lignite. Learn more about Dunite vs Lignite in the next section. The interior uses of Dunite include Decorative aggregates and Interior decoration whereas the interior uses of Lignite include . Due to some exceptional properties of Dunite and Lignite, they have various applications in construction industry. The uses of Dunite in construction industry include As dimension stone, Cement manufacture, Construction aggregate, For road aggregate, Making natural cement, Raw material for the manufacture of mortar and that of Lignite include For road aggregate, Steel production.

More about Dunite and Lignite

Here you can know more about Dunite and Lignite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Dunite and Lignite consists of mineral content and compound content. The mineral content of Dunite includes Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene and mineral content of Lignite includes . You can also check out the list of all Igneous Rocks. When we have to compare Dunite vs Lignite, the texture, color and appearance plays an important role in determining the type of rock. Dunite is available in dark greenish - grey colors whereas, Lignite is available in black, brown, dark brown, grey, light to dark grey colors. Appearance of Dunite is Rough and Shiny and that of Lignite is Veined or Pebbled. Properties of rock is another aspect for Dunite vs Lignite. The hardness of Dunite is 3.5-4 and that of Lignite is 1. The types of Dunite are Dunite whereas types of Lignite are Xyloid Lignite or Fossil Wood and Compact Lignite or Perfect Lignite. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Dunite is white while that of Lignite is black. The specific heat capacity of Dunite is 1.25 kJ/Kg K and that of Lignite is 1.26 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Dunite is heat resistant, pressure resistant, wear resistant whereas Lignite is heat resistant.