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Dunite
Dunite

Chalk
Chalk



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Dunite
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Dunite vs Chalk

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Definition

Definition

Dunite is a green to brownish coarse-grained igneous rock mainly consisting of olivine
Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers

History

Origin

New Zealand
-

Discoverer

Ferdinand von Hochstetter
Unknown

Etymology

From the name of Dun Mountain, New Zealand, + -ite1
From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone

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
Fine Grained Rock, Opaque Rock

Texture

Texture

Phaneritic
Clastic or Non-Clastic

Color

Dark Greenish - Grey
Grey, White, Yellow

Maintenance

Less
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Rough and Shiny
Soft

Uses

Architecture

Interior Uses

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

Exterior Uses

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

Other Architectural Uses

Curbing
Powder

Industry

Construction Industry

As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, raw material for manufacture of quicklime and slaked lime, Source of calcium

Medical Industry

-
-

Antiquity Uses

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

Other Uses

Commercial Uses

Creating Artwork, Gemstone, Jewelry, Source of Chromite, Platinum, Nickel and Garnet, Source of Diamonds
Alumina Refineries, Creating Artwork, Drawing on blackboards, Gymnasts, athletes and mountain climbers use for grip, In aquifers, Paper Industry, Production of Lime, Raw material for manufacture of quicklime, slaked lime, Soil Conditioner, Whiting, Whiting material in toothpaste, paint and paper

Types

Types

Dunite
Chalk Marl and Marl

Features

Constitutes upper part of the Earth's mantle, Generally rough to touch, Host rock for Diamond, Is one of the oldest rock
Clasts are smooth to touch, Is one of the oldest rock, Smooth to touch, Very fine grained rock

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Present

Formation

Formation

Dunite is a plutonic ultramafic igneous rock consisting almost m olivine. It can be formed in two ways.
Chalk is formed from lime mud, which accumulates on the sea floor which is then transformed into rock by geological processes.

Composition

Mineral Content

Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene
Calcite, Clay, Clay Minerals, Quartz, Sand

Compound Content

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

Transformation

Metamorphism

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism
-

Weathering

Types of Weathering

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

Erosion

Types of Erosion

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

Properties

Physical Properties

Hardness

3.5-41
1 7
👆🏻

Grain Size

Coarse Grained
Very fine-grained

Fracture

Irregular
-

Streak

White
White

Porosity

Less Porous
Highly Porous

Luster

Shiny
Dull

Compressive Strength

107.55 N/mm25.00 N/mm2
0.15 450
👆🏻

Cleavage

-
-

Toughness

2.1
1

Specific Gravity

3-3.012.3-2.4
0 8.4
👆🏻

Transparency

Translucent to Opaque
Opaque

Density

2.84-2.85 g/cm32.49-2.50 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

1.25 kJ/Kg K0.90 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
Brunei, India, Indonesia, Malaysia, Singapore, Thailand, Vietnam

Africa

Morocco, South Africa
Cameroon, Chad, Ghana, Kenya, Malawi, Sudan, Tanzania, Togo, Zambia, Zimbabwe

Europe

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

Others

-
-

Deposits in Western Continents

North America

Canada, USA
Canada, USA

South America

Argentina, Brazil, Colombia, Ecuador, Venezuela
Colombia

Deposits in Oceania Continent

Australia

New Zealand, Western Australia
Adelaide, New Zealand, Queensland, Victoria, Yorke Peninsula

Dunite vs Chalk 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 Chalk Reserves. Dunite is a green to brownish coarse-grained igneous rock mainly consisting of olivine. Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers. 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 Chalk information and Dunite vs Chalk characteristics in the upcoming sections.

Dunite vs Chalk 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 Chalk characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Dunite and Properties of Chalk. Learn more about Dunite vs Chalk in the next section. The interior uses of Dunite include Decorative aggregates and Interior decoration whereas the interior uses of Chalk include Decorative aggregates, Homes and Interior decoration. Due to some exceptional properties of Dunite and Chalk, 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 Chalk include As dimension stone, Cement manufacture, Construction aggregate, For road aggregate, Making natural cement, Raw material for manufacture of quicklime and slaked lime, Source of calcium.

More about Dunite and Chalk

Here you can know more about Dunite and Chalk. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Dunite and Chalk 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 Chalk includes Calcite, Clay, Clay Minerals, Quartz, Sand. You can also check out the list of all Igneous Rocks. When we have to compare Dunite vs Chalk, the texture, color and appearance plays an important role in determining the type of rock. Dunite is available in dark greenish - grey colors whereas, Chalk is available in grey, white, yellow colors. Appearance of Dunite is Rough and Shiny and that of Chalk is Soft. Properties of rock is another aspect for Dunite vs Chalk. The hardness of Dunite is 3.5-4 and that of Chalk is 1. The types of Dunite are Dunite whereas types of Chalk are Chalk Marl and Marl. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Dunite and Chalk is white. The specific heat capacity of Dunite is 1.25 kJ/Kg K and that of Chalk is 0.90 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 Chalk is heat resistant.