Soapstone

Chalk

Soapstone and Chalk

Soapstone

Chalk

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Definition

It is a metamorphic magnesium rich rock because it is composed of the mineral talc

Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers

History

Origin

USA

Discoverer

Unknown

Etymology

From 17th century, because of its greasy feel and use like a soap

From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone

Class

Metamorphic Rocks

Sedimentary Rocks

Sub-Class

Durable Rock, Soft Rock

Family

Group

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Polished

Clastic or Non-Clastic

Color

Black, Black to Grey, Green, Grey

Grey, White, Yellow

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull, Banded and Foilated

Soft

Uses

Architecture

Interior Uses

Bathrooms, Decorative Aggregates, Homes, Interior Decoration

Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

As Facing Stone, Garden Decoration

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

Other Architectural Uses

Curbing

Powder

Industry

Construction Industry

Manufacture of Magnesium and Dolomite Refractories

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

Taken as a Supplement for Calcium or Magnesium

Antiquity Uses

Artifacts, Jewellery, Monuments, Sculpture

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Cemetery Markers, Creating Artwork, Gemstone, Jewelry, Manufacture of Soap, Solvents, Dyes, Plastics and Fibres, Production of Lime, Source of Magnesia (MgO)

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

Metamorphic rock

Chalk Marl and Marl

Features

Host Rock for Lead

Clasts are smooth to touch, Is one of the oldest rock, Smooth to touch, Very fine grained rock

Archaeological Significance

Monuments

Famous Monuments

Christ the Redeemer in Rio de Janeiro, Stonehenge in English county of Wiltshire

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Present

Formation

Soapstone is a talc-schist, which is a type of metamorphic rock and it is largely composed of the mineral talc and is thus rich inmagnesium.

Chalk is formed from lime mud, which accumulates on the sea floor which is then transformed into rock by geological processes.

Composition

Mineral Content

Albite, Apatite, Biotite, Calcite, Carbonate, Clay Minerals, Hornblende, Ilmenite, Micas, Plagioclase, Pyroxene, Quartz

Calcite, Clay, Clay Minerals, Quartz, Sand

Compound Content

CaO, Mg, MgO

Ca, NaCl, CaO

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

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

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Water Erosion

Properties

Physical Properties

Hardness

1 7

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Grain Size

Fine Grained

Very fine-grained

Fracture

Conchoidal

Streak

Black

White

Porosity

Less Porous

Highly Porous

Luster

Greasy

Dull

Compressive Strength

225.00 N/mm²5.00 N/mm²

0.15 450

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Cleavage

Perfect

Toughness

Specific Gravity

2.862.3-2.4

0 8.4

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Transparency

Opaque

Density

2.8-2.9 g/cm³2.49-2.50 g/cm³

0 1400

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Thermal Properties

Specific Heat Capacity

0.88 kJ/Kg K0.90 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Indonesia, Japan, North Korea, Russia, Saudi Arabia, Singapore, South Korea, Sri Lanka, Tajikistan, Thailand

Brunei, India, Indonesia, Malaysia, Singapore, Thailand, Vietnam

Africa

Egypt, Ethiopia, Ghana, South Africa, Western Africa

Cameroon, Chad, Ghana, Kenya, Malawi, Sudan, Tanzania, Togo, Zambia, Zimbabwe

Europe

Austria, England, Finland, France, Germany, Greece, Spain, Sweden, Switzerland, United Kingdom

England, France, Germany, Spain, United Kingdom

Others

Deposits in Western Continents

North America

Canada, USA

South America

Colombia

Deposits in Oceania Continent

Australia

Central Australia, New Zealand, Queensland

Adelaide, New Zealand, Queensland, Victoria, Yorke Peninsula

All about Soapstone and Chalk Properties

Know all about Soapstone and Chalk properties here. All properties of rocks are important as they define the type of rock and its application. Soapstone belongs to Metamorphic Rocks while Chalk belongs to Sedimentary Rocks.Texture of Soapstone is Polished whereas that of Chalk is Clastic or Non-Clastic. Soapstone appears Dull, Banded and Foilated and Chalk appears Soft. The luster of Soapstone is greasy while that of Chalk is dull. Soapstone is available in black, black to grey, green, grey colors whereas Chalk is available in grey, white, yellow colors. The commercial uses of Soapstone are cemetery markers, creating artwork, gemstone, jewelry, manufacture of soap, solvents, dyes, plastics and fibres, production of lime, source of magnesia (mgo) and that of Chalk are 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.