Soapstone

Blueschist

Soapstone and Blueschist

Soapstone

Blueschist

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Definition

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

Blueschist is a metamorphic rock which is generally blue in color and is formed under conditions of high pressure and low temperature

History

Origin

USA

Discoverer

Unknown

Edgar Bailey

Etymology

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

From French schiste, Greek skhistos i.e. split

Class

Metamorphic Rocks

Sub-Class

Durable Rock, Soft Rock

Durable Rock, Medium Hardness Rock

Family

Group

Other Categories

Fine Grained Rock, Opaque Rock

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Polished

Foliated

Color

Black, Black to Grey, Green, Grey

Blue, Bluish - Grey, Purple, Shades of Blue

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull, Banded and Foilated

Dull and Banded

Uses

Architecture

Interior Uses

Bathrooms, Decorative Aggregates, Homes, Interior Decoration

Floor Tiles, Flooring, Homes, Hotels, Kitchens

Exterior Uses

As Facing Stone, Garden Decoration

Garden Decoration, Office Buildings

Other Architectural Uses

Curbing

Industry

Construction Industry

Manufacture of Magnesium and Dolomite Refractories

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

Medical Industry

Taken as a Supplement for Calcium or Magnesium

Antiquity Uses

Artifacts, Jewellery, Monuments, Sculpture

Artifacts, Monuments, Sculpture

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)

Cemetery Markers, Commemorative Tablets, Creating Artwork, Curling, Tombstones

Types

Metamorphic rock

Features

Host Rock for Lead

Has High structural resistance against erosion and climate, 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

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.

Blueschist forms due to the metamorphism of basalt and other rocks with similar composition at high pressures and low temperatures and approximately corresponding to a depth of 15 to 30 kilometers and 200 to 500 °C.

Composition

Mineral Content

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

Albite, Chlorite, Epidote, Garnet, Glaucophane, Lawsonite, Muscovite or Illite, Quartz

Compound Content

CaO, Mg, MgO

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

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

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

Weathering

✔ ✘

Types of Weathering

Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

13.5-4

1 7

👆🏻

Grain Size

Fine Grained

Fine to Medium Grained

Fracture

Conchoidal

Streak

Black

White to Grey

Porosity

Less Porous

Highly Porous

Luster

Greasy

Dull

Compressive Strength

225.00 N/mm²220.00 N/mm²

0.15 450

👆🏻

Cleavage

Perfect

Slaty

Toughness

1.5

Specific Gravity

2.863-3.2

0 8.4

👆🏻

Transparency

Opaque

Density

2.8-2.9 g/cm³2.8-2.9 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.88 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant

Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

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

Japan, Turkey

Africa

Egypt, Ethiopia, Ghana, South Africa, Western Africa

Egypt, Ethiopia, South Africa

Europe

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

France, Greece, Iceland

Others

Deposits in Western Continents

North America

Canada, USA

USA

South America

Colombia

Deposits in Oceania Continent

Australia

Central Australia, New Zealand, Queensland

New Zealand

All about Soapstone and Blueschist Properties

Know all about Soapstone and Blueschist properties here. All properties of rocks are important as they define the type of rock and its application. Soapstone and Blueschist belong to Metamorphic Rocks.Texture of Soapstone is Polished whereas that of Blueschist is Foliated. Soapstone appears Dull, Banded and Foilated and Blueschist appears Dull and Banded. The luster of Soapstone is greasy while that of Blueschist is dull. Soapstone is available in black, black to grey, green, grey colors whereas Blueschist is available in blue, bluish - grey, purple, shades of blue 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 Blueschist are cemetery markers, commemorative tablets, creating artwork, curling, tombstones.