Schist

Jaspillite

Schist and Jaspillite

Schist

Jaspillite

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Definition

Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation

Jaspillite is an iron rich chemically formed rock which is common in banded iron formation rocks

History

Origin

Western Australia, Minnesota

Discoverer

Unknown

Etymology

From French schiste, Greek skhistos i.e. split

From Jaspilite (Mineral), a compact siliceous rock which resembles jasper

Class

Metamorphic Rocks

Sedimentary Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Soft Rock

Family

Group

Other Categories

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

Coarse Grained Rock, Opaque Rock

Texture

Foliated, Platy

Banded, Trellis

Color

Black, Blue, Brown, Dark Brown, Green, Grey, Silver

Red, Reddish Brown

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Layered and Shiny

Banded and Glassy

Uses

Architecture

Interior Uses

Decorative Aggregates, Floor Tiles, Interior Decoration

Decorative Aggregates, Interior Decoration

Exterior Uses

Garden Decoration, Paving Stone

As Facing Stone, Garden Decoration, Paving Stone

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Building houses or walls, Cement Manufacture, for Road Aggregate, Roadstone

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

Medical Industry

Antiquity Uses

Artifacts

Artifacts, Jewellery, Monuments

Other Uses

Commercial Uses

Used in aquariums, Writing Slates

Creating Artwork, Jewelry

Types

Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist.

Algoma-type , Lake Superior-type and Superior-type

Features

Easily splits into thin plates, Smooth to touch

Is one of the oldest rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Present

Formation

Schist formed by dynamic metamorphism at high temperatures and pressures that aligns the grains of mica, hornblende and other elongated minerals into thin layers.

Jaspillite is a type of sedimentary rock which is formed by the compaction and sedimentation of pieces of broken or weathered rocks and minerals.

Composition

Mineral Content

Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc

Coesite, Quartz, Sand

Compound Content

CaO, Carbon Dioxide, MgO

Fe, Iron(III) Oxide, Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering, Chemical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

Chemical Erosion, Coastal Erosion

Properties

Physical Properties

Hardness

3.5-43

1 7

👆🏻

Grain Size

Medium to Fine Coarse Grained

Large and Coarse Grained

Fracture

Conchoidal

Streak

White

Porosity

Highly Porous

Very Less Porous

Luster

Shiny

Earthy

Compressive Strength

150.00 N/mm²230.00 N/mm²

0.15 450

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Cleavage

Slaty

Toughness

1.5

Specific Gravity

2.5-2.95.0-5.3

0 8.4

👆🏻

Transparency

Opaque

Translucent to Opaque

Density

2.8-2.9 g/cm³0-5.7 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.70 kJ/Kg K3.20 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Impact Resistant, Pressure Resistant, Water Resistant

Heat Resistant, Impact Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Afghanistan, Bangladesh, Bhutan, China, India, Japan, Kazakhstan, Malaysia, Pakistan, Russia, Thailand, Turkey, Vietnam

Russia

Africa

Egypt, Ethiopia, Morocco, Nigeria, South Africa

Europe

Austria, England, France, Georgia, Germany, Italy, Liechtenstein, Monaco, Norway, Slovenia, Spain, Sweden, Switzerland

Ukraine

Others

Deposits in Western Continents

North America

Canada, Costa Rica, Cuba, Mexico, Panama, USA

Canada, USA

South America

Brazil, Colombia, Guyana

Brazil

Deposits in Oceania Continent

Australia

New South Wales, New Zealand, Queensland

Western Australia

All about Schist and Jaspillite Properties

Know all about Schist and Jaspillite properties here. All properties of rocks are important as they define the type of rock and its application. Schist belongs to Metamorphic Rocks while Jaspillite belongs to Sedimentary Rocks.Texture of Schist is Foliated, Platy whereas that of Jaspillite is Banded, Trellis. Schist appears Layered and Shiny and Jaspillite appears Banded and Glassy. The luster of Schist is shiny while that of Jaspillite is earthy. Schist is available in black, blue, brown, dark brown, green, grey, silver colors whereas Jaspillite is available in red, reddish brown colors. The commercial uses of Schist are used in aquariums, writing slates and that of Jaspillite are creating artwork, jewelry.