Mylonite

Blueschist

Mylonite and Blueschist

Mylonite

Blueschist

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Definition

Mylonite is a metamorphic rock formed by ductile deformation during intense shearing encountered during folding and faulting, a process termed cataclastic or dynamic metamorphism

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

History

Origin

New Zealand

USA

Discoverer

Unknown

Edgar Bailey

Etymology

From Greek mulōn mill + -ite

From French schiste, Greek skhistos i.e. split

Class

Metamorphic Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Other Categories

Fine Grained Rock, Opaque Rock

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Foliated

Color

Black to 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

Decorative Aggregates, Interior Decoration

Floor Tiles, Flooring, Homes, Hotels, Kitchens

Exterior Uses

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

Garden Decoration, Office Buildings

Other Architectural Uses

Curbing

Industry

Construction Industry

for Road Aggregate, Landscaping, Roadstone

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

Medical Industry

Antiquity Uses

Artifacts, Monuments

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

Creating Artwork, Gemstone, Jewelry

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

Types

Blastomylonites, Ultramylonites and Phyllonites

Metamorphic rock

Features

Surfaces are often shiny

Has High structural resistance against erosion and climate, Very fine grained rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Mylonites are ductilely deformed rocks formed by the accumulation of large shear strain, in ductile fault zones.

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

Porphyroblasts

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

Compound Content

Aluminium Oxide, Calcium Sulfate, Chromium(III) Oxide, Iron(III) Oxide, Magnesium Carbonate, Silicon Dioxide

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

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Sea Erosion, Wind Erosion

Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

3-43.5-4

1 7

👆🏻

Grain Size

Fine Grained

Fine to Medium Grained

Fracture

Conchoidal

Streak

White

White to Grey

Porosity

Highly Porous

Luster

Shiny

Dull

Compressive Strength

1.28 N/mm²220.00 N/mm²

0.15 450

👆🏻

Cleavage

Conchoidal

Slaty

Toughness

1.5

Specific Gravity

2.97-3.053-3.2

0 8.4

👆🏻

Transparency

Opaque

Density

2.6-4.8 g/cm³2.8-2.9 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

1.50 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant

Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Indonesia, Saudi Arabia, South Korea

Japan, Turkey

Africa

Eritrea, Ethiopia, Ghana, South Africa, Western Africa

Egypt, Ethiopia, South Africa

Europe

England, Finland, France, Germany, Great Britain, Greece, United Kingdom

France, Greece, Iceland

Others

Deposits in Western Continents

North America

USA

South America

Deposits in Oceania Continent

Australia

Central Australia, Western Australia

New Zealand

All about Mylonite and Blueschist Properties

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