Mylonite and Harzburgite

Mylonite

Harzburgite

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

Harzburgite is a plutonic rock of the peridotite group consisting largely of orthopyroxene and olivine

History

Origin

New Zealand

Germany

Discoverer

Unknown

Etymology

From Greek mulōn mill + -ite

From the name of a town in Harzburg, Germany

Class

Metamorphic Rocks

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Not Applicable

Plutonic

Other Categories

Fine Grained Rock, Opaque Rock

Coarse Grained Rock, Opaque Rock

Texture

Foliated

Phaneritic

Color

Black to Grey

Dark Greenish - Grey

Maintenance

Less

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Yes

Stain Resistant

Yes

Wind Resistant

Yes

Acid Resistant

Appearance

Dull, Banded and Foilated

Rough and Shiny

Uses

Architecture

Interior Uses

Decorative Aggregates, Interior Decoration

Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

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

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

Other Architectural Uses

Curbing

Industry

Construction Industry

for Road Aggregate, Landscaping, Roadstone

As Dimension Stone, Cobblestones

Medical Industry

Not Yet Used

Antiquity Uses

Artifacts, Monuments

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Creating Artwork, Gemstone, Jewelry

Creating Artwork, Gemstone, Jewelry, Source of Chromite, Platinum, Nickel and Garnet, Source of Diamonds

Types

Blastomylonites, Ultramylonites and Phyllonites

Not Available

Features

Surfaces are often shiny

Constitutes upper part of the Earth's mantle, Generally rough to touch, Is one of the oldest rock

Archaeological Significance

Monuments

Used

Famous Monuments

Data Not Available

Sculpture

Used

Famous Sculptures

Data Not Available

Pictographs

Used

Petroglyphs

Used

Figurines

Used

Fossils

Absent

Formation

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

Harzburgite is a fine-grained, hard rock which is a type of metasomatite, essentially altered basalt. It forms with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.

Composition

Mineral Content

Porphyroblasts

Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene

Compound Content

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

Ca, Fe, Mg, Potassium, Silicon Dioxide, Sodium, Titanium Dioxide

Transformation

Metamorphism

Yes

Types of Metamorphism

Not Applicable

Impact Metamorphism

Weathering

Yes

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Chemical Weathering, Mechanical Weathering

Erosion

Yes

Types of Erosion

Chemical Erosion, Sea Erosion, Wind Erosion

Chemical Erosion, Sea Erosion

Properties

Physical Properties

Hardness

3-4

5.5-6

Grain Size

Fine Grained

Coarse Grained

Fracture

Conchoidal

Irregular

Streak

White

Porosity

Highly Porous

Less Porous

Luster

Shiny

Compressive Strength

1.28 N/mm²

Not Available

Cleavage

Conchoidal

Imperfect

Toughness

Not Available

2.1

Specific Gravity

2.97-3.05

3-3.01

Transparency

Opaque

Translucent to Opaque

Density

2.6-4.8 g/cm³

3.1-3.4 g/cm³

Thermal Properties

Specific Heat Capacity

1.50 kJ/Kg K

1.25 kJ/Kg K

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Indonesia, Saudi Arabia, South Korea

Japan, Oman

Africa

Eritrea, Ethiopia, Ghana, South Africa, Western Africa

South Africa

Europe

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

France, Germany, Italy, Venezuela

Others

Not Yet Found

Hawaii Islands, Mid-Atlantic Ridge

Deposits in Western Continents

North America

USA

Canada, USA

South America

Not Yet Found

Deposits in Oceania Continent

Australia

Central Australia, Western Australia

Not Yet Found

Summary >>

<< Reserves

All about Mylonite and Harzburgite Properties

Know all about Mylonite and Harzburgite properties here. All properties of rocks are important as they define the type of rock and its application. Mylonite belongs to Metamorphic Rocks while Harzburgite belongs to Igneous Rocks.Texture of Mylonite is Foliated whereas that of Harzburgite is Phaneritic. Mylonite appears Dull, Banded and Foilated and Harzburgite appears Rough and Shiny. The luster of Mylonite and Harzburgite is shiny. Mylonite is available in black to grey colors whereas Harzburgite is available in dark greenish - grey colors. The commercial uses of Mylonite are creating artwork, gemstone, jewelry and that of Harzburgite are creating artwork, gemstone, jewelry, source of chromite, platinum, nickel and garnet, source of diamonds.