Mylonite

Dolomite

Mylonite and Dolomite

Mylonite

Dolomite

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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

Dolomite is a sedimentary rock containing more than 50 percent of the mineral dolomite by weight

History

Origin

New Zealand

Southern Alps, France

Discoverer

Unknown

Dolomieu

Etymology

From Greek mulōn mill + -ite

From French, from the name of Dolomieu (1750–1801), the French geologist who discovered the rock

Class

Metamorphic Rocks

Sedimentary Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Other Categories

Fine Grained Rock, Opaque Rock

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

Texture

Foliated

Earthy

Color

Black to Grey

Black, Brown, Green, Grey, Pink, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull, Banded and Foilated

Glassy or Pearly

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

Garden Decoration, Office Buildings

Other Architectural Uses

Curbing

Industry

Construction Industry

for Road Aggregate, Landscaping, 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, Production of Glass and Ceramics, Serves as an Oil and Gas Reservoir rock

Medical Industry

Taken as a Supplement for Calcium or Magnesium

Antiquity Uses

Artifacts, Monuments

Artifacts, Jewellery, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Creating Artwork, Gemstone, Jewelry

An Oil and Gas Reservoir, As a Feed Additive for Livestock, Gemstone, Metallurgical Flux, Production of Lime, Soil Conditioner, Source of Magnesia (MgO)

Types

Blastomylonites, Ultramylonites and Phyllonites

Boninite and Jasperoid

Features

Surfaces are often shiny

Host Rock for Lead, Traps for subsurface fluids like Oil and Natural Gas., Zinc and Copper Deposits

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Present

Formation

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

Dolomite rocks are originally deposited as calcite or aragonite rich limestone, but during diagenesis process, the calcite or aragonite is transformed into dolomite.

Composition

Mineral Content

Porphyroblasts

Clay Minerals, Pyrite, Quartz, Sulfides

Compound Content

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

NaCl, CaO, Carbon Dioxide, Magnesium Carbonate, MgO

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Sea Erosion, Wind Erosion

Properties

Physical Properties

Hardness

3-43.5-4

1 7

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Grain Size

Fine Grained

Medium to Fine Coarse Grained

Fracture

Conchoidal

Streak

White

Porosity

Highly Porous

Less Porous

Luster

Shiny

Vitreous and Pearly

Compressive Strength

1.28 N/mm²140.00 N/mm²

0.15 450

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Cleavage

Conchoidal

Perfect

Toughness

Specific Gravity

2.97-3.052.8-3

0 8.4

👆🏻

Transparency

Opaque

Transparent to Translucent

Density

2.6-4.8 g/cm³2.8-2.9 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

1.50 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

👆🏻

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

China, India

Africa

Eritrea, Ethiopia, Ghana, South Africa, Western Africa

Morocco, Namibia

Europe

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

Austria, Italy, Romania, Spain, Switzerland

Others

Deposits in Western Continents

North America

USA

Mexico, USA

South America

Brazil, Colombia

Deposits in Oceania Continent

Australia

Central Australia, Western Australia

New South Wales, Queensland, Yorke Peninsula

All about Mylonite and Dolomite Properties

Know all about Mylonite and Dolomite properties here. All properties of rocks are important as they define the type of rock and its application. Mylonite belongs to Metamorphic Rocks while Dolomite belongs to Sedimentary Rocks.Texture of Mylonite is Foliated whereas that of Dolomite is Earthy. Mylonite appears Dull, Banded and Foilated and Dolomite appears Glassy or Pearly. The luster of Mylonite is shiny while that of Dolomite is vitreous and pearly. Mylonite is available in black to grey colors whereas Dolomite is available in black, brown, green, grey, pink, white colors. The commercial uses of Mylonite are creating artwork, gemstone, jewelry and that of Dolomite are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo).