Mylonite and Larvikite

Mylonite

Larvikite

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

Larvikite is an igneous rock and a variety of monzonite, notable for the presence of thumbnail-sized crystals of feldspar

History

Origin

New Zealand

Larvik, Norway

Discoverer

Unknown

Etymology

From Greek mulōn mill + -ite

From the town of Larvik in Norway, where this type of igneous rock is found

Class

Metamorphic Rocks

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Hard Rock

Family

Group

Not Applicable

Plutonic

Other Categories

Fine Grained Rock, Opaque Rock

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

Texture

Foliated

Phaneritic

Color

Black to Grey

Black, Brown, Light to Dark Grey, White

Maintenance

Less

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Yes

Stain Resistant

Yes

Wind Resistant

Yes

Acid Resistant

Appearance

Dull, Banded and Foilated

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, Cement Manufacture, Construction Aggregate, for Road Aggregate

Medical Industry

Not Yet Used

Antiquity Uses

Artifacts, Monuments

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

Creating Artwork, Gemstone, Jewelry

Cemetery Markers, Commemorative Tablets, Creating Artwork

Types

Blastomylonites, Ultramylonites and Phyllonites

Quartz Monzonite, Syenite and Diorite

Features

Surfaces are often shiny

Available in lots of colors, Is one of the oldest rock

Archaeological Significance

Monuments

Used

Famous Monuments

Data Not Available

Sculpture

Used

Famous Sculptures

Data Not Available

Pictographs

Used

Not Used

Petroglyphs

Used

Not Used

Figurines

Used

Fossils

Absent

Formation

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

Larvikite 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

Albite, Amphibole, Apatite, Biotite, Feldspar, Hornblade, Ilmenite, Magnetite, Muscovite or Illite, Olivine, Plagioclase, Pyroxene, Quartz, Sulfides, Titanite, Zircon

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

Yes

Types of Metamorphism

Not Applicable

Cataclastic Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

Yes

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

Yes

Types of Erosion

Chemical Erosion, Sea Erosion, Wind Erosion

Chemical Erosion

Properties

Physical Properties

Hardness

3-4

6-7

Grain Size

Fine Grained

Medium to Fine Coarse Grained

Fracture

Conchoidal

Not Available

Streak

White

Porosity

Highly Porous

Less Porous

Luster

Shiny

Subvitreous to Dull

Compressive Strength

1.28 N/mm²

310.00 N/mm²

Cleavage

Conchoidal

Not Available

Toughness

Not Available

Specific Gravity

2.97-3.05

2.8-3

Transparency

Opaque

Density

2.6-4.8 g/cm³

2.9-2.91 g/cm³

Thermal Properties

Specific Heat Capacity

1.50 kJ/Kg K

0.92 kJ/Kg K

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Indonesia, Saudi Arabia, South Korea

Not Yet Found

Africa

Eritrea, Ethiopia, Ghana, South Africa, Western Africa

Not Yet Found

Europe

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

Bulgaria, England, Germany, Norway, Romania, Switzerland

Others

Not Yet Found

Deposits in Western Continents

North America

USA

South America

Not Yet Found

Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Peru

Deposits in Oceania Continent

Australia

Central Australia, Western Australia

New South Wales, New Zealand, Queensland, South Australia, Western Australia

Summary >>

<< Reserves

All about Mylonite and Larvikite Properties

Know all about Mylonite and Larvikite properties here. All properties of rocks are important as they define the type of rock and its application. Mylonite belongs to Metamorphic Rocks while Larvikite belongs to Igneous Rocks.Texture of Mylonite is Foliated whereas that of Larvikite is Phaneritic. Mylonite appears Dull, Banded and Foilated and Larvikite appears Shiny. The luster of Mylonite is shiny while that of Larvikite is subvitreous to dull. Mylonite is available in black to grey colors whereas Larvikite is available in black, brown, light to dark grey, white colors. The commercial uses of Mylonite are creating artwork, gemstone, jewelry and that of Larvikite are cemetery markers, commemorative tablets, creating artwork.