Lherzolite

Obsidian

Lherzolite and Obsidian

Lherzolite

Obsidian

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1 Definition

1.1 Definition

Lherzolite is a type of ultramafic igneous rock which contains essential olivine and clinopyroxene and orthopyroxene in equal proportions

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth

1.2 History

1.2.1 Origin

France

Ethiopia

1.2.2 Discoverer

Unknown

Obsius

1.3 Etymology

From the Lherz Massif, an alpine peridotite complex, at Étang de Lers, near Massat in the French Pyrenees; Lherz is the archaic spelling of this location

From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius

1.4 Class

Igneous Rocks

1.4.1 Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

1.5 Family

1.5.1 Group

Plutonic

Volcanic

1.6 Other Categories

Fine Grained Rock, Opaque Rock

Opaque Rock

2 Texture

2.1 Texture

Grenue

Glassy

2.2 Color

Black, Dark Greenish - Grey, Green, Pink, Purple

Black, Blue, Brown, Green, Orange, Red, Tan, Yellow

2.3 Maintenance

Less

2.4 Durability

Durable

2.4.1 Water Resistant

✔ ✘

2.4.2 Scratch Resistant

✔ ✘

2.4.3 Stain Resistant

✔ ✘

2.4.4 Wind Resistant

✔ ✘

2.4.5 Acid Resistant

✔ ✘

2.5 Appearance

Glassy, Vesicular and Foilated

Shiny

3 Uses

3.1 Architecture

3.1.1 Interior Uses

Decorative Aggregates, Entryways, Homes, Interior Decoration

Decorative Aggregates, Interior Decoration

3.1.2 Exterior Uses

As Building Stone, As Facing Stone, Office Buildings

Garden Decoration

3.1.3 Other Architectural Uses

Curbing

Not Yet Used

3.2 Industry

3.2.1 Construction Industry

Landscaping, Manufacture of Magnesium and Dolomite Refractories, Used for flooring, stair treads, borders and window sills.

Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points

3.2.2 Medical Industry

Not Yet Used

Surgery

3.3 Antiquity Uses

Artifacts, Sculpture

Artifacts, Jewellery

3.4 Other Uses

3.4.1 Commercial Uses

As armour rock for sea walls, Source of Magnesia (MgO), Used in aquariums

Creating Artwork, Mirror, Used in aquariums

4 Types

4.1 Types

Garnet Lherzolite

Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian

4.2 Features

Host Rock for Lead

Blocks negativity, Helps to protect against depression

4.3 Archaeological Significance

4.3.1 Monuments

Not Yet Used

4.3.2 Famous Monuments

Not Applicable

4.3.3 Sculpture

Used

Not Yet Used

4.3.4 Famous Sculptures

Data Not Available

Not Applicable

4.3.5 Pictographs

Not Used

Used

4.3.6 Petroglyphs

Not Used

Used

4.3.7 Figurines

Used

Not Yet Used

4.4 Fossils

Absent

5 Formation

5.1 Formation

Lherzolite 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.

When the lava is released from volcano, it undergoes a very rapid cooling which freezes the mechanisms of crystallization. The result is a volcanic glass with a uniform smooth texture.

5.2 Composition

5.2.1 Mineral Content

Harzburgite, Olivine, Pyroxene, Pyrrhotite

Not Available

5.2.2 Compound Content

CaO, Cr, Chromium(III) Oxide, MgO

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

5.3 Transformation

5.3.1 Metamorphism

✔ ✘

5.3.2 Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

5.3.3 Weathering

✔ ✘

5.3.4 Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

5.3.5 Erosion

✔ ✘

5.3.6 Types of Erosion

Chemical Erosion, Water Erosion, Wind Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

6 Properties

6.1 Physical Properties

6.1.1 Hardness

6.55-5.5

1 7

6.2.2 Grain Size

Fine Grained

Not Applicable

6.2.3 Fracture

Conchoidal

6.2.4 Streak

White

6.2.5 Porosity

Less Porous

Very Less Porous

6.2.6 Luster

Subvitreous to Dull

Vitreous

6.2.7 Compressive Strength

290.00 N/mm²0.15 N/mm²

0.15 450

7.3.2 Cleavage

Perfect

Non-Existent

7.3.3 Toughness

2.7

Not Available

7.3.4 Specific Gravity

2.862.6-2.7

0 8.4

7.3.5 Transparency

Opaque

Translucent

7.3.6 Density

2.8-2.9 g/cm³2.6 g/cm³

0 1400

7.4 Thermal Properties

7.4.1 Specific Heat Capacity

0.95 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

7.4.2 Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Impact Resistant

8 Reserves

8.1 Deposits in Eastern Continents

8.1.1 Asia

Russia, South Korea

Afghanistan, Indonesia, Japan, Russia

8.1.2 Africa

Western Africa

Kenya

8.1.3 Europe

United Kingdom

Greece, Hungary, Iceland, Italy, Turkey

8.1.4 Others

Not Yet Found

8.2 Deposits in Western Continents

8.2.1 North America

USA

Canada, Mexico, USA

8.2.2 South America

Not Yet Found

Argentina, Chile, Ecuador, Peru

8.3 Deposits in Oceania Continent

8.3.1 Australia

Central Australia, Western Australia

New Zealand

All about Lherzolite and Obsidian Properties

Know all about Lherzolite and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Lherzolite and Obsidian belong to Igneous Rocks.Texture of Lherzolite is Grenue whereas that of Obsidian is Glassy. Lherzolite appears Glassy, Vesicular and Foilated and Obsidian appears Shiny. The luster of Lherzolite is subvitreous to dull while that of Obsidian is vitreous. Lherzolite is available in black, dark greenish - grey, green, pink, purple colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Lherzolite are as armour rock for sea walls, source of magnesia (mgo), used in aquariums and that of Obsidian are creating artwork, mirror, used in aquariums.