Peridotite and Porphyry

Peridotite

Porphyry

Definition

Peridotite is a dense, coarse-grained plutonic is the main constituent of the earth's mantle

Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix

History

Origin

Pike County, U.S

Egypt

Discoverer

Unknown

Etymology

From French, from peridot +‎ -ite

From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites

Class

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Hard Rock

Family

Group

Plutonic

Other Categories

Coarse Grained Rock, Opaque Rock

Fine Grained Rock, Opaque Rock

Texture

Phaneritic

Porphyritic

Color

Dark Greenish - Grey

Black, Brown, Colourless, Green, Grey, Red, Rust, White

Maintenance

Less

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Yes

Stain Resistant

Yes

Wind Resistant

Acid Resistant

Yes

Appearance

Rough and Shiny

Dull

Uses

Architecture

Interior Uses

Decorative Aggregates, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration

Garden Decoration, Paving Stone

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Cobblestones

Construction Aggregate

Medical Industry

Not Yet Used

Antiquity Uses

Monuments, Sculpture, Small Figurines

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

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

Creating Artwork, Gemstone, Jewelry

Types

Dunite, Wehrlite, Harzburgite, Lherzolite and Pyrolite

Rhomb Porphyry

Features

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

Generally rough to touch, Is one of the oldest rock, Surfaces are often shiny

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

Peridotites can be formed in two ways: as mantle rocks formed during the accretion and differentiation of the Earth or as cumulate rocks formed by precipitation of olivine and pyroxenes from basaltic magmas.

Porphyry is formed in two stages: the magma cools slowly deep within the crust or the magma is cools rapidly as it erupts from a volcano, creating small grains that are usually invisible to naked eye.

Composition

Mineral Content

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

Biotite, Chert, Feldspar, Garnet, Graphite, Quartz, Silica

Compound Content

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

Aluminium Oxide, CaO, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Titanium Dioxide

Transformation

Metamorphism

Yes

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

Yes

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering, Chemical Weathering, Not Registered

Erosion

Yes

Types of Erosion

Chemical Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

Properties

Physical Properties

Hardness

5.5-6

6-7

Grain Size

Coarse Grained

Fine Grained

Fracture

Irregular

Streak

White

Porosity

Less Porous

Luster

Shiny

Dull

Compressive Strength

107.55 N/mm²

Not Available

Cleavage

Imperfect

Toughness

2.1

1.7

Specific Gravity

3-3.01

2.5-4

Transparency

Translucent to Opaque

Density

3.1-3.4 g/cm³

2.5-2.52 g/cm³

Thermal Properties

Specific Heat Capacity

1.26 kJ/Kg K

Not Available

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Indonesia, Kazakhstan, Russia, South Korea, Thailand, Turkey

China, Kazakhstan, South Korea, Thailand, Turkey, Vietnam

Africa

Morocco, South Africa

Egypt, Ethiopia, Ghana, South Africa

Europe

Finland, France, Georgia, Germany, Great Britain, Italy, Kazakhstan, Netherlands, Norway, Spain, Switzerland, Venezuela

Finland, France, Germany, Great Britain, Hungary, Iceland, Ireland, Italy, Netherlands, Norway, Romania, Sweden, Switzerland

Others

Not Yet Found

Greenland

Deposits in Western Continents

North America

Canada, USA

Canada, Cuba, Jamaica, USA

South America

Brazil

Bolivia, Brazil, Colombia, Ecuador, Paraguay

Deposits in Oceania Continent

Australia

New Zealand, Western Australia

New South Wales, New Zealand, Western Australia

Summary >>

<< Reserves

All about Peridotite and Porphyry Properties

Know all about Peridotite and Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Peridotite and Porphyry belong to Igneous Rocks.Texture of Peridotite is Phaneritic whereas that of Porphyry is Porphyritic. Peridotite appears Rough and Shiny and Porphyry appears Dull. The luster of Peridotite is shiny while that of Porphyry is dull. Peridotite is available in dark greenish - grey colors whereas Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors. The commercial uses of Peridotite and Porphyry are creating artwork, gemstone, jewelry, source of chromite, platinum, nickel and garnet, source of diamonds.