Dunite

Rhyolite

Dunite and Rhyolite

Dunite

Rhyolite

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Definition

Dunite is a green to brownish coarse-grained igneous rock mainly consisting of olivine

Rhyolite is a fine-grained igneous rock which is rich in silica

History

Origin

New Zealand

North America

Discoverer

Ferdinand von Hochstetter

Ferdinand von Richthofen

Etymology

From the name of Dun Mountain, New Zealand, + -ite1

From German Rhyolit, from Greek rhuax lava stream + lithos stone

Class

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Hard Rock

Family

Group

Plutonic

Volcanic

Other Categories

Coarse Grained Rock, Opaque Rock

Texture

Phaneritic

Aphanitic, Glassy, Porphyritic

Color

Dark Greenish - Grey

Grey, White, Light Black

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Rough and Shiny

Banded

Uses

Architecture

Interior Uses

Decorative Aggregates, Interior Decoration

Decorative Aggregates, Homes, Hotels, Interior Decoration, Kitchens

Exterior Uses

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

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

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar

Arrowheads, As Dimension Stone, Building houses or walls, Construction Aggregate, Cutting Tool, for Road Aggregate, Knives

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts

Other Uses

Commercial Uses

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

Gemstone, Laboratory bench tops, Jewelry

Types

Dunite

Pumice Rocks, Obsidian Rocks, Perlite Rocks, Porphyritic Rocks.

Features

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

Acidic in nature, Available in lots of colors

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Dunite is a plutonic ultramafic igneous rock consisting almost m olivine. It can be formed in two ways.

Rhyolite is a felsic extrusive rock and due to its high silica content, rhyolite lava is very viscous and is volcanic equivalent of granite.

Composition

Mineral Content

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

Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz

Compound Content

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

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

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion, Glacier Erosion, Water Erosion

Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

3.5-46-7

1 7

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Grain Size

Coarse Grained

Large and Coarse Grained

Fracture

Irregular

Sub-conchoidal

Streak

White

Porosity

Less Porous

Highly Porous

Luster

Shiny

Earthy

Compressive Strength

107.55 N/mm²140.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

2.1

Specific Gravity

3-3.012.65-2.67

0 8.4

👆🏻

Transparency

Translucent to Opaque

Opaque

Density

2.84-2.85 g/cm³2.4-2.6 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

1.25 kJ/Kg K0.71 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

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

China, India

Africa

Morocco, South Africa

Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa

Europe

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

Germany, Iceland, Ireland, Italy, Spain

Others

Deposits in Western Continents

North America

Canada, USA

South America

Argentina, Brazil, Colombia, Ecuador, Venezuela

Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela

Deposits in Oceania Continent

Australia

New Zealand, Western Australia

New Zealand, Queensland, Western Australia

All about Dunite and Rhyolite Properties

Know all about Dunite and Rhyolite properties here. All properties of rocks are important as they define the type of rock and its application. Dunite and Rhyolite belong to Igneous Rocks.Texture of Dunite is Phaneritic whereas that of Rhyolite is Aphanitic, Glassy, Porphyritic. Dunite appears Rough and Shiny and Rhyolite appears Banded. The luster of Dunite is shiny while that of Rhyolite is earthy. Dunite is available in dark greenish - grey colors whereas Rhyolite is available in grey, white, light black colors. The commercial uses of Dunite are creating artwork, gemstone, jewelry, source of chromite, platinum, nickel and garnet, source of diamonds and that of Rhyolite are gemstone, laboratory bench tops, jewelry.