Quartzite

Rhyolite

Quartzite and Rhyolite

Quartzite

Rhyolite

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Definition

Quartzite is a non-foliated metamorphic rock that forms by the metamorphism of pure quartz Sandstone

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

History

Origin

North America

Discoverer

Unknown

Ferdinand von Richthofen

Etymology

From quartz + -ite

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

Class

Metamorphic Rocks

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Medium Grained Rock, Opaque Rock

Coarse Grained Rock, Opaque Rock

Texture

Foliated, Granular

Aphanitic, Glassy, Porphyritic

Color

Black, Blue, Brown, Green, Light Grey, Purple, White, Yellow

Grey, White, Light Black

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Lustrous

Banded

Uses

Architecture

Interior Uses

Countertops, Decorative Aggregates, Flooring, Homes

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

Arrowheads, As Dimension Stone, Cement Manufacture, Construction Aggregate, Cutting Tool, for Road Aggregate, Making natural cement, Production of Glass and Ceramics, Rail Track Ballast, Roadstone

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

Medical Industry

Antiquity Uses

Artifacts, Jewellery, Monuments, Sculpture

Artifacts

Other Uses

Commercial Uses

An Oil and Gas Reservoir, As armour rock for sea walls, Cemetery Markers, Commemorative Tablets, In aquifers, Laboratory bench tops, Petroleum reservoirs, Soil Conditioner, Source of Magnesia (MgO), Tombstones, Used in aquariums

Gemstone, Laboratory bench tops, Jewelry

Types

Orthoquartzite and Metaquartzite

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

Features

Generally rough to touch, 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

Quartzite forms from sandstone and the mineral quartz being put under extreme heat and pressure.

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

Chlorite, Epidote, Hematite, Kyanite, Magnetite, Muscovite or Illite, Quartz

Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz

Compound Content

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

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

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Hydrothermal Metamorphism, Regional Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion

Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

6-76-7

1 7

👆🏻

Grain Size

Medium Grained

Large and Coarse Grained

Fracture

Uneven, Splintery or Conchoidal

Sub-conchoidal

Streak

White

Porosity

Less Porous

Highly Porous

Luster

Vitreous

Earthy

Compressive Strength

115.00 N/mm²140.00 N/mm²

0.15 450

👆🏻

Cleavage

Indiscernible

Toughness

1.9

Specific Gravity

2.6-2.82.65-2.67

0 8.4

👆🏻

Transparency

Transparent to Translucent

Opaque

Density

2.32-2.42 g/cm³2.4-2.6 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.75 kJ/Kg K0.71 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Israel, Russia, South Korea, Thailand, Turkey

China, India

Africa

Ethiopia, Morocco, South Africa, Zimbabwe

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

Europe

England, Italy, Norway, Scotland, Sweden, United Kingdom

Germany, Iceland, Ireland, Italy, Spain

Others

Greenland

Deposits in Western Continents

North America

Bahamas, Canada, USA

Canada, USA

South America

Brazil, Colombia, Venezuela

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

Deposits in Oceania Continent

Australia

New Zealand, Queensland, Western Australia

All about Quartzite and Rhyolite Properties

Know all about Quartzite and Rhyolite properties here. All properties of rocks are important as they define the type of rock and its application. Quartzite belongs to Metamorphic Rocks while Rhyolite belongs to Igneous Rocks.Texture of Quartzite is Foliated, Granular whereas that of Rhyolite is Aphanitic, Glassy, Porphyritic. Quartzite appears Lustrous and Rhyolite appears Banded. The luster of Quartzite is vitreous while that of Rhyolite is earthy. Quartzite is available in black, blue, brown, green, light grey, purple, white, yellow colors whereas Rhyolite is available in grey, white, light black colors. The commercial uses of Quartzite are an oil and gas reservoir, as armour rock for sea walls, cemetery markers, commemorative tablets, in aquifers, laboratory bench tops, petroleum reservoirs, soil conditioner, source of magnesia (mgo), tombstones, used in aquariums and that of Rhyolite are gemstone, laboratory bench tops, jewelry.