Felsite

Rhyolite

Felsite and Rhyolite

Felsite

Rhyolite

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Definition

Felsite is a very fine grained volcanic rock that may or may not contain larger crystals and light colored rock that typically requires petrographic examination or chemical analysis for more precise definition

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

History

Origin

North America

Discoverer

Unknown

Ferdinand von Richthofen

Etymology

From English feldspar and -ite

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

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Coarse Grained Rock, Opaque Rock

Texture

Arborescent Patterned, Vitreous

Aphanitic, Glassy, Porphyritic

Color

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

Grey, White, Light Black

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Layered, Banded, Veined and Shiny

Banded

Uses

Architecture

Interior Uses

Decorative Aggregates, Flooring, Interior Decoration

Decorative Aggregates, Homes, Hotels, Interior Decoration, Kitchens

Exterior Uses

Paving Stone, Garden Decoration

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

Other Architectural Uses

Curbing

Industry

Construction Industry

Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points

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

Medical Industry

Surgery

Antiquity Uses

Artifacts

Other Uses

Commercial Uses

Mirror, Jewelry

Gemstone, Laboratory bench tops, Jewelry

Types

Igneous rock

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

Features

Available in Lots of Colors and Patterns, Clasts are smooth to touch, Splintery, Very fine grained rock

Acidic in nature, Available in lots of colors

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Felsite 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.

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

Feldspar, Iron Oxides

Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz

Compound Content

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

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

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Contact Metamorphism, Impact 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, Glacier Erosion, Water Erosion

Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

5-5.56-7

1 7

👆🏻

Grain Size

Fine Grained

Large and Coarse Grained

Fracture

Conchoidal

Sub-conchoidal

Streak

White

Porosity

Very Less Porous

Highly Porous

Luster

Vitreous

Earthy

Compressive Strength

0.15 N/mm²140.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

Specific Gravity

2.6-2.72.65-2.67

0 8.4

👆🏻

Transparency

Translucent

Opaque

Density

2.6 g/cm³2.4-2.6 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K0.71 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant

Heat Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Afghanistan, Indonesia, Japan, Russia

China, India

Africa

Kenya

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

Europe

Greece, Hungary, Iceland, Italy, Turkey

Germany, Iceland, Ireland, Italy, Spain

Others

Deposits in Western Continents

North America

Canada, Mexico, USA

Canada, USA

South America

Argentina, Chile, Ecuador, Peru

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

Deposits in Oceania Continent

Australia

New Zealand

New Zealand, Queensland, Western Australia

All about Felsite and Rhyolite Properties

Know all about Felsite and Rhyolite properties here. All properties of rocks are important as they define the type of rock and its application. Felsite and Rhyolite belong to Igneous Rocks.Texture of Felsite is Arborescent Patterned, Vitreous whereas that of Rhyolite is Aphanitic, Glassy, Porphyritic. Felsite appears Layered, Banded, Veined and Shiny and Rhyolite appears Banded. The luster of Felsite is vitreous while that of Rhyolite is earthy. Felsite is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Rhyolite is available in grey, white, light black colors. The commercial uses of Felsite are mirror, jewelry and that of Rhyolite are gemstone, laboratory bench tops, jewelry.