Andesite

Felsite

Andesite and Felsite

Andesite

Felsite

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1 Definition

1.1 Definition

Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava

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

1.2 History

1.2.1 Origin

North America

Unknown

1.2.2 Discoverer

Unknown

1.4 Etymology

From Andes mountains, where it is found in abundance

From English feldspar and -ite

1.5 Class

Igneous Rocks

2.1.2 Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

2.2 Family

2.2.1 Group

Volcanic

2.3 Other Categories

Fine Grained Rock, Opaque Rock

3 Texture

3.1 Texture

Aphanitic to Porphyritic

Arborescent Patterned, Vitreous

3.2 Color

Bluish - Grey, Grey, Pink, Yellow

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

3.4 Maintenance

Less

3.5 Durability

Durable

3.5.2 Water Resistant

✔ ✘

3.7.2 Scratch Resistant

✔ ✘

4.1.1 Stain Resistant

✔ ✘

4.2.1 Wind Resistant

✔ ✘

4.3.2 Acid Resistant

✔ ✘

4.4 Appearance

Dull and Soft

Layered, Banded, Veined and Shiny

5 Uses

5.1 Architecture

5.1.1 Interior Uses

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration, Kitchens

Decorative Aggregates, Flooring, Interior Decoration

5.1.3 Exterior Uses

Office Buildings, Roof Tiles

Paving Stone, Garden Decoration

5.1.5 Other Architectural Uses

Curbing

5.2 Industry

5.2.1 Construction Industry

Cobblestones, Construction Aggregate, for Road Aggregate

Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points

5.2.3 Medical Industry

Not Yet Used

Surgery

5.3 Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts

5.4 Other Uses

5.4.1 Commercial Uses

Commemorative Tablets, Creating Artwork

Mirror, Jewelry

6 Types

6.1 Types

Icelandite

Not Available

6.3 Features

Generally rough to touch, High silica content, Is one of the oldest rock

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

6.4 Archaeological Significance

6.4.1 Monuments

Used

Not Yet Used

7.1.1 Famous Monuments

Middle of the Earth in Ecuador

Not Applicable

7.1.2 Sculpture

Used

Not Yet Used

7.2.2 Famous Sculptures

Data Not Available

Not Applicable

7.2.3 Pictographs

Not Used

Used

7.2.5 Petroglyphs

Not Used

Used

7.3.2 Figurines

Used

Not Yet Used

7.4 Fossils

Absent

8 Formation

8.1 Formation

Andesite is a fine-grained igneous rock that forms when the magma is erupted onto the surface and is crystallized quickly.

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.

8.2 Composition

8.2.1 Mineral Content

Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Ilmenite, Magnetite, Plagioclase, Pyroxene, Zircon

Feldspar, Iron Oxides

8.2.2 Compound Content

Silicon Dioxide

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

8.3 Transformation

8.3.1 Metamorphism

✔ ✘

8.3.2 Types of Metamorphism

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

Burial Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

8.3.3 Weathering

✔ ✘

8.3.5 Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

8.3.7 Erosion

✔ ✘

8.3.8 Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

Chemical Erosion, Glacier Erosion, Water Erosion

9 Properties

9.1 Physical Properties

9.1.1 Hardness

75-5.5

1 7

10.1.2 Grain Size

Very fine-grained

Fine Grained

10.1.3 Fracture

Uneven

Conchoidal

10.1.4 Streak

White

10.1.5 Porosity

Less Porous

Very Less Porous

10.1.6 Luster

Vitreous

10.1.7 Compressive Strength

225.00 N/mm²0.15 N/mm²

0.15 450

10.1.14 Cleavage

Not Available

Non-Existent

10.1.15 Toughness

1.1

Not Available

10.1.16 Specific Gravity

2.5-2.82.6-2.7

0 8.4

10.1.17 Transparency

Opaque

Translucent

10.1.18 Density

2.11-2.36 g/cm³2.6 g/cm³

0 1400

10.2 Thermal Properties

10.2.1 Specific Heat Capacity

2.39 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

10.2.4 Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Impact Resistant

11 Reserves

11.1 Deposits in Eastern Continents

11.1.1 Asia

India, Indonesia, Japan, Nepal, South Korea

Afghanistan, Indonesia, Japan, Russia

11.1.2 Africa

Egypt, Ethiopia, Morocco, Namibia, South Africa, Tanzania

Kenya

11.1.3 Europe

Austria, Finland, Germany, Italy, Romania, Turkey, United Kingdom

Greece, Hungary, Iceland, Italy, Turkey

11.1.4 Others

Not Yet Found

11.2 Deposits in Western Continents

11.2.1 North America

Mexico, USA

Canada, Mexico, USA

11.2.2 South America

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

Argentina, Chile, Ecuador, Peru

11.3 Deposits in Oceania Continent

11.3.1 Australia

New South Wales, New Zealand, Western Australia

New Zealand

All about Andesite and Felsite Properties

Know all about Andesite and Felsite properties here. All properties of rocks are important as they define the type of rock and its application. Andesite and Felsite belong to Igneous Rocks.Texture of Andesite is Aphanitic to Porphyritic whereas that of Felsite is Arborescent Patterned, Vitreous. Andesite appears Dull and Soft and Felsite appears Layered, Banded, Veined and Shiny. The luster of Andesite and Felsite is vitreous. Andesite is available in bluish - grey, grey, pink, yellow colors whereas Felsite is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Andesite are commemorative tablets, creating artwork and that of Felsite are mirror, jewelry.