Andesite

Argillite

Andesite and Argillite

Andesite

Argillite

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Definition

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

Argillites are highly compact sedimentary or slightly metamorphosed rocks that consist largely or wholly of particles of clay or silt but lack the fissility of shale or the cleavage characteristic of slate

History

Origin

North America

Discoverer

Theodor von Gümbel

Unknown

Etymology

From Andes mountains, where it is found in abundance

From Latin Argilla (clay) and -ite in English which became agrilla+ -ite = Argillite

Class

Igneous Rocks

Sedimentary Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Soft Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Clastic, Polished

Color

Bluish - Grey, Grey, Pink, Yellow

Dark Grey to Black, Pink, Red, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Soft

Rough and Dull

Uses

Architecture

Interior Uses

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

Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

Office Buildings, Roof Tiles

As Building Stone, Garden Decoration, Office Buildings

Other Architectural Uses

Curbing

Curbing, Whetstones

Industry

Construction Industry

Cobblestones, Construction Aggregate, for Road Aggregate

Used for flooring, stair treads, borders and window sills.

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

Commemorative Tablets, Creating Artwork

Fire resistant, Used to manufracture paperweights and bookends

Types

Icelandite

Metamorphic rock

Features

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

Is one of the oldest rock

Archaeological Significance

Monuments

Famous Monuments

Middle of the Earth in Ecuador

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Present

Formation

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

An argillite is a fine-grained sedimentary rock mainly composed of clay particles which forms from lithified muds which contain variable amounts of silt-sized particles.

Composition

Mineral Content

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

Biotite, Chlorite, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyrite, Quartz

Compound Content

Silicon Dioxide

Iron(III) Oxide, Potassium Oxide, MgO, Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

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

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

Chemical Erosion

Properties

Physical Properties

Hardness

72-3

1 7

👆🏻

Grain Size

Very fine-grained

Fine Grained

Fracture

Uneven

Conchoidal to Uneven

Streak

White

White to Grey

Porosity

Less Porous

Highly Porous

Luster

Vitreous

Waxy and Dull

Compressive Strength

225.00 N/mm²-

0.15 450

👆🏻

Cleavage

Slaty

Toughness

1.1

2.6

Specific Gravity

2.5-2.82.56-2.68

0 8.4

👆🏻

Transparency

Opaque

Density

2.11-2.36 g/cm³2.54-2.66 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

2.39 kJ/Kg K0.87 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Indonesia, Japan, Nepal, South Korea

Bangladesh, China, India, Russia

Africa

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

Ethiopia, Kenya, Morocco, South Africa, Tanzania

Europe

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

Austria, France, Germany, Greece, Italy, Romania, Scotland, Spain, Switzerland

Others

Deposits in Western Continents

North America

Mexico, USA

USA

South America

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

Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela

Deposits in Oceania Continent

Australia

New South Wales, New Zealand, Western Australia

New South Wales, New Zealand, Queensland, Victoria, Western Australia

All about Andesite and Argillite Properties

Know all about Andesite and Argillite properties here. All properties of rocks are important as they define the type of rock and its application. Andesite belongs to Igneous Rocks while Argillite belongs to Sedimentary Rocks.Texture of Andesite is Aphanitic to Porphyritic whereas that of Argillite is Clastic, Polished. Andesite appears Dull and Soft and Argillite appears Rough and Dull. The luster of Andesite is vitreous while that of Argillite is waxy and dull. Andesite is available in bluish - grey, grey, pink, yellow colors whereas Argillite is available in dark grey to black, pink, red, white colors. The commercial uses of Andesite are commemorative tablets, creating artwork and that of Argillite are fire resistant, used to manufracture paperweights and bookends.