Andesite

Diorite

Andesite and Diorite

Andesite

Diorite

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Definition

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

Diorite is a grey to dark-grey intermediate intrusive igneous rock composed principally of plagioclase feldspar,biotite, hornblende, and pyroxene

History

Origin

North America

Discoverer

Theodor von Gümbel

Unknown

Etymology

From Andes mountains, where it is found in abundance

From early 19th century coined in French, formed irregularly from Greek diorizein distinguish

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Volcanic

Plutonic

Other Categories

Fine Grained Rock, Opaque Rock

Coarse Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Phaneritic

Color

Bluish - Grey, Grey, Pink, Yellow

Black, Brown, Light to Dark Grey, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Soft

Shiny

Uses

Architecture

Interior Uses

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

Decorative Aggregates, Interior Decoration

Exterior Uses

Office Buildings, Roof Tiles

As Building Stone, As Facing Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

Cobblestones, Construction Aggregate, for Road Aggregate

As Dimension Stone, Cement Manufacture, Cobblestones, Construction Aggregate, for Road Aggregate

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Commemorative Tablets, Creating Artwork

Creating Artwork, Curling

Types

Icelandite

Plagioclase Diorite and Quartz Diorite

Features

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

Typically speckled black and white.

Archaeological Significance

Monuments

Famous Monuments

Middle of the Earth in Ecuador

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

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

Diorite is a coarse-grained intrusive igneous rock which contains large interlocking and randomly oriented crystals and forms when molten lava does not reach the Earth’s surface and cools down in the Earth’s crust.

Composition

Mineral Content

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

Albite, Amphibole, Apatite, Biotite, Feldspar, Hornblade, Ilmenite, Magnetite, Muscovite or Illite, Olivine, Plagioclase, Pyroxene, Quartz, Sulfides, Titanite, Zircon

Compound Content

Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

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

Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

Chemical Erosion, Coastal Erosion, Water Erosion

Properties

Physical Properties

Hardness

76-7

1 7

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Grain Size

Very fine-grained

Medium to Coarse Grained

Fracture

Uneven

Streak

White

Bluish Black

Porosity

Less Porous

Very Less Porous

Luster

Vitreous

Shiny

Compressive Strength

225.00 N/mm²225.00 N/mm²

0.15 450

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Cleavage

Toughness

1.1

2.1

Specific Gravity

2.5-2.82.8-3

0 8.4

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Transparency

Opaque

Density

2.11-2.36 g/cm³2.8-3 g/cm³

0 1400

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Thermal Properties

Specific Heat Capacity

2.39 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Indonesia, Japan, Nepal, South Korea

Africa

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

Egypt

Europe

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

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

Others

Deposits in Western Continents

North America

Mexico, USA

USA

South America

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

Argentina, Bolivia, Chile, Colombia, Ecuador, Peru

Deposits in Oceania Continent

Australia

New South Wales, New Zealand, Western Australia

New Zealand, Western Australia

All about Andesite and Diorite Properties

Know all about Andesite and Diorite properties here. All properties of rocks are important as they define the type of rock and its application. Andesite and Diorite belong to Igneous Rocks.Texture of Andesite is Aphanitic to Porphyritic whereas that of Diorite is Phaneritic. Andesite appears Dull and Soft and Diorite appears Shiny. The luster of Andesite is vitreous while that of Diorite is shiny. Andesite is available in bluish - grey, grey, pink, yellow colors whereas Diorite is available in black, brown, light to dark grey, white colors. The commercial uses of Andesite are commemorative tablets, creating artwork and that of Diorite are creating artwork, curling.