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Andesite and Amphibolite


Amphibolite and Andesite


Definition

Definition
Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava   
Amphibolite can be defined as a granular metamorphic rock which mainly consist of hornblende and plagioclase   

History
  
  

Origin
North America   
Unknown   

Discoverer
Unknown   
Alexandre Brongniart   

Etymology
From Andes mountains, where it is found in abundance   
From Amphibole + -ite   

Class
Igneous Rocks   
Metamorphic Rocks   

Sub-Class
Durable Rock, Hard Rock   
Durable Rock, Hard Rock   

Family
  
  

Group
Volcanic   
Not Applicable   

Other Categories
Fine Grained Rock, Opaque Rock   
Coarse Grained Rock, Medium Grained Rock, Opaque Rock   

Texture

Texture
Aphanitic to Porphyritic   
Banded, Foliated, Massive   

Color
Bluish - Grey, Grey, Pink, Yellow   
Black, Brown, Green, Grey   

Maintenance
More   
Less   

Durability
Durable   
Durable   

Water Resistant
No   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
Yes   

Wind Resistant
No   
No   

Acid Resistant
Yes   
Yes   

Appearance
Dull and Soft   
Foliated   

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Floor Tiles, Homes, Interior Decoration, Kitchens   
Countertops, Decorative Aggregates, Entryways, Floor Tiles, Flooring, Homes, Hotels, Kitchens   

Exterior Uses
Office Buildings, Roof Tiles   
As Building Stone, As Facing Stone, Paving Stone, Office Buildings   

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
Cobblestones, Construction Aggregate, for Road Aggregate   
As Dimension Stone, Building houses or walls, Cobblestones, Construction Aggregate, for Road Aggregate, Landscaping, Production of Glass and Ceramics, Roadstone   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines   
Artifacts, Sculpture, Small Figurines   

Other Uses
  
  

Commercial Uses
Commemorative Tablets, Creating Artwork   
Cemetery Markers, Commemorative Tablets, Creating Artwork   

Types

Types
Icelandite   
Hornblendite   

Features
Generally rough to touch, High silica content, Is one of the oldest rock   
Clasts are smooth to touch, Matrix variable, Surfaces are often shiny   

Archaeological Significance
  
  

Monuments
Used   
Used   

Famous Monuments
Middle of the Earth in Ecuador   
Data Not Available   

Sculpture
Used   
Used   

Famous Sculptures
Data Not Available   
Data Not Available   

Pictographs
Not Used   
Not Used   

Petroglyphs
Not Used   
Not Used   

Figurines
Used   
Used   

Fossils
Absent   
Absent   

Formation

Formation
Andesite is a fine-grained igneous rock that forms when the magma is erupted onto the surface and is crystallized quickly.   
Amphibolite is a coarse-grained metamorphic rock which forms by metamorphism of mafic igneous rocks like basalt and gabbro or from the metamorphism of clay-rich sedimentary rocks like marl or graywacke.   

Composition
  
  

Mineral Content
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Ilmenite, Magnetite, Plagioclase, Pyroxene, Zircon   
Amphibole, Andalusite, Biotite, Calcite, Epidote, Garnet, Hornblade, Kyanite, Magnetite, Olivine, Plagioclase, Pyroxene, Staurolite, Wollastonite   

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

Transformation
  
  

Metamorphism
Yes   
No   

Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism   
Not Applicable   

Weathering
Yes   
Yes   

Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering   
Chemical Weathering, Mechanical Weathering   

Erosion
Yes   
Yes   

Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion   
Chemical Erosion, Glacier Erosion, Sea Erosion, Wind Erosion   

Properties

Physical Properties
  
  

Hardness
7   
6-7   

Grain Size
Very fine-grained   
Medium to Coarse Grained   

Fracture
Uneven   
Irregular to Conchoidal   

Streak
White   
White to Grey   

Porosity
Less Porous   
Less Porous   

Luster
Vitreous   
Vitreous to Dull   

Compressive Strength
225.00 N/mm2   
7
Not Available   

Cleavage
Not Available   
Irregular   

Toughness
1.1   
2.3   

Specific Gravity
2.5-2.8   
2.5   

Transparency
Opaque   
Opaque   

Density
2.11-2.36 g/cm3   
2.85-3.07 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
2.39 kJ/Kg K   
2
Not Available   

Resistance
Heat Resistant, Pressure Resistant, Wear Resistant   
Heat Resistant, Pressure Resistant, Wear Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
India, Indonesia, Japan, Nepal, South Korea   
Russia, Turkey   

Africa
Egypt, Ethiopia, Morocco, Namibia, South Africa, Tanzania   
Burundi, Djibouti, Eritrea, Ethiopia, Kenya, Madagascar, Rwanda, Somalia, South Africa, Sudan, Tanzania, Uganda   

Europe
Austria, Finland, Germany, Italy, Romania, Turkey, United Kingdom   
Germany, Greece, Iceland, Norway, Poland   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Mexico, USA   
Canada, USA   

South America
Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela   
Brazil   

Deposits in Oceania Continent
  
  

Australia
New South Wales, New Zealand, Western Australia   
South Australia, Western Australia   

Summary >>
<< Reserves

All about Andesite and Amphibolite Properties

Know all about Andesite and Amphibolite properties here. All properties of rocks are important as they define the type of rock and its application. Andesite belongs to Igneous Rocks while Amphibolite belongs to Metamorphic Rocks.Texture of Andesite is Aphanitic to Porphyritic whereas that of Amphibolite is Banded, Foliated, Massive. Andesite appears Dull and Soft and Amphibolite appears Foliated. The luster of Andesite is vitreous while that of Amphibolite is vitreous to dull. Andesite is available in bluish - grey, grey, pink, yellow colors whereas Amphibolite is available in black, brown, green, grey colors. The commercial uses of Andesite are commemorative tablets, creating artwork and that of Amphibolite are cemetery markers, commemorative tablets, creating artwork.

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