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Porphyry vs Greenschist


Greenschist vs Porphyry


Definition

Definition
Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix   
Greenschist is a metamorphic rock that is formed under lowest temperatures and pressures and is usually produced by regional metamorphism   

History
  
  

Origin
Egypt   
Unknown   

Discoverer
Unknown   
Unknown   

Etymology
From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites   
From minerals such as chlorite, serpentine, and epidote, and platy minerals such as muscovite and platy serpentine which are green in color   

Class
Igneous Rocks   
Metamorphic Rocks   

Sub-Class
Durable Rock, Hard Rock   
Durable Rock, Medium Hardness Rock   

Family
  
  

Group
Plutonic   
Not Applicable   

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

Texture

Texture
Porphyritic   
Foliated, Platy   

Color
Black, Brown, Colourless, Green, Grey, Red, Rust, White   
Dark Greenish - Grey, Green   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
No   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
No   

Wind Resistant
No   
No   

Acid Resistant
Yes   
No   

Appearance
Dull   
Layered and Shiny   

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Interior Decoration   
Bathrooms, Countertops, Decorative Aggregates, Entryways, Homes, Interior Decoration   

Exterior Uses
Garden Decoration, Paving Stone   
As Building Stone, As Facing Stone, Paving Stone, Garden Decoration, Office Buildings   

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
Construction Aggregate   
As Dimension Stone, Building houses or walls, Cement Manufacture, Cutting Tool, for Road Aggregate, Roadstone   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Monuments, Sculpture   
Artifacts   

Other Uses
  
  

Commercial Uses
Creating Artwork, Gemstone, Jewelry   
Blackboards, Manufacture of tools, Writing Slates   

Types

Types
Rhomb Porphyry   
Not Available   

Features
Generally rough to touch, Is one of the oldest rock, Surfaces are often shiny   
Easily splits into thin plates, Smooth to touch   

Archaeological Significance
  
  

Monuments
Used   
Not Yet Used   

Famous Monuments
Data Not Available   
Not Applicable   

Sculpture
Used   
Not Yet Used   

Famous Sculptures
Data Not Available   
Not Applicable   

Pictographs
Not Used   
Used   

Petroglyphs
Not Used   
Used   

Figurines
Used   
Not Yet Used   

Fossils
Absent   
Absent   

Formation

Formation
Porphyry is formed in two stages: the magma cools slowly deep within the crust or the magma is cools rapidly as it erupts from a volcano, creating small grains that are usually invisible to naked eye.   
Greenschist is medium grade metamorphic rock, formed by the metamorphosis of mudstone or shale, or some types of igneous rock, when it is subjected to higher temperatures and pressures.   

Composition
  
  

Mineral Content
Biotite, Chert, Feldspar, Garnet, Graphite, Quartz, Silica   
Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Serpentine, Sillimanite, Staurolite, Talc   

Compound Content
Aluminium Oxide, CaO, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Titanium Dioxide   
CaO, Carbon Dioxide, MgO   

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, Not Registered   
Biological Weathering, Chemical Weathering   

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
6-7   
3.5-4   

Grain Size
Fine Grained   
Medium to Fine Coarse Grained   

Fracture
Irregular   
Conchoidal   

Streak
White   
White   

Porosity
Less Porous   
Highly Porous   

Luster
Dull   
Shiny   

Cleavage
Imperfect   
Slaty   

Toughness
1.7   
1.5   

Specific Gravity
2.5-4   
2.5-2.9   

Transparency
Translucent to Opaque   
Opaque   

Density
2.5-2.52 g/cm3   
2.8-2.9 g/cm3   

Thermal Properties
  
  

Resistance
Heat Resistant, Impact Resistant   
Impact Resistant, Pressure Resistant, Water Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
China, Kazakhstan, South Korea, Thailand, Turkey, Vietnam   
Afghanistan, Bangladesh, Bhutan, China, India, Japan, Kazakhstan, Malaysia, Pakistan, Russia, Thailand, Turkey, Vietnam   

Africa
Egypt, Ethiopia, Ghana, South Africa   
Egypt, Ethiopia, Morocco, Nigeria, South Africa   

Europe
Finland, France, Germany, Great Britain, Hungary, Iceland, Ireland, Italy, Netherlands, Norway, Romania, Sweden, Switzerland   
Austria, England, France, Georgia, Germany, Italy, Liechtenstein, Monaco, Norway, Slovenia, Spain, Sweden, Switzerland   

Others
Greenland   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, Cuba, Jamaica, USA   
Canada, Costa Rica, Cuba, Mexico, Panama, USA   

South America
Bolivia, Brazil, Colombia, Ecuador, Paraguay   
Brazil, Colombia, Guyana   

Deposits in Oceania Continent
  
  

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

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Porphyry vs Greenschist Information

Earth’s outer layer is covered by rocks and these rocks have different physical and chemical properties. As two rocks are not same, it’s fun to compare them. You can also know more about Porphyry and Greenschist Reserves. Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix. Greenschist is a metamorphic rock that is formed under lowest temperatures and pressures and is usually produced by regional metamorphism. These rocks are composed of many distinct minerals. The process of formation of rocks is different for various rocks. Rocks are quarried from many years for various purposes. You can check out Porphyry vs Greenschist information and Porphyry vs Greenschist characteristics in the upcoming sections.

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Porphyry vs Greenschist Characteristics

Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Porphyry vs Greenschist characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Porphyry and Properties of Greenschist. Learn more about Porphyry vs Greenschist in the next section. The interior uses of Porphyry include Decorative aggregates and Interior decoration whereas the interior uses of Greenschist include Bathrooms, Countertops, Decorative aggregates, Entryways, Homes and Interior decoration. Due to some exceptional properties of Porphyry and Greenschist, they have various applications in construction industry. The uses of Porphyry in construction industry include Construction aggregate and that of Greenschist include As dimension stone, Building houses or walls, Cement manufacture, Cutting tool, For road aggregate, Roadstone.

More about Porphyry and Greenschist

Here you can know more about Porphyry and Greenschist. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Porphyry and Greenschist consists of mineral content and compound content. The mineral content of Porphyry includes Biotite, Chert, Feldspar, Garnet, Graphite, Quartz, Silica and mineral content of Greenschist includes Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Serpentine, Sillimanite, Staurolite, Talc. You can also check out the list of all Igneous Rocks. When we have to compare Porphyry vs Greenschist, the texture, color and appearance plays an important role in determining the type of rock. Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors whereas, Greenschist is available in dark greenish - grey, green colors. Appearance of Porphyry is Dull and that of Greenschist is Layered and Shiny. Properties of rock is another aspect for Porphyry vs Greenschist. The hardness of Porphyry is 6-7 and that of Greenschist is 3.5-4. The types of Porphyry are Rhomb Porphyry whereas types of Greenschist are Not Available. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Porphyry and Greenschist is white. The specific heat capacity of Porphyry is Not Available and that of Greenschist is Not Available. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Porphyry is heat resistant, impact resistant whereas Greenschist is impact resistant, pressure resistant, water resistant.

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