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Pegmatite vs Argillite


Argillite vs Pegmatite


Definition

Definition
Pegmatite rock is a holocrystalline, intrusive igneous rock which is composed of interlocking phaneritic crystals  
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
-  
-  

Discoverer
R. J. Hauy  
Unknown  

Etymology
From Greek pegma, pegmat which means- thing joined together + -ite  
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
Plutonic  
-  

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

Texture

Texture
Pegmatitic  
Clastic, Polished  

Color
Black, Brown, Cream, Green, Grey, Pink, Red, Rust, Silver, White, Yellow  
Dark Grey to Black, Pink, Red, White  

Maintenance
Less  
Less  

Durability
Durable  
Durable  

Water Resistant
Yes  
No  

Scratch Resistant
Yes  
Yes  

Stain Resistant
Yes  
Yes  

Wind Resistant
No  
Yes  

Acid Resistant
No  
Yes  

Appearance
Layered, Banded, Veined and Shiny  
Rough and Dull  

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Flooring, Interior Decoration  
Decorative Aggregates, Homes, Interior Decoration  

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

Other Architectural Uses
Curbing  
Curbing, Whetstones  

Industry
  
  

Construction Industry
As Dimension Stone, Building houses or walls, Construction Aggregate, for Road Aggregate, Landscaping  
Used for flooring, stair treads, borders and window sills.  

Medical Industry
-  
-  

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

Other Uses
  
  

Commercial Uses
Creating Artwork, Jewelry, Source of corundum, tourmalines, beryls and topaz  
Fire resistant, Used to manufracture paperweights and bookends  

Types

Types
Granite Pegmatite, Gabbro Pegmatite and Diorite Pegmatite  
Metamorphic rock  

Features
Generally rough to touch, Is one of the oldest rock, Source of corundum, tourmalines, beryls and topaz  
Is one of the oldest rock  

Archaeological Significance
  
  

Monuments
-  
-  

Famous Monuments
-  
-  

Sculpture
-  
-  

Famous Sculptures
-  
-  

Pictographs
-  
-  

Petroglyphs
-  
-  

Figurines
-  
-  

Fossils
Absent  
Present  

Formation

Formation
Pegmatite rock is holocrystalline, intrusive igneous rock which is formed by partial melting and dewatering during the process of metamorphism.  
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
Apatite, Beryl, Feldspar, Fluorite, Garnet, Lepidolite, Quartz, Silica, Spodumene, Topaz  
Biotite, Chlorite, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyrite, Quartz  

Compound Content
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, Magnesium Carbonate, MgO, Phosphorus Pentoxide  
Iron(III) Oxide, Potassium Oxide, MgO, Silicon Dioxide  

Transformation
  
  

Metamorphism
Yes  
No  

Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism  
-  

Weathering
Yes  
Yes  

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

Erosion
Yes  
Yes  

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

Properties

Physical Properties
  
  

Hardness
7  
2-3  

Grain Size
Medium to Coarse Grained  
Fine Grained  

Fracture
Conchoidal  
Conchoidal to Uneven  

Streak
White  
White to Grey  

Porosity
Less Porous  
Highly Porous  

Luster
Grainy, Pearly and Vitreous  
Waxy and Dull  

Compressive Strength
178.54 N/mm2  
19
-  

Cleavage
Perfect  
Slaty  

Toughness
2.1  
2.6  

Specific Gravity
2.6-2.63  
2.56-2.68  

Transparency
Translucent to Opaque  
Opaque  

Density
2.6-2.65 g/cm3  
2.54-2.66 g/cm3  

Thermal Properties
  
  

Specific Heat Capacity
0.79 kJ/Kg K  
17
0.87 kJ/Kg K  
14

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

Reserves

Deposits in Eastern Continents
  
  

Asia
China, India, Iran, Japan, Nepal, North Korea, Russia, Saudi Arabia, South Korea  
Bangladesh, China, India, Russia  

Africa
South Africa  
Ethiopia, Kenya, Morocco, South Africa, Tanzania  

Europe
Austria, France, Greece, Ireland, Italy, Netherlands, Slovakia, Spain, Turkey, Ukraine  
Austria, France, Germany, Greece, Italy, Romania, Scotland, Spain, Switzerland  

Others
-  
-  

Deposits in Western Continents
  
  

North America
Canada  
USA  

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

Deposits in Oceania Continent
  
  

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

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Pegmatite vs Argillite 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 Pegmatite and Argillite Reserves. Pegmatite rock is a holocrystalline, intrusive igneous rock which is composed of interlocking phaneritic crystals. 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. 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 Pegmatite vs Argillite information and Pegmatite vs Argillite characteristics in the upcoming sections.

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Pegmatite vs Argillite 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. Pegmatite vs Argillite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Pegmatite and Properties of Argillite. Learn more about Pegmatite vs Argillite in the next section. The interior uses of Pegmatite include Decorative aggregates, Flooring and Interior decoration whereas the interior uses of Argillite include Decorative aggregates, Homes and Interior decoration. Due to some exceptional properties of Pegmatite and Argillite, they have various applications in construction industry. The uses of Pegmatite in construction industry include As dimension stone, Building houses or walls, Construction aggregate, For road aggregate, Landscaping and that of Argillite include Used for flooring, stair treads, borders and window sills..

More about Pegmatite and Argillite

Here you can know more about Pegmatite and Argillite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Pegmatite and Argillite consists of mineral content and compound content. The mineral content of Pegmatite includes Apatite, Beryl, Feldspar, Fluorite, Garnet, Lepidolite, Quartz, Silica, Spodumene, Topaz and mineral content of Argillite includes Biotite, Chlorite, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyrite, Quartz. You can also check out the list of all Igneous Rocks. When we have to compare Pegmatite vs Argillite, the texture, color and appearance plays an important role in determining the type of rock. Pegmatite is available in black, brown, cream, green, grey, pink, red, rust, silver, white, yellow colors whereas, Argillite is available in dark grey to black, pink, red, white colors. Appearance of Pegmatite is Layered, Banded, Veined and Shiny and that of Argillite is Rough and Dull. Properties of rock is another aspect for Pegmatite vs Argillite. The hardness of Pegmatite is 7 and that of Argillite is 2-3. The types of Pegmatite are Granite Pegmatite, Gabbro Pegmatite and Diorite Pegmatite whereas types of Argillite are Metamorphic rock. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Pegmatite is white while that of Argillite is white to grey. The specific heat capacity of Pegmatite is 0.79 kJ/Kg K and that of Argillite is 0.87 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Pegmatite is heat resistant, impact resistant, pressure resistant whereas Argillite is heat resistant, impact resistant.

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