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Hornfels vs Blueschist


Blueschist vs Hornfels


Definition

Definition
Hornfels is a metamorphic rock formed by the contact between mudstone or other clay rich rock, and a hot igneous body, and represents a heat altered equivalent of the original rock   
Blueschist is a metamorphic rock which is generally blue in color and is formed under conditions of high pressure and low temperature   

History
  
  

Origin
New Zealand   
USA   

Discoverer
Unknown   
Edgar Bailey   

Etymology
From German which means hornstone   
From French schiste, Greek skhistos i.e. split   

Class
Metamorphic Rocks   
Metamorphic Rocks   

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

Family
  
  

Group
Not Applicable   
Not Applicable   

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

Texture

Texture
Granular, Platy   
Foliated   

Color
Brown, Dark Greenish - Grey, Green, Reddish Brown   
Blue, Bluish - Grey, Purple, Shades of Blue   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
No   

Scratch Resistant
No   
No   

Stain Resistant
No   
No   

Wind Resistant
No   
No   

Acid Resistant
No   
No   

Appearance
Dull   
Dull and Banded   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Not Yet Used   

Industry
  
  

Construction Industry
for Road Aggregate, Roadstone   
As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Monuments   
Artifacts, Monuments, Sculpture   

Other Uses
  
  

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

Types

Types
Biotite hornfels   
Not Available   

Features
Smooth to touch   
Has High structural resistance against erosion and climate, Very fine grained rock   

Archaeological Significance
  
  

Monuments
Used   
Used   

Famous Monuments
Data Not Available   
Data Not Available   

Sculpture
Not Yet Used   
Used   

Famous Sculptures
Not Applicable   
Data Not Available   

Pictographs
Used   
Used   

Petroglyphs
Used   
Used   

Figurines
Not Yet Used   
Used   

Fossils
Absent   
Absent   

Formation

Formation
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Hornfels is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.   
Blueschist forms due to the metamorphism of basalt and other rocks with similar composition at high pressures and low temperatures and approximately corresponding to a depth of 15 to 30 kilometers and 200 to 500 °C.   

Composition
  
  

Mineral Content
Andalusite   
Albite, Chlorite, Epidote, Garnet, Glaucophane, Lawsonite, Muscovite or Illite, Quartz   

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

Transformation
  
  

Metamorphism
No   
No   

Types of Metamorphism
Not Applicable   
Not Applicable   

Weathering
Yes   
Yes   

Types of Weathering
Biological Weathering   
Mechanical Weathering   

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
2-3   
3.5-4   

Grain Size
Fine Grained   
Fine to Medium Grained   

Fracture
Conchoidal   
Conchoidal   

Streak
Unknown   
White to Grey   

Porosity
Highly Porous   
Highly Porous   

Luster
Shiny   
Dull   

Compressive Strength
5.80 N/mm2   
31
Not Available   

Cleavage
Perfect   
Slaty   

Toughness
Not Yet Found   
1.5   

Specific Gravity
3.4-3.9   
3-3.2   

Transparency
Opaque   
Opaque   

Density
0.25-0.30 g/cm3   
2.8-2.9 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
0.84 kJ/Kg K   
15
Not Available   

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

Reserves

Deposits in Eastern Continents
  
  

Asia
Bangladesh, Bhutan, China, India, North Korea, Qatar, Russia, Saudi Arabia, South Korea, Thailand   
Japan, Turkey   

Africa
Cameroon, East Africa, Tanzania, Western Africa   
Egypt, Ethiopia, South Africa   

Europe
United Kingdom   
France, Greece, Iceland   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
USA   

South America
Bolivia, Brazil, Colombia, Ecuador   
Not Yet Found   

Deposits in Oceania Continent
  
  

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

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Hornfels vs Blueschist 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 Hornfels and Blueschist Reserves. Hornfels is a metamorphic rock formed by the contact between mudstone or other clay rich rock, and a hot igneous body, and represents a heat altered equivalent of the original rock. Blueschist is a metamorphic rock which is generally blue in color and is formed under conditions of high pressure and low temperature. 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 Hornfels vs Blueschist information and Hornfels vs Blueschist characteristics in the upcoming sections.

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Hornfels vs Blueschist 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. Hornfels vs Blueschist characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Hornfels and Properties of Blueschist. Learn more about Hornfels vs Blueschist in the next section. The interior uses of Hornfels include Decorative aggregates, Flooring, Homes and Interior decoration whereas the interior uses of Blueschist include Floor tiles, Flooring, Homes, Hotels and Kitchens. Due to some exceptional properties of Hornfels and Blueschist, they have various applications in construction industry. The uses of Hornfels in construction industry include For road aggregate, Roadstone and that of Blueschist include As dimension stone, Cobblestones, Rail track ballast, Roadstone.

More about Hornfels and Blueschist

Here you can know more about Hornfels and Blueschist. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Hornfels and Blueschist consists of mineral content and compound content. The mineral content of Hornfels includes Andalusite and mineral content of Blueschist includes Albite, Chlorite, Epidote, Garnet, Glaucophane, Lawsonite, Muscovite or Illite, Quartz. You can also check out the list of all Metamorphic Rocks. When we have to compare Hornfels vs Blueschist, the texture, color and appearance plays an important role in determining the type of rock. Hornfels is available in brown, dark greenish - grey, green, reddish brown colors whereas, Blueschist is available in blue, bluish - grey, purple, shades of blue colors. Appearance of Hornfels is Dull and that of Blueschist is Dull and Banded. Properties of rock is another aspect for Hornfels vs Blueschist. The hardness of Hornfels is 2-3 and that of Blueschist is 3.5-4. The types of Hornfels are Biotite hornfels whereas types of Blueschist are Not Available. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Hornfels is unknown while that of Blueschist is white to grey. The specific heat capacity of Hornfels is 0.84 kJ/Kg K and that of Blueschist is Not Available. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Hornfels is heat resistant, impact resistant, pressure resistant whereas Blueschist is impact resistant, pressure resistant.

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