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Hornfels vs Websterite


Websterite 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  
Websterite is ultramafic and ultrabasic rock that consists of roughly equal proportions of orthopyroxene and clinopyroxene. It is a special type of pyroxenite.  

History
  
  

Origin
New Zealand  
Webster, North Carolina  

Discoverer
Unknown  
Unknown  

Etymology
From German which means hornstone  
From the town of Webster located in North Carolina  

Class
Metamorphic Rocks  
Igneous Rocks  

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

Family
  
  

Group
-  
Plutonic  

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

Texture

Texture
Granular, Platy  
Clastic, Granular, Phaneritic, Porphyritic  

Color
Brown, Dark Greenish - Grey, Green, Reddish Brown  
Black to Grey, Bluish - Grey, Dark Greenish - Grey, Green, Light Greenish Grey  

Maintenance
Less  
Less  

Durability
Durable  
Durable  

Water Resistant
Yes  
Yes  

Scratch Resistant
No  
Yes  

Stain Resistant
No  
Yes  

Wind Resistant
No  
Yes  

Acid Resistant
No  
Yes  

Appearance
Dull  
Layered, Banded, Veined and Shiny  

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing  
Curbing  

Industry
  
  

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

Medical Industry
-  
-  

Antiquity Uses
Artifacts, Monuments  
Artifacts  

Other Uses
  
  

Commercial Uses
Cemetery Markers, Commemorative Tablets, Creating Artwork  
Cemetery Markers, Commemorative Tablets, Creating Artwork, Laboratory bench tops, Jewelry, Sea Defence, Tombstones  

Types

Types
Biotite hornfels  
Ultramafic rock  

Features
Smooth to touch  
Generally rough to touch, Is one of the oldest rock  

Archaeological Significance
  
  

Monuments
-  
-  

Famous Monuments
-  
-  

Sculpture
-  
-  

Famous Sculptures
-  
-  

Pictographs
-  
-  

Petroglyphs
-  
-  

Figurines
-  
-  

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.  
Websterite can be formed as cumulates in ultramafic intrusions by accumulation of pyroxene crystals at the base of the lava chamber.  

Composition
  
  

Mineral Content
Andalusite  
Amphibole, Augite, Bronzite, Chromite, Diopside, Enstatite, Garnet, Hornblende, Hypersthene, Magnetite, Pyroxene  

Compound Content
Fe, Mg  
Aluminium Oxide, CaO, Chromium(III) Oxide, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Sulfur Trioxide  

Transformation
  
  

Metamorphism
No  
Yes  

Types of Metamorphism
-  
Burial Metamorphism, Impact Metamorphism  

Weathering
Yes  
Yes  

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

Erosion
Yes  
Yes  

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

Properties

Physical Properties
  
  

Hardness
2-3  
7  

Grain Size
Fine Grained  
Coarse Grained  

Fracture
Conchoidal  
Uneven  

Streak
-  
White, Greenish White or Grey  

Porosity
Highly Porous  
Less Porous  

Luster
Shiny  
Dull to Vitreous to Submetallic  

Compressive Strength
5.80 N/mm2  
99+
95.00 N/mm2  
30

Cleavage
Perfect  
-  

Toughness
-  
-  

Specific Gravity
3.4-3.9  
3.2-3.5  

Transparency
Opaque  
Opaque  

Density
0.25-0.30 g/cm3  
3.1-3.6 g/cm3  

Thermal Properties
  
  

Specific Heat Capacity
0.84 kJ/Kg K  
15
0.79 kJ/Kg K  
17

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

Reserves

Deposits in Eastern Continents
  
  

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

Africa
Cameroon, East Africa, Tanzania, Western Africa  
South Africa  

Europe
United Kingdom  
Germany, Greece, Italy, Scotland, Turkey  

Others
-  
Greenland  

Deposits in Western Continents
  
  

North America
Canada, USA  
Canada, USA  

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

Deposits in Oceania Continent
  
  

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

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Hornfels vs Websterite 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 Websterite 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. Websterite is ultramafic and ultrabasic rock that consists of roughly equal proportions of orthopyroxene and clinopyroxene. It is a special type of pyroxenite.. 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 Websterite information and Hornfels vs Websterite characteristics in the upcoming sections.

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Hornfels vs Websterite 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 Websterite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Hornfels and Properties of Websterite. Learn more about Hornfels vs Websterite in the next section. The interior uses of Hornfels include Decorative aggregates, Flooring, Homes and Interior decoration whereas the interior uses of Websterite include Countertops, Decorative aggregates, Entryways, Floor tiles, Flooring and Interior decoration. Due to some exceptional properties of Hornfels and Websterite, they have various applications in construction industry. The uses of Hornfels in construction industry include For road aggregate, Roadstone and that of Websterite include As dimension stone, Building houses or walls, Cement manufacture, Construction aggregate, For road aggregate.

More about Hornfels and Websterite

Here you can know more about Hornfels and Websterite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Hornfels and Websterite consists of mineral content and compound content. The mineral content of Hornfels includes Andalusite and mineral content of Websterite includes Amphibole, Augite, Bronzite, Chromite, Diopside, Enstatite, Garnet, Hornblende, Hypersthene, Magnetite, Pyroxene. You can also check out the list of all Metamorphic Rocks. When we have to compare Hornfels vs Websterite, 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, Websterite is available in black to grey, bluish - grey, dark greenish - grey, green, light greenish grey colors. Appearance of Hornfels is Dull and that of Websterite is Layered, Banded, Veined and Shiny. Properties of rock is another aspect for Hornfels vs Websterite. The hardness of Hornfels is 2-3 and that of Websterite is 7. The types of Hornfels are Biotite hornfels whereas types of Websterite are Ultramafic rock. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Hornfels is while that of Websterite is white, greenish white or grey. The specific heat capacity of Hornfels is 0.84 kJ/Kg K and that of Websterite is 0.79 kJ/Kg K. 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 Websterite is impact resistant, pressure resistant, wear resistant.

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