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Websterite and Adakite


Adakite and Websterite


Definition

Definition
Websterite is ultramafic and ultrabasic rock that consists of roughly equal proportions of orthopyroxene and clinopyroxene. It is a special type of pyroxenite.   
Adakite is an intermediate to felsic volcanic rock that has geochemical characteristics of magma which is said to be formed by partial melting of altered basalt that is subducted below volcanic arcs   

History
  
  

Origin
Webster, North Carolina   
Adak, Aleutian Islands   

Discoverer
Unknown   
Defant and Drummond   

Etymology
From the town of Webster located in North Carolina   
From Adak, Aleutian Islands   

Class
Igneous Rocks   
Igneous Rocks   

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

Family
  
  

Group
Plutonic   
Volcanic   

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

Texture

Texture
Clastic, Granular, Phaneritic, Porphyritic   
Porphyritic   

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

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
No   

Scratch Resistant
Yes   
No   

Stain Resistant
Yes   
No   

Wind Resistant
Yes   
Yes   

Acid Resistant
Yes   
Yes   

Appearance
Layered, Banded, Veined and Shiny   
Dull and Soft   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Whetstones   

Industry
  
  

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

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts   
Monuments, Sculpture, Small Figurines   

Other Uses
  
  

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

Types

Types
Not Available   
Not Available   

Features
Generally rough to touch, Is one of the oldest rock   
Has High structural resistance against erosion and climate, Host rock for Diamond, Very fine grained rock   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Used   

Famous Monuments
Data Not Available   
Data Not Available   

Sculpture
Not Yet Used   
Used   

Famous Sculptures
Data Not Available   
Data Not Available   

Pictographs
Not Used   
Used   

Petroglyphs
Not Used   
Used   

Figurines
Not Yet Used   
Used   

Fossils
Absent   
Absent   

Formation

Formation
Websterite can be formed as cumulates in ultramafic intrusions by accumulation of pyroxene crystals at the base of the lava chamber.   
Adakite rocks are formed when the hydrous fluids are released from minerals that break down in metamorphosed basalt, and rise into the mantle they initiate partial melting.   

Composition
  
  

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

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

Transformation
  
  

Metamorphism
Yes   
Yes   

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

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, Water Erosion, Wind Erosion   
Coastal Erosion, Sea Erosion, Water Erosion   

Properties

Physical Properties
  
  

Hardness
7   
3-4   

Grain Size
Coarse Grained   
Fine to Medium Grained   

Fracture
Uneven   
Conchoidal   

Streak
White, Greenish White or Grey   
Bluish Black   

Porosity
Less Porous   
Less Porous   

Luster
Dull to Vitreous to Submetallic   
Grainy, Pearly and Vitreous   

Cleavage
Irregular   
Not Available   

Toughness
Not Available   
Not Available   

Specific Gravity
3.2-3.5   
Not Available   

Transparency
Opaque   
Opaque   

Density
3.1-3.6 g/cm3   
Not Available   

Thermal Properties
  
  

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

Reserves

Deposits in Eastern Continents
  
  

Asia
India, Russia   
India, Russia   

Africa
South Africa   
Ethiopia, Somalia, South Africa   

Europe
Germany, Greece, Italy, Scotland, Turkey   
Iceland   

Others
Greenland   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
Canada, USA   

South America
Brazil, Colombia, Venezuela   
Brazil   

Deposits in Oceania Continent
  
  

Australia
New Zealand, Queensland   
Not Yet Found   

Summary >>
<< Reserves

All about Websterite and Adakite Properties

Know all about Websterite and Adakite properties here. All properties of rocks are important as they define the type of rock and its application. Websterite and Adakite belong to Igneous Rocks.Texture of Websterite is Clastic, Granular, Phaneritic, Porphyritic whereas that of Adakite is Porphyritic. Websterite appears Layered, Banded, Veined and Shiny and Adakite appears Dull and Soft. The luster of Websterite is dull to vitreous to submetallic while that of Adakite is grainy, pearly and vitreous. Websterite is available in black to grey, bluish - grey, dark greenish - grey, green, light greenish grey colors whereas Adakite is available in black, brown, light to dark grey colors. The commercial uses of Websterite are cemetery markers, commemorative tablets, creating artwork, laboratory bench tops, jewelry, sea defence, tombstones and that of Adakite are commemorative tablets, pottery, used in aquariums.

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