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Websterite and Coquina


Coquina 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.   
Coquina is a sedimentary rock that is composed either wholly or almost entirely of the transported, abraded, and mechanically-sorted fragments of the shells of molluscs, trilobites, brachiopods, or other invertebrates   

History
  
  

Origin
Webster, North Carolina   
European Foreland Basins   

Discoverer
Unknown   
Unknown   

Etymology
From the town of Webster located in North Carolina   
From Concha (Latin)+ Coquina(Spanish) +conch(English)= Couquina (mid 19th century)   

Class
Igneous Rocks   
Sedimentary Rocks   

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

Family
  
  

Group
Plutonic   
Not Applicable   

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

Texture

Texture
Clastic, Granular, Phaneritic, Porphyritic   
Clastic   

Color
Black to Grey, Bluish - Grey, Dark Greenish - Grey, Green, Light Greenish Grey   
Beige, Buff, Orange   

Maintenance
Less   
More   

Durability
Durable   
Non-Durable   

Water Resistant
Yes   
No   

Scratch Resistant
Yes   
No   

Stain Resistant
Yes   
No   

Wind Resistant
Yes   
No   

Acid Resistant
Yes   
No   

Appearance
Layered, Banded, Veined and Shiny   
Layered, Banded, Veined and Shiny   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

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

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts   
Artifacts, Monuments, Sculpture, Small Figurines   

Other Uses
  
  

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

Types

Types
Not Available   
Not Available   

Features
Generally rough to touch, Is one of the oldest rock   
Available in Lots of Colors and Patterns, Is one of the oldest 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   
Present   

Formation

Formation
Websterite can be formed as cumulates in ultramafic intrusions by accumulation of pyroxene crystals at the base of the lava chamber.   
Coquina is a sedimentary rock which is formed when billions of small clam-like seashell, called Coquina, or cockleshell are die and hence are deposited, buried and turns into a rock when pressure is applied.   

Composition
  
  

Mineral Content
Amphibole, Augite, Bronzite, Chromite, Diopside, Enstatite, Garnet, Hornblende, Hypersthene, Magnetite, Pyroxene   
Apatite, Augite, Bronzite, Calcite, Chert, Chlorite, Clay Minerals, Epidote, Feldspar, Garnet, Micas, Muscovite or Illite   

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

Transformation
  
  

Metamorphism
Yes   
No   

Types of Metamorphism
Burial Metamorphism, Impact Metamorphism   
Not Applicable   

Weathering
Yes   
Yes   

Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering   
Biological 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, Wind Erosion   

Properties

Physical Properties
  
  

Hardness
7   
1-2   

Grain Size
Coarse Grained   
Coarse Grained   

Fracture
Uneven   
Irregular   

Streak
White, Greenish White or Grey   
White   

Porosity
Less Porous   
Highly Porous   

Luster
Dull to Vitreous to Submetallic   
Dull to Vitreous to Submetallic   

Cleavage
Irregular   
Not Available   

Toughness
Not Available   
Not Available   

Specific Gravity
3.2-3.5   
1.10-2.24   

Transparency
Opaque   
Opaque   

Density
3.1-3.6 g/cm3   
2.8-2.9 g/cm3   

Thermal Properties
  
  

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

Reserves

Deposits in Eastern Continents
  
  

Asia
India, Russia   
Not Yet Found   

Africa
South Africa   
Not Yet Found   

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

Others
Greenland   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
USA   

South America
Brazil, Colombia, Venezuela   
Not Yet Found   

Deposits in Oceania Continent
  
  

Australia
New Zealand, Queensland   
Not Yet Found   

Summary >>
<< Reserves

All about Websterite and Coquina Properties

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

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