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Coquina and Diabase


Diabase and Coquina


Definition

Definition
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   
Diabase is a fine-grained igneous rock which is composed mostly of pyroxene and feldspar   

History
  
  

Origin
European Foreland Basins   
Germany   

Discoverer
Unknown   
Christian Leopold von Buch   

Etymology
From Concha (Latin)+ Coquina(Spanish) +conch(English)= Couquina (mid 19th century)   
From Greek di + base   

Class
Sedimentary Rocks   
Igneous Rocks   

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

Family
  
  

Group
Not Applicable   
Volcanic   

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

Texture

Texture
Clastic   
Aphanitic, Granular   

Color
Beige, Buff, Orange   
Dark Grey to Black   

Maintenance
More   
Less   

Durability
Non-Durable   
Durable   

Water Resistant
No   
Yes   

Scratch Resistant
No   
Yes   

Stain Resistant
No   
Yes   

Wind Resistant
No   
Yes   

Acid Resistant
No   
Yes   

Appearance
Layered, Banded, Veined and Shiny   
Vesicular   

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Homes, Hotels, Interior Decoration   
Countertops, Decorative Aggregates, Homes, Interior Decoration, Kitchens   

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

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

Medical Industry
Not Yet Used   
Not Yet Used   

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

Other Uses
  
  

Commercial Uses
Creating Artwork   
An Oil and Gas Reservoir, Cemetery Markers, Commemorative Tablets, Laboratory bench tops, Jewelry, Sea Defence, Tombstones   

Types

Types
Not Available   
Not Available   

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

Archaeological Significance
  
  

Monuments
Used   
Used   

Famous Monuments
Data Not Available   
Stonehenge in English county of Wiltshire   

Sculpture
Used   
Used   

Famous Sculptures
Data Not Available   
Data Not Available   

Pictographs
Used   
Not Used   

Petroglyphs
Used   
Not Used   

Figurines
Used   
Used   

Fossils
Present   
Absent   

Formation

Formation
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.   
Diabase forms when molten igneous rock is squeezed up into a vertical crack in other rocks, the crack is usually forced apart and the molten rock cools in the space to form a tabular igneous intrusion cutting across the surrounding rocks and is known as a dike.   

Composition
  
  

Mineral Content
Apatite, Augite, Bronzite, Calcite, Chert, Chlorite, Clay Minerals, Epidote, Feldspar, Garnet, Micas, Muscovite or Illite   
Augite, Chlorite, Olivine, Plagioclase, Pyroxene, Pyrrhotite, Serpentine   

Compound Content
CaO, Carbon Dioxide, Iron(III) Oxide, MgO   
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
Not Applicable   
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism   

Weathering
Yes   
Yes   

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

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
1-2   
7   

Grain Size
Coarse Grained   
Fine to Medium Grained   

Fracture
Irregular   
Conchoidal   

Streak
White   
Black   

Porosity
Highly Porous   
Highly Porous   

Luster
Dull to Vitreous to Submetallic   
Not Available   

Compressive Strength
Not Available   
225.00 N/mm2   
7

Cleavage
Not Available   
Not Available   

Toughness
Not Available   
1.6   

Specific Gravity
1.10-2.24   
2.86-2.87   

Transparency
Opaque   
Opaque   

Density
2.8-2.9 g/cm3   
2.7-3.3 g/cm3   

Thermal Properties
  
  

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

Reserves

Deposits in Eastern Continents
  
  

Asia
Not Yet Found   
India   

Africa
Not Yet Found   
South Africa, Tanzania   

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

Others
Not Yet Found   
Antarctica, Greenland   

Deposits in Western Continents
  
  

North America
USA   
Canada, USA   

South America
Not Yet Found   
Argentina, Brazil, Colombia, Venezuela   

Deposits in Oceania Continent
  
  

Australia
Not Yet Found   
Central Australia, New Zealand, Queensland, Western Australia   

Summary >>
<< Reserves

All about Coquina and Diabase Properties

Know all about Coquina and Diabase properties here. All properties of rocks are important as they define the type of rock and its application. Coquina belongs to Sedimentary Rocks while Diabase belongs to Igneous Rocks.Texture of Coquina is Clastic whereas that of Diabase is Aphanitic, Granular. Coquina appears Layered, Banded, Veined and Shiny and Diabase appears Vesicular. The luster of Coquina is dull to vitreous to submetallic while that of Diabase is not available. Coquina is available in beige, buff, orange colors whereas Diabase is available in dark grey to black colors. The commercial uses of Coquina are creating artwork and that of Diabase are an oil and gas reservoir, cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones.

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