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Shale vs Coquina


Coquina vs Shale


Definition

Definition
Shale is a fine-grained sedimentary rock which is formed by the compaction of silt and clay-size mineral particles  
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
-  
European Foreland Basins  

Discoverer
Johann Gottlob Lehmann  
Unknown  

Etymology
From German Schalstein laminated limestone, and Schalgebirge layer of stone in stratified rock. From Old English scealu in its base sense of- thing that divides or separate,  
From Concha (Latin)+ Coquina(Spanish) +conch(English)= Couquina (mid 19th century)  

Class
Sedimentary Rocks  
Sedimentary Rocks  

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

Family
  
  

Group
-  
-  

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

Texture

Texture
Clastic, Splintery  
Clastic  

Color
Black, Brown, Buff, Green, Grey, Red, Yellow  
Beige, Buff, Orange  

Maintenance
More  
More  

Durability
Durable  
Non-Durable  

Water Resistant
No  
No  

Scratch Resistant
No  
No  

Stain Resistant
No  
No  

Wind Resistant
No  
No  

Acid Resistant
No  
No  

Appearance
Muddy  
Layered, Banded, Veined and Shiny  

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing  
Curbing  

Industry
  
  

Construction Industry
Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar  
Building houses or walls, Construction Aggregate  

Medical Industry
-  
-  

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

Other Uses
  
  

Commercial Uses
Creating Artwork, Pottery  
Creating Artwork  

Types

Types
Red Shale, Black Shale, Green Shale, Grey Shale and Yellow Shale  
Sedimentary rock  

Features
Easily splits into thin plates, Generally rough to touch, Very fine grained rock  
Available in Lots of Colors and Patterns, Is one of the oldest rock  

Archaeological Significance
  
  

Monuments
-  
-  

Famous Monuments
Jantar Mantar in India  
-  

Sculpture
-  
-  

Famous Sculptures
-  
-  

Pictographs
-  
-  

Petroglyphs
-  
-  

Figurines
-  
-  

Fossils
Present  
Present  

Formation

Formation
Shale forms when very fine-grained clay particles are deposited in water which settle at the bottom of water bodies. They are later compacted hence forming shale.  
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
Albite, Biotite, Calcite, Chert, Chlorite, Dolomite, Hematite, Micas, Muscovite or Illite, Pyrite, Quartz, Silica, Sulfides  
Apatite, Augite, Bronzite, Calcite, Chert, Chlorite, Clay Minerals, Epidote, Feldspar, Garnet, Micas, Muscovite or Illite  

Compound Content
Ca, Fe, Mg, Silicon Dioxide, Sodium  
CaO, Carbon Dioxide, Iron(III) Oxide, MgO  

Transformation
  
  

Metamorphism
No  
No  

Types of Metamorphism
-  
-  

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  
Coastal Erosion, Sea Erosion, Water Erosion, Wind Erosion  

Properties

Physical Properties
  
  

Hardness
3  
1-2  

Grain Size
Very fine-grained  
Coarse Grained  

Fracture
-  
Irregular  

Streak
White  
White  

Porosity
Highly Porous  
Highly Porous  

Luster
Dull  
Dull to Vitreous to Submetallic  

Compressive Strength
95.00 N/mm2  
30
-  

Cleavage
Slaty  
-  

Toughness
2.6  
-  

Specific Gravity
2.2-2.8  
1.10-2.24  

Transparency
Opaque  
Opaque  

Density
2.4-2.8 g/cm3  
2.8-2.9 g/cm3  

Thermal Properties
  
  

Specific Heat Capacity
0.39 kJ/Kg K  
30
0.84 kJ/Kg K  
15

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

Reserves

Deposits in Eastern Continents
  
  

Asia
Bangladesh, China, India, Russia  
-  

Africa
Ethiopia, Kenya, Morocco, South Africa, Tanzania  
-  

Europe
Austria, France, Germany, Greece, Italy, Romania, Scotland, Spain, Switzerland  
United Kingdom  

Others
-  
-  

Deposits in Western Continents
  
  

North America
USA  
USA  

South America
Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela  
-  

Deposits in Oceania Continent
  
  

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

Definition >>
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Shale vs Coquina 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 Shale and Coquina Reserves. Shale is a fine-grained sedimentary rock which is formed by the compaction of silt and clay-size mineral particles. 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. 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 Shale vs Coquina information and Shale vs Coquina characteristics in the upcoming sections.

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Shale vs Coquina 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. Shale vs Coquina characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Shale and Properties of Coquina. Learn more about Shale vs Coquina in the next section. The interior uses of Shale include Decorative aggregates, Homes and Interior decoration whereas the interior uses of Coquina include Decorative aggregates, Homes, Hotels and Interior decoration. Due to some exceptional properties of Shale and Coquina, they have various applications in construction industry. The uses of Shale in construction industry include Cement manufacture, Construction aggregate, For road aggregate, Making natural cement, Raw material for the manufacture of mortar and that of Coquina include Building houses or walls, Construction aggregate.

More about Shale and Coquina

Here you can know more about Shale and Coquina. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Shale and Coquina consists of mineral content and compound content. The mineral content of Shale includes Albite, Biotite, Calcite, Chert, Chlorite, Dolomite, Hematite, Micas, Muscovite or Illite, Pyrite, Quartz, Silica, Sulfides and mineral content of Coquina includes Apatite, Augite, Bronzite, Calcite, Chert, Chlorite, Clay Minerals, Epidote, Feldspar, Garnet, Micas, Muscovite or Illite. You can also check out the list of all Sedimentary Rocks. When we have to compare Shale vs Coquina, the texture, color and appearance plays an important role in determining the type of rock. Shale is available in black, brown, buff, green, grey, red, yellow colors whereas, Coquina is available in beige, buff, orange colors. Appearance of Shale is Muddy and that of Coquina is Layered, Banded, Veined and Shiny. Properties of rock is another aspect for Shale vs Coquina. The hardness of Shale is 3 and that of Coquina is 1-2. The types of Shale are Red Shale, Black Shale, Green Shale, Grey Shale and Yellow Shale whereas types of Coquina are Sedimentary rock. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Shale and Coquina is white. The specific heat capacity of Shale is 0.39 kJ/Kg K and that of Coquina is 0.84 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Shale is heat resistant, impact resistant whereas Coquina is heat resistant, impact resistant, pressure resistant, wear resistant.

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