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
  
A hydration and metamorphic transformation of ultramafic rock from the Earth's mantle is called as serpentinization, a group of minerals is formed by serpentinization compose rock 'serpentinite'.
  
History
  
  
Origin
European Foreland Basins
  
USA
  
Discoverer
Unknown
  
Unknown
  
Etymology
From Concha (Latin)+ Coquina(Spanish) +conch(English)= Couquina (mid 19th century)
  
From English word serpentinization.
  
Class
Sedimentary Rocks
  
Metamorphic Rocks
  
Sub-Class
Durable Rock, Soft Rock
  
Durable Rock, Medium Hardness Rock
  
Family
  
  
Group
Not Applicable
  
Not Applicable
  
Other Categories
Coarse Grained Rock, Opaque Rock
  
Fine Grained Rock, Opaque Rock
  
Texture
Clastic
  
Earthy
  
Color
Beige, Buff, Orange
  
Black, Brown, Colourless, Green, Grey, White
  
Maintenance
More
  
Less
  
Durability
Non-Durable
  
Durable
  
Water Resistant
No
  
Yes
  
Scratch Resistant
No
  
No
  
Stain Resistant
No
  
Yes
  
Wind Resistant
No
  
No
  
Acid Resistant
No
  
No
  
Appearance
Layered, Banded, Veined and Shiny
  
Rough and Dull
  
Architecture
  
  
Interior Uses
Decorative Aggregates, Homes, Hotels, Interior Decoration
  
Decorative Aggregates, Interior Decoration
  
Exterior Uses
Garden Decoration, Office Buildings
  
As Building Stone, Paving Stone, Garden Decoration, Office Buildings
  
Other Architectural Uses
Curbing
  
Curbing
  
Industry
  
  
Construction Industry
Building houses or walls, Construction Aggregate
  
As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement
  
Medical Industry
Not Yet Used
  
Not Yet Used
  
Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines
  
Artifacts, Jewellery, Monuments, Sculpture
  
Other Uses
  
  
Commercial Uses
Creating Artwork
  
Commemorative Tablets, Creating Artwork
  
Types
Not Available
  
Jadeitite
  
Features
Available in Lots of Colors and Patterns, Is one of the oldest rock
  
Host Rock for Lead
  
Archaeological Significance
  
  
Monuments
Used
  
Used
  
Famous Monuments
Data Not Available
  
Data Not Available
  
Sculpture
Used
  
Used
  
Famous Sculptures
Data Not Available
  
Data Not Available
  
Pictographs
Used
  
Used
  
Petroglyphs
Used
  
Used
  
Figurines
Used
  
Used
  
Fossils
Present
  
Absent
  
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.
  
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Serpentinite is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.
  
Composition
  
  
Mineral Content
Apatite, Augite, Bronzite, Calcite, Chert, Chlorite, Clay Minerals, Epidote, Feldspar, Garnet, Micas, Muscovite or Illite
  
Carbonate, Magnetite, Pyrrhotite, Serpentine, Sulfides
  
Compound Content
CaO, Carbon Dioxide, Iron(III) Oxide, MgO
  
Ca, CaO, Carbon Dioxide, KCl, MgO, Sulfur Dioxide, Sulphur
  
Transformation
  
  
Metamorphism
No
  
Yes
  
Types of Metamorphism
Not Applicable
  
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism
  
Weathering
Yes
  
No
  
Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
  
Not Applicable
  
Erosion
Yes
  
Yes
  
Types of Erosion
Coastal Erosion, Sea Erosion, Water Erosion, Wind Erosion
  
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Wind Erosion
  
Physical Properties
  
  
Hardness
1-2
  
3-5
  
Grain Size
Coarse Grained
  
Very fine-grained
  
Fracture
Irregular
  
Uneven
  
Streak
White
  
White, Greenish White or Grey
  
Porosity
Highly Porous
  
Less Porous
  
Luster
Dull to Vitreous to Submetallic
  
Waxy and Dull
  
Compressive Strength
Not Available
  
310.00 N/mm
2
  
2
Cleavage
Not Available
  
Irregular
  
Toughness
Not Available
  
7
  
Specific Gravity
1.10-2.24
  
2.79-3
  
Transparency
Opaque
  
Opaque
  
Density
2.8-2.9 g/cm3
  
2.5-3 g/cm3
  
Thermal Properties
  
  
Specific Heat Capacity
Not Available
  
0.95 kJ/Kg K
  
9
Resistance
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
  
Heat Resistant
  
Deposits in Eastern Continents
  
  
Asia
Not Yet Found
  
India, Saudi Arabia, Singapore, South Korea
  
Africa
Not Yet Found
  
Ethiopia, Western Africa
  
Europe
United Kingdom
  
England, Georgia, Switzerland, United Kingdom
  
Others
Not Yet Found
  
Not Yet Found
  
Deposits in Western Continents
  
  
North America
USA
  
Canada
  
South America
Not Yet Found
  
Colombia
  
Deposits in Oceania Continent
  
  
Australia
Not Yet Found
  
Central Australia, New South Wales, New Zealand, Western Australia
  
Coquina vs Serpentinite 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. Coquina vs Serpentinite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Coquina and Properties of Serpentinite. Learn more about Coquina vs Serpentinite in the next section. The interior uses of Coquina include Decorative aggregates, Homes, Hotels and Interior decoration whereas the interior uses of Serpentinite include Decorative aggregates and Interior decoration. Due to some exceptional properties of Coquina and Serpentinite, they have various applications in construction industry. The uses of Coquina in construction industry include Building houses or walls, Construction aggregate and that of Serpentinite include As dimension stone, Cement manufacture, For road aggregate, Making natural cement.
More about Coquina and Serpentinite
Here you can know more about Coquina and Serpentinite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Coquina and Serpentinite consists of mineral content and compound content. The mineral content of Coquina includes Apatite, Augite, Bronzite, Calcite, Chert, Chlorite, Clay Minerals, Epidote, Feldspar, Garnet, Micas, Muscovite or Illite and mineral content of Serpentinite includes Carbonate, Magnetite, Pyrrhotite, Serpentine, Sulfides. You can also check out the list of all Sedimentary Rocks. When we have to compare Coquina vs Serpentinite, the texture, color and appearance plays an important role in determining the type of rock. Coquina is available in beige, buff, orange colors whereas, Serpentinite is available in black, brown, colourless, green, grey, white colors. Appearance of Coquina is Layered, Banded, Veined and Shiny and that of Serpentinite is Rough and Dull. Properties of rock is another aspect for Coquina vs Serpentinite. The hardness of Coquina is 1-2 and that of Serpentinite is 3-5. The types of Coquina are Not Available whereas types of Serpentinite are Jadeitite. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Coquina is white while that of Serpentinite is white, greenish white or grey. The specific heat capacity of Coquina is Not Available and that of Serpentinite is 0.95 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Coquina is heat resistant, impact resistant, pressure resistant, wear resistant whereas Serpentinite is heat resistant.