Coquina and Andesite
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
Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava
History
Origin
European Foreland Basins
North America
Discoverer
Unknown
Unknown
Etymology
From Concha (Latin)+ Coquina(Spanish) +conch(English)= Couquina (mid 19th century)
From Andes mountains, where it is found in abundance
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, Opaque Rock
Texture
Texture
Clastic
Aphanitic to Porphyritic
Color
Beige, Buff, Orange
Bluish - Grey, Grey, Pink, Yellow
Maintenance
More
More
Durability
Non-Durable
Durable
Water Resistant
No
No
Scratch Resistant
No
Yes
Stain Resistant
No
Yes
Wind Resistant
No
No
Acid Resistant
No
Yes
Appearance
Layered, Banded, Veined and Shiny
Dull and Soft
Uses
Architecture
Interior Uses
Decorative Aggregates, Homes, Hotels, Interior Decoration
Decorative Aggregates, Floor Tiles, Homes, Interior Decoration, Kitchens
Exterior Uses
Garden Decoration, Office Buildings
Office Buildings, Roof Tiles
Other Architectural Uses
Curbing
Curbing
Industry
Construction Industry
Building houses or walls, Construction Aggregate
Cobblestones, 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
Commemorative Tablets, Creating Artwork
Types
Types
Not Available
Icelandite
Features
Available in Lots of Colors and Patterns, Is one of the oldest rock
Generally rough to touch, High silica content, Is one of the oldest rock
Archaeological Significance
Monuments
Used
Used
Famous Monuments
Data Not Available
Middle of the Earth in Ecuador
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.
Andesite is a fine-grained igneous rock that forms when the magma is erupted onto the surface and is crystallized quickly.
Composition
Mineral Content
Apatite, Augite, Bronzite, Calcite, Chert, Chlorite, Clay Minerals, Epidote, Feldspar, Garnet, Micas, Muscovite or Illite
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Ilmenite, Magnetite, Plagioclase, Pyroxene, Zircon
Compound Content
CaO, Carbon Dioxide, Iron(III) Oxide, MgO
Silicon Dioxide
Transformation
Metamorphism
No
Yes
Types of Metamorphism
Not Applicable
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional 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
Coastal Erosion, Sea Erosion, Water Erosion, Wind Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion
Properties
Physical Properties
Hardness
1-2
7
Grain Size
Coarse Grained
Very fine-grained
Fracture
Irregular
Uneven
Streak
White
White
Porosity
Highly Porous
Less Porous
Luster
Dull to Vitreous to Submetallic
Vitreous
Compressive Strength
Not Available
225.00 N/mm2
7
Cleavage
Not Available
Not Available
Toughness
Not Available
1.1
Specific Gravity
1.10-2.24
2.5-2.8
Transparency
Opaque
Opaque
Density
2.8-2.9 g/cm3
2.11-2.36 g/cm3
Thermal Properties
Specific Heat Capacity
Not Available
2.39 kJ/Kg K
2
Resistance
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
Heat Resistant, Pressure Resistant, Wear Resistant
Reserves
Deposits in Eastern Continents
Asia
Not Yet Found
India, Indonesia, Japan, Nepal, South Korea
Africa
Not Yet Found
Egypt, Ethiopia, Morocco, Namibia, South Africa, Tanzania
Europe
United Kingdom
Austria, Finland, Germany, Italy, Romania, Turkey, United Kingdom
Others
Not Yet Found
Not Yet Found
Deposits in Western Continents
North America
USA
Mexico, USA
South America
Not Yet Found
Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela
Deposits in Oceania Continent
Australia
Not Yet Found
New South Wales, New Zealand, Western Australia
All about Coquina and Andesite Properties
Know all about Coquina and Andesite properties here. All properties of rocks are important as they define the type of rock and its application. Coquina belongs to Sedimentary Rocks while Andesite belongs to Igneous Rocks.Texture of Coquina is Clastic whereas that of Andesite is Aphanitic to Porphyritic. Coquina appears Layered, Banded, Veined and Shiny and Andesite appears Dull and Soft. The luster of Coquina is dull to vitreous to submetallic while that of Andesite is vitreous. Coquina is available in beige, buff, orange colors whereas Andesite is available in bluish - grey, grey, pink, yellow colors. The commercial uses of Coquina are creating artwork and that of Andesite are commemorative tablets, creating artwork.
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