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Gossan and Comendite


Comendite and Gossan


Definition

Definition
Gossan is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein.   
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite   

History
  
  

Origin
Indonesia   
Italy   

Discoverer
Cornish Gossen   
Unknown   

Etymology
From Cornish gossen from gos, blood from Old Cornish guit   
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy   

Class
Metamorphic Rocks   
Igneous Rocks   

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

Family
  
  

Group
Not Applicable   
Volcanic   

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

Texture

Texture
Rough, Sandy   
Porphyritic   

Color
Brown, Brown- Black, Gold, Green, Rust   
Blue, Bluish - Grey   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
Yes   

Wind Resistant
No   
Yes   

Acid Resistant
No   
Yes   

Appearance
Dull and Banded   
Foliated   

Uses

Architecture
  
  

Interior Uses
Countertops, Decorative Aggregates, Interior Decoration   
Countertops, Decorative Aggregates, Interior Decoration   

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

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

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts   
Artifacts   

Other Uses
  
  

Commercial Uses
Cemetery Markers, Commemorative Tablets, Gemstone   
Cemetery Markers   

Types

Types
Translocated gossan and Leakage gossan   
Rhyolite   

Features
Clasts are smooth to touch, Easily splits into thin plates   
Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Not Yet Used   

Famous Monuments
Not Applicable   
Not Applicable   

Sculpture
Not Yet Used   
Not Yet Used   

Famous Sculptures
Not Applicable   
Not Applicable   

Pictographs
Used   
Not Used   

Petroglyphs
Used   
Not Used   

Figurines
Not Yet Used   
Not Yet Used   

Fossils
Absent   
Absent   

Formation

Formation
Earth movements can cause rocks to be either deeply buried or squeezed and hence the rocks are heated and put under great pressure.   
Comendite is a type of Igneous rock which is formed due to cooling and solidification of lava or magma. It may form with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.   

Composition
  
  

Mineral Content
Apatite, Augite, Biotite, Bronzite, Calcite, Chert, Epidote, Feldspar, Hornblende, Micas, Plagioclase, Pyroxene, Quartz, Sulfides, Zircon   
Albite, Amphibole, Quartz   

Compound Content
Aluminium Oxide, CaO, Fe, FeO, Silicon Dioxide, Sulphur   
Al, Fe, Potassium Oxide   

Transformation
  
  

Metamorphism
No   
Yes   

Types of Metamorphism
Not Applicable   
Cataclastic Metamorphism, Regional Metamorphism   

Weathering
No   
Yes   

Types of Weathering
Not Applicable   
Biological Weathering, Chemical Weathering, Mechanical Weathering   

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
4-5   
6-7   

Grain Size
Fine to Medium Grained   
Medium Grained   

Fracture
Conchoidal   
Pervasive   

Streak
White to Grey   
Bluish Black   

Porosity
Highly Porous   
Highly Porous   

Luster
Metallic   
Dull   

Compressive Strength
Not Available   
92.40 N/mm2   
21

Cleavage
Not Available   
Not Available   

Toughness
Not Available   
2   

Specific Gravity
2.0   
2.38   

Transparency
Opaque   
Opaque   

Density
Not Available   
Not Available   

Thermal Properties
  
  

Specific Heat Capacity
0.24 kJ/Kg K   
24
Not Available   

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

Reserves

Deposits in Eastern Continents
  
  

Asia
China, India, Indonesia, Russia, Singapore, South Korea   
China   

Africa
Cape Verde, Ethiopia, Ghana, South Africa, Western Africa   
East Africa   

Europe
Albania, France, Germany, Great Britain, United Kingdom   
Italy   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
Not Yet Found   

South America
Brazil, Colombia, Ecuador   
Not Yet Found   

Deposits in Oceania Continent
  
  

Australia
New South Wales, South Australia, Western Australia   
Queensland   

Summary >>
<< Reserves

All about Gossan and Comendite Properties

Know all about Gossan and Comendite properties here. All properties of rocks are important as they define the type of rock and its application. Gossan belongs to Metamorphic Rocks while Comendite belongs to Igneous Rocks.Texture of Gossan is Rough, Sandy whereas that of Comendite is Porphyritic. Gossan appears Dull and Banded and Comendite appears Foliated. The luster of Gossan is metallic while that of Comendite is dull. Gossan is available in brown, brown- black, gold, green, rust colors whereas Comendite is available in blue, bluish - grey colors. The commercial uses of Gossan and Comendite are cemetery markers, commemorative tablets, gemstone.

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