Comendite and Gossan
Definition
Definition
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite
Gossan is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein.
History
Origin
Italy
Indonesia
Discoverer
Unknown
Cornish Gossen
Etymology
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy
From Cornish gossen from gos, blood from Old Cornish guit
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Not Applicable
Other Categories
Medium Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock
Texture
Texture
Porphyritic
Rough, Sandy
Color
Blue, Bluish - Grey
Brown, Brown- Black, Gold, Green, Rust
Maintenance
Less
Less
Durability
Durable
Durable
Water Resistant
Yes
Yes
Scratch Resistant
Yes
Yes
Stain Resistant
Yes
Yes
Wind Resistant
Yes
No
Acid Resistant
Yes
No
Appearance
Foliated
Dull and Banded
Uses
Architecture
Interior Uses
Countertops, Decorative Aggregates, Interior Decoration
Countertops, Decorative Aggregates, Interior Decoration
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration
As Building Stone, As Facing Stone, Paving Stone, Garden Decoration, Office Buildings
Other Architectural Uses
Curbing
Curbing
Industry
Construction Industry
Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Raw material for the manufacture of mortar
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate
Medical Industry
Not Yet Used
Not Yet Used
Antiquity Uses
Artifacts
Artifacts
Other Uses
Commercial Uses
Cemetery Markers
Cemetery Markers, Commemorative Tablets, Gemstone
Types
Types
Rhyolite
Translocated gossan and Leakage gossan
Features
Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock
Clasts are smooth to touch, Easily splits into thin plates
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
Not Used
Used
Petroglyphs
Not Used
Used
Figurines
Not Yet Used
Not Yet Used
Fossils
Absent
Absent
Formation
Formation
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.
Earth movements can cause rocks to be either deeply buried or squeezed and hence the rocks are heated and put under great pressure.
Composition
Mineral Content
Albite, Amphibole, Quartz
Apatite, Augite, Biotite, Bronzite, Calcite, Chert, Epidote, Feldspar, Hornblende, Micas, Plagioclase, Pyroxene, Quartz, Sulfides, Zircon
Compound Content
Al, Fe, Potassium Oxide
Aluminium Oxide, CaO, Fe, FeO, Silicon Dioxide, Sulphur
Transformation
Metamorphism
Yes
No
Types of Metamorphism
Cataclastic Metamorphism, Regional Metamorphism
Not Applicable
Weathering
Yes
No
Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Not Applicable
Erosion
Yes
Yes
Types of Erosion
Coastal Erosion, Water Erosion
Chemical Erosion, Sea Erosion, Wind Erosion
Properties
Physical Properties
Hardness
6-7
4-5
Grain Size
Medium Grained
Fine to Medium Grained
Fracture
Pervasive
Conchoidal
Streak
Bluish Black
White to Grey
Porosity
Highly Porous
Highly Porous
Luster
Dull
Metallic
Compressive Strength
92.40 N/mm2
21
Not Available
Cleavage
Not Available
Not Available
Toughness
2
Not Available
Specific Gravity
2.38
2.0
Transparency
Opaque
Opaque
Density
Not Available
Not Available
Thermal Properties
Specific Heat Capacity
Not Available
0.24 kJ/Kg K
24
Resistance
Heat Resistant, Impact Resistant
Heat Resistant, Impact Resistant, Pressure Resistant
Reserves
Deposits in Eastern Continents
Asia
China
China, India, Indonesia, Russia, Singapore, South Korea
Africa
East Africa
Cape Verde, Ethiopia, Ghana, South Africa, Western Africa
Europe
Italy
Albania, France, Germany, Great Britain, United Kingdom
Others
Not Yet Found
Not Yet Found
Deposits in Western Continents
North America
Not Yet Found
Canada, USA
South America
Not Yet Found
Brazil, Colombia, Ecuador
Deposits in Oceania Continent
Australia
Queensland
New South Wales, South Australia, Western Australia
All about Comendite and Gossan Properties
Know all about Comendite and Gossan properties here. All properties of rocks are important as they define the type of rock and its application. Comendite belongs to Igneous Rocks while Gossan belongs to Metamorphic Rocks.Texture of Comendite is Porphyritic whereas that of Gossan is Rough, Sandy. Comendite appears Foliated and Gossan appears Dull and Banded. The luster of Comendite is dull while that of Gossan is metallic. Comendite is available in blue, bluish - grey colors whereas Gossan is available in brown, brown- black, gold, green, rust colors. The commercial uses of Comendite are cemetery markers and that of Gossan are cemetery markers, commemorative tablets, gemstone.
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