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Comendite and Felsite


Felsite and Comendite


Definition

Definition
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite   
Felsite is a very fine grained volcanic rock that may or may not contain larger crystals and light colored rock that typically requires petrographic examination or chemical analysis for more precise definition   

History
  
  

Origin
Italy   
Unknown   

Discoverer
Unknown   
Unknown   

Etymology
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy   
From English feldspar and -ite   

Class
Igneous Rocks   
Igneous Rocks   

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

Family
  
  

Group
Volcanic   
Volcanic   

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

Texture

Texture
Porphyritic   
Arborescent Patterned, Vitreous   

Color
Blue, Bluish - Grey   
Black, Blue, Brown, Green, Orange, Red, Tan, Yellow   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
No   

Wind Resistant
Yes   
Yes   

Acid Resistant
Yes   
No   

Appearance
Foliated   
Layered, Banded, Veined and Shiny   

Uses

Architecture
  
  

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

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

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   
Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points   

Medical Industry
Not Yet Used   
Surgery   

Antiquity Uses
Artifacts   
Artifacts   

Other Uses
  
  

Commercial Uses
Cemetery Markers   
Mirror, Jewelry   

Types

Types
Rhyolite   
Not Available   

Features
Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock   
Available in Lots of Colors and Patterns, Clasts are smooth to touch, Splintery, Very fine grained 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
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.   
Felsite is a fine-grained, hard rock which is a type of metasomatite, essentially altered basalt. It forms with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.   

Composition
  
  

Mineral Content
Albite, Amphibole, Quartz   
Feldspar, Iron Oxides   

Compound Content
Al, Fe, Potassium Oxide   
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide   

Transformation
  
  

Metamorphism
Yes   
Yes   

Types of Metamorphism
Cataclastic Metamorphism, Regional Metamorphism   
Burial Metamorphism, Contact 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, Water Erosion   
Chemical Erosion, Glacier Erosion, Water Erosion   

Properties

Physical Properties
  
  

Hardness
6-7   
5-5.5   

Grain Size
Medium Grained   
Fine Grained   

Fracture
Pervasive   
Conchoidal   

Streak
Bluish Black   
White   

Porosity
Highly Porous   
Very Less Porous   

Luster
Dull   
Vitreous   

Compressive Strength
92.40 N/mm2   
21
0.15 N/mm2   
33

Cleavage
Not Available   
Non-Existent   

Toughness
2   
Not Available   

Specific Gravity
2.38   
2.6-2.7   

Transparency
Opaque   
Translucent   

Density
Not Available   
2.6 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
Not Available   
0.92 kJ/Kg K   
10

Resistance
Heat Resistant, Impact Resistant   
Heat Resistant, Impact Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
China   
Afghanistan, Indonesia, Japan, Russia   

Africa
East Africa   
Kenya   

Europe
Italy   
Greece, Hungary, Iceland, Italy, Turkey   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Not Yet Found   
Canada, Mexico, USA   

South America
Not Yet Found   
Argentina, Chile, Ecuador, Peru   

Deposits in Oceania Continent
  
  

Australia
Queensland   
New Zealand   

Summary >>
<< Reserves

All about Comendite and Felsite Properties

Know all about Comendite and Felsite properties here. All properties of rocks are important as they define the type of rock and its application. Comendite and Felsite belong to Igneous Rocks.Texture of Comendite is Porphyritic whereas that of Felsite is Arborescent Patterned, Vitreous. Comendite appears Foliated and Felsite appears Layered, Banded, Veined and Shiny. The luster of Comendite is dull while that of Felsite is vitreous. Comendite is available in blue, bluish - grey colors whereas Felsite is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Comendite are cemetery markers and that of Felsite are mirror, jewelry.

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