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Comendite and Essexite 


Essexite  and Comendite


Definition

Definition
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite   
Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock   

History
  
  

Origin
Italy   
USA   

Discoverer
Unknown   
Unknown   

Etymology
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy   
From the locality in Essex County, Massachusetts,US   

Class
Igneous Rocks   
Igneous Rocks   

Sub-Class
Durable Rock, Hard Rock   
Durable Rock, Hard Rock   

Family
  
  

Group
Volcanic   
Plutonic   

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

Texture

Texture
Porphyritic   
Granular   

Color
Blue, Bluish - Grey   
Dark Grey to Black   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
Yes   

Wind Resistant
Yes   
Yes   

Acid Resistant
Yes   
No   

Appearance
Foliated   
Banded   

Uses

Architecture
  
  

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

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

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, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts   
Artifacts, Monuments, Sculpture, Small Figurines   

Other Uses
  
  

Commercial Uses
Cemetery Markers   
Cemetery Markers, Commemorative Tablets, Jewelry, Sea Defence, Tombstones   

Types

Types
Rhyolite   
Not Available   

Features
Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock   
Is one of the oldest rock, Smooth to touch   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Used   

Famous Monuments
Not Applicable   
Data Not Available   

Sculpture
Not Yet Used   
Used   

Famous Sculptures
Not Applicable   
Data Not Available   

Pictographs
Not Used   
Not Used   

Petroglyphs
Not Used   
Not Used   

Figurines
Not Yet Used   
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.   
Essexite is a type of igneous rock, which is usually dark grey to black plutonic rock. For the formation of essexite, suitable magma with exact composition of K, Ba, Rb, Cs, Sr should be produced.   

Composition
  
  

Mineral Content
Albite, Amphibole, Quartz   
Augite, Feldspar, Hornblende, Nepheline, Olivine, Plagioclase, Pyroxene   

Compound Content
Al, Fe, Potassium Oxide   
Aluminium Oxide, Ba, Ca, Cs, Potassium, Rb, Sodium, Sr   

Transformation
  
  

Metamorphism
Yes   
Yes   

Types of Metamorphism
Cataclastic Metamorphism, Regional Metamorphism   
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism   

Weathering
Yes   
Yes   

Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering   
Biological Weathering, Chemical Weathering   

Erosion
Yes   
Yes   

Types of Erosion
Coastal Erosion, Water Erosion   
Coastal Erosion, Glacier Erosion, Water Erosion   

Properties

Physical Properties
  
  

Hardness
6-7   
7   

Grain Size
Medium Grained   
Fine Grained   

Fracture
Pervasive   
Conchoidal   

Streak
Bluish Black   
Black   

Porosity
Highly Porous   
Highly Porous   

Luster
Dull   
Not Available   

Compressive Strength
92.40 N/mm2   
21
Not Available   

Cleavage
Not Available   
Not Available   

Toughness
2   
1.6   

Specific Gravity
2.38   
Not Available   

Transparency
Opaque   
Opaque   

Density
Not Available   
Not Available   

Thermal Properties
  
  

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

Reserves

Deposits in Eastern Continents
  
  

Asia
China   
India, Russia   

Africa
East Africa   
South Africa   

Europe
Italy   
Germany, Greece, Italy, Scotland, Turkey   

Others
Not Yet Found   
Greenland   

Deposits in Western Continents
  
  

North America
Not Yet Found   
Canada, USA   

South America
Not Yet Found   
Brazil, Colombia, Venezuela   

Deposits in Oceania Continent
  
  

Australia
Queensland   
New Zealand, Queensland   

Summary >>
<< Reserves

All about Comendite and Essexite  Properties

Know all about Comendite and Essexite  properties here. All properties of rocks are important as they define the type of rock and its application. Comendite and Essexite  belong to Igneous Rocks.Texture of Comendite is Porphyritic whereas that of Essexite  is Granular. Comendite appears Foliated and Essexite  appears Banded. The luster of Comendite is dull while that of Essexite  is not available. Comendite is available in blue, bluish - grey colors whereas Essexite  is available in dark grey to black colors. The commercial uses of Comendite are cemetery markers and that of Essexite  are cemetery markers, commemorative tablets, jewelry, sea defence, tombstones.

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