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Comendite
Comendite

Porphyry
Porphyry



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Comendite and Porphyry

1 Definition
1.1 Definition
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite
Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix
1.2 History
1.2.1 Origin
Italy
Egypt
1.2.2 Discoverer
Unknown
Unknown
1.3 Etymology
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy
From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites
1.4 Class
Igneous Rocks
Igneous Rocks
1.4.1 Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
1.5 Family
1.5.1 Group
Volcanic
Plutonic
1.6 Other Categories
Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock
2 Texture
2.1 Texture
Porphyritic
Porphyritic
2.2 Color
Blue, Bluish - Grey
Black, Brown, Colourless, Green, Grey, Red, Rust, White
2.3 Maintenance
Less
Less
2.4 Durability
Durable
Durable
2.4.1 Water Resistant
81% Igneous Rocks Rocks have it !
81% Igneous Rocks Rocks have it !
2.4.2 Scratch Resistant
86% Igneous Rocks Rocks have it !
86% Igneous Rocks Rocks have it !
2.4.3 Stain Resistant
66% Igneous Rocks Rocks have it !
66% Igneous Rocks Rocks have it !
2.4.4 Wind Resistant
49% Igneous Rocks Rocks have it !
49% Igneous Rocks Rocks have it !
2.4.5 Acid Resistant
48% Igneous Rocks Rocks have it !
48% Igneous Rocks Rocks have it !
2.5 Appearance
Foliated
Dull
3 Uses
3.1 Architecture
3.1.1 Interior Uses
Countertops, Decorative Aggregates, Interior Decoration
Decorative Aggregates, Interior Decoration
3.1.2 Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration
Garden Decoration, Paving Stone
3.1.3 Other Architectural Uses
Curbing
Curbing
3.2 Industry
3.2.1 Construction Industry
Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Raw material for the manufacture of mortar
Construction Aggregate
3.2.2 Medical Industry
Not Yet Used
Not Yet Used
3.3 Antiquity Uses
Artifacts
Artifacts, Monuments, Sculpture
3.4 Other Uses
3.4.1 Commercial Uses
Cemetery Markers
Creating Artwork, Gemstone, Jewelry
4 Types
4.1 Types
Rhyolite
Rhomb Porphyry
4.2 Features
Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock
Generally rough to touch, Is one of the oldest rock, Surfaces are often shiny
4.3 Archaeological Significance
4.3.1 Monuments
Not Yet Used
Used
4.3.2 Famous Monuments
Not Applicable
Data Not Available
4.3.3 Sculpture
Not Yet Used
Used
4.3.4 Famous Sculptures
Not Applicable
Data Not Available
4.3.5 Pictographs
Not Used
Not Used
4.3.6 Petroglyphs
Not Used
Not Used
4.3.7 Figurines
Not Yet Used
Used
4.4 Fossils
Absent
Absent
5 Formation
5.1 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.
Porphyry is formed in two stages: the magma cools slowly deep within the crust or the magma is cools rapidly as it erupts from a volcano, creating small grains that are usually invisible to naked eye.
5.2 Composition
5.2.1 Mineral Content
Albite, Amphibole, Quartz
Biotite, Chert, Feldspar, Garnet, Graphite, Quartz, Silica
5.2.2 Compound Content
Al, Fe, Potassium Oxide
Aluminium Oxide, CaO, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Titanium Dioxide
5.3 Transformation
5.3.1 Metamorphism
97% Igneous Rocks Rocks have it !
97% Igneous Rocks Rocks have it !
5.3.2 Types of Metamorphism
Cataclastic Metamorphism, Regional Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism
5.3.3 Weathering
99% Igneous Rocks Rocks have it !
99% Igneous Rocks Rocks have it !
5.3.4 Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Biological Weathering, Chemical Weathering, Not Registered
5.3.5 Erosion
92% Igneous Rocks Rocks have it !
92% Igneous Rocks Rocks have it !
5.3.6 Types of Erosion
Coastal Erosion, Water Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion
6 Properties
6.1 Physical Properties
6.1.1 Hardness
6-7
6-7
6.1.2 Grain Size
Medium Grained
Fine Grained
6.1.3 Fracture
Pervasive
Irregular
6.1.4 Streak
Bluish Black
White
6.1.5 Porosity
Highly Porous
Less Porous
6.1.6 Luster
Dull
Dull
6.1.7 Compressive Strength
What Is Flint
92.40 N/mm2
Rank: 21 (Overall)
Not Available
Rank: N/A (Overall)
What Is Obsidian
ADD ⊕
6.1.8 Cleavage
Not Available
Imperfect
6.1.9 Toughness
2
1.7
6.1.10 Specific Gravity
2.38
2.5-4
6.1.11 Transparency
Opaque
Translucent to Opaque
6.1.12 Density
Not Available
2.5-2.52 g/cm3
6.2 Thermal Properties
6.2.1 Specific Heat Capacity
What Is Banded ..
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
What Is Granulite
ADD ⊕
6.2.2 Resistance
Heat Resistant, Impact Resistant
Heat Resistant, Impact Resistant
7 Reserves
7.1 Deposits in Eastern Continents
7.1.1 Asia
China
China, Kazakhstan, South Korea, Thailand, Turkey, Vietnam
7.1.2 Africa
East Africa
Egypt, Ethiopia, Ghana, South Africa
7.1.3 Europe
Italy
Finland, France, Germany, Great Britain, Hungary, Iceland, Ireland, Italy, Netherlands, Norway, Romania, Sweden, Switzerland
7.1.4 Others
Not Yet Found
Greenland
7.2 Deposits in Western Continents
7.2.1 North America
Not Yet Found
Canada, Cuba, Jamaica, USA
7.2.2 South America
Not Yet Found
Bolivia, Brazil, Colombia, Ecuador, Paraguay
7.3 Deposits in Oceania Continent
7.3.1 Australia
Queensland
New South Wales, New Zealand, Western Australia

All about Comendite and Porphyry Properties

Know all about Comendite and Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Comendite and Porphyry belong to Igneous Rocks.Texture of Comendite is Porphyritic whereas that of Porphyry is Porphyritic. Comendite appears Foliated and Porphyry appears Dull. The luster of Comendite and Porphyry is dull. Comendite is available in blue, bluish - grey colors whereas Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors. The commercial uses of Comendite are cemetery markers and that of Porphyry are creating artwork, gemstone, jewelry.