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Comendite
Comendite

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Dacite



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Comendite
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Dacite

Comendite and Dacite

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1 Definition
1.1 Definition
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite
Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite
1.2 History
1.2.1 Origin
Italy
Romania and Moldova, Europe
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 Dacia, a province of the Roman Empire which lay between the Danube River and Carpathian Mountains where the rock was first described
1.4 Class
Igneous Rocks
Igneous Rocks
1.4.1 Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
1.5 Family
1.5.1 Group
Volcanic
Volcanic
1.6 Other Categories
Medium Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock
2 Texture
2.1 Texture
Porphyritic
Aphanitic to Porphyritic
2.2 Color
Blue, Bluish - Grey
Bluish - Grey, Brown, Grey, Light to Dark Grey
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
Vesicular
3 Uses
3.1 Architecture
3.1.1 Interior Uses
Countertops, Decorative Aggregates, Interior Decoration
Decorative Aggregates, Entryways, Interior Decoration
3.1.2 Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration
As Building Stone, Paving Stone, Garden Decoration
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
As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping
3.2.2 Medical Industry
Not Yet Used
Not Yet Used
3.3 Antiquity Uses
Artifacts
Artifacts
3.4 Other Uses
3.4.1 Commercial Uses
Cemetery Markers
Commemorative Tablets, Creating Artwork
4 Types
4.1 Types
Rhyolite
Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite
4.2 Features
Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock
Host Rock for Lead, Is one of the oldest rock
4.3 Archaeological Significance
4.3.1 Monuments
Not Yet Used
Not Yet Used
4.3.2 Famous Monuments
Not Applicable
Not Applicable
4.3.3 Sculpture
Not Yet Used
Not Yet Used
4.3.4 Famous Sculptures
Not Applicable
Not Applicable
4.3.5 Pictographs
Not Used
Used
4.3.6 Petroglyphs
Not Used
Used
4.3.7 Figurines
Not Yet Used
Not Yet 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.
Dacitic magma is formed by the subduction of young oceanic crust under a thick felsic continental plate. Further, the Oceanic crust is hydrothermally altered as quartz and sodium are added.
5.2 Composition
5.2.1 Mineral Content
Albite, Amphibole, Quartz
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon
5.2.2 Compound Content
Al, Fe, Potassium Oxide
Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon 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
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, Mechanical Weathering
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
6 Properties
6.1 Physical Properties
6.1.1 Hardness
6-7
2-2.25
6.1.2 Grain Size
Medium Grained
Medium to Fine Coarse Grained
6.1.3 Fracture
Pervasive
Conchoidal
6.1.4 Streak
Bluish Black
White
6.1.5 Porosity
Highly Porous
Less Porous
6.1.6 Luster
Dull
Subvitreous to 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
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6.1.8 Cleavage
Not Available
Perfect
6.1.9 Toughness
2
Not Available
6.1.10 Specific Gravity
2.38
2.86-2.87
6.1.11 Transparency
Opaque
Translucent
6.1.12 Density
Not Available
2.77-2.771 g/cm3
6.2 Thermal Properties
6.2.1 Specific Heat Capacity
What Is Banded ..
Not Available
Rank: N/A (Overall)
0.92 kJ/Kg K
Rank: 10 (Overall)
What Is Granulite
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6.2.2 Resistance
Heat Resistant, Impact Resistant
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
7 Reserves
7.1 Deposits in Eastern Continents
7.1.1 Asia
China
Not Yet Found
7.1.2 Africa
East Africa
Not Yet Found
7.1.3 Europe
Italy
France, Greece, Romania, Scotland, Spain
7.1.4 Others
Not Yet Found
Not Yet Found
7.2 Deposits in Western Continents
7.2.1 North America
Not Yet Found
USA
7.2.2 South America
Not Yet Found
Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela
7.3 Deposits in Oceania Continent
7.3.1 Australia
Queensland
New Zealand, South Australia, Western Australia

All about Comendite and Dacite Properties

Know all about Comendite and Dacite properties here. All properties of rocks are important as they define the type of rock and its application. Comendite and Dacite belong to Igneous Rocks.Texture of Comendite is Porphyritic whereas that of Dacite is Aphanitic to Porphyritic. Comendite appears Foliated and Dacite appears Vesicular. The luster of Comendite is dull while that of Dacite is subvitreous to dull. Comendite is available in blue, bluish - grey colors whereas Dacite is available in bluish - grey, brown, grey, light to dark grey colors. The commercial uses of Comendite are cemetery markers and that of Dacite are commemorative tablets, creating artwork.