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Skarn
Skarn

Dacite
Dacite



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Skarn and Dacite

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1 Definition
1.1 Definition
Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin
Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite
1.2 History
1.2.1 Origin
USA, Australia
Romania and Moldova, Europe
1.2.2 Discoverer
Tornebohm
Unknown
1.3 Etymology
From an old Swedish mining term originally used to describe a type of silicate gangue or waste rock.
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
Metamorphic Rocks
Igneous Rocks
1.4.1 Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
1.5 Family
1.5.1 Group
Not Applicable
Volcanic
1.6 Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock
2 Texture
2.1 Texture
Earthy, Mud-rich, Rough
Aphanitic to Porphyritic
2.2 Color
Black, Brown, Colourless, Green, Grey, White
Bluish - Grey, Brown, Grey, Light to Dark Grey
2.3 Maintenance
Less
Less
2.4 Durability
Durable
Durable
2.4.1 Water Resistant
2.4.2 Scratch Resistant
2.4.3 Stain Resistant
2.4.4 Wind Resistant
2.4.5 Acid Resistant
2.5 Appearance
Dull
Vesicular
3 Uses
3.1 Architecture
3.1.1 Interior Uses
Decorative Aggregates, Entryways, Interior Decoration
Decorative Aggregates, Entryways, Interior Decoration
3.1.2 Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
As Building Stone, Paving Stone, Garden Decoration
3.1.3 Other Architectural Uses
Curbing
Curbing
3.2 Industry
3.2.1 Construction Industry
As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Gold and Silver production, Manufacture of Magnesium and Dolomite Refractories
As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping
3.2.2 Medical Industry
Not Applicable
Not Yet Used
3.3 Antiquity Uses
Artifacts, Monuments, Sculpture
Artifacts
3.4 Other Uses
3.4.1 Commercial Uses
Creating Artwork, Gemstone, Jewelry, Metallurgical Flux, Source of Magnesia (MgO)
Commemorative Tablets, Creating Artwork
4 Types
4.1 Types
Endoskarns
Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite
4.2 Features
Host Rock for Lead, Zinc and Copper Deposits
Host Rock for Lead, Is one of the oldest rock
4.3 Archaeological Significance
4.3.1 Monuments
Used
Not Yet Used
4.3.2 Famous Monuments
Data Not Available
Not Applicable
4.3.3 Sculpture
Used
Not Yet Used
4.3.4 Famous Sculptures
Data Not Available
Not Applicable
4.3.5 Pictographs
Not Used
Used
4.3.6 Petroglyphs
Not Used
Used
4.3.7 Figurines
Used
Not Yet Used
4.4 Fossils
Absent
Absent
5 Formation
5.1 Formation
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Skarn is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.
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
Calcite, Enstatite, Epidote, Garnet, Magnetite, Pyroxene, Titanite
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon
5.2.2 Compound Content
Au, CaO, Carbon Dioxide, Cu, Fe, MgO
Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon Dioxide
5.3 Transformation
5.3.1 Metamorphism
5.3.2 Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism
Burial Metamorphism, Cataclastic Metamorphism
5.3.3 Weathering
5.3.4 Types of Weathering
Not Applicable
Biological Weathering, Chemical Weathering, Mechanical Weathering
5.3.5 Erosion
5.3.6 Types of Erosion
Not Applicable
Chemical Erosion
6 Properties
6.1 Physical Properties
6.1.1 Hardness
6.52-2.25
Coal
1 7
6.1.2 Grain Size
Fine Grained
Medium to Fine Coarse Grained
6.1.3 Fracture
Irregular
Conchoidal
6.1.4 Streak
Light to dark brown
White
6.1.5 Porosity
Less Porous
Less Porous
6.1.6 Luster
Waxy and Dull
Subvitreous to Dull
6.1.7 Compressive Strength
NANA
What Is Obsidian
0.15 450
6.1.8 Cleavage
Slaty
Perfect
6.1.9 Toughness
2.4
Not Available
6.1.10 Specific Gravity
2.862.86-2.87
Granite
0 8.4
6.1.11 Transparency
Opaque
Translucent
6.1.12 Density
2.8-2.9 g/cm32.77-2.771 g/cm3
Granite
0 1400
6.2 Thermal Properties
6.2.1 Specific Heat Capacity
0.92 kJ/Kg K0.92 kJ/Kg K
What Is Granulite
0.14 3.2
6.2.2 Resistance
Heat Resistant
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
7 Reserves
7.1 Deposits in Eastern Continents
7.1.1 Asia
China, India, Russia, Saudi Arabia, South Korea, Sri Lanka
Not Yet Found
7.1.2 Africa
South Africa, Western Africa
Not Yet Found
7.1.3 Europe
United Kingdom
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
Canada
USA
7.2.2 South America
Brazil, Colombia, Paraguay
Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela
7.3 Deposits in Oceania Continent
7.3.1 Australia
Central Australia, Western Australia
New Zealand, South Australia, Western Australia

All about Skarn and Dacite Properties

Know all about Skarn and Dacite properties here. All properties of rocks are important as they define the type of rock and its application. Skarn belongs to Metamorphic Rocks while Dacite belongs to Igneous Rocks.Texture of Skarn is Earthy, Mud-rich, Rough whereas that of Dacite is Aphanitic to Porphyritic. Skarn appears Dull and Dacite appears Vesicular. The luster of Skarn is waxy and dull while that of Dacite is subvitreous to dull. Skarn is available in black, brown, colourless, green, grey, white colors whereas Dacite is available in bluish - grey, brown, grey, light to dark grey colors. The commercial uses of Skarn are creating artwork, gemstone, jewelry, metallurgical flux, source of magnesia (mgo) and that of Dacite are commemorative tablets, creating artwork.