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Rhyodacite
Rhyodacite

Skarn
Skarn



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Rhyodacite and Skarn

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1 Definition
1.1 Definition
Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite
Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin
1.2 History
1.2.1 Origin
USA
USA, Australia
1.2.2 Discoverer
Unknown
Tornebohm
1.3 Etymology
Rhyo lite + dacite : a rock intermediate between rhyolite and dacite that is the extrusive equivalent of granodiorite
From an old Swedish mining term originally used to describe a type of silicate gangue or waste rock.
1.4 Class
Igneous Rocks
Metamorphic Rocks
1.4.1 Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
1.5 Family
1.5.1 Group
Volcanic
Not Applicable
1.6 Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock
2 Texture
2.1 Texture
Earthy
Earthy, Mud-rich, Rough
2.2 Color
Black to Grey, Dark Greenish - Grey
Black, Brown, Colourless, Green, Grey, White
2.3 Maintenance
More
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
Skeletal
Dull
3 Uses
3.1 Architecture
3.1.1 Interior Uses
Decorative Aggregates, Interior Decoration
Decorative Aggregates, Entryways, Interior Decoration
3.1.2 Exterior Uses
As Building Stone, Garden Decoration
As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
3.1.3 Other Architectural Uses
Curbing
Curbing
3.2 Industry
3.2.1 Construction Industry
As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping
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
3.2.2 Medical Industry
Not Yet Used
Not Applicable
3.3 Antiquity Uses
Artifacts
Artifacts, Monuments, Sculpture
3.4 Other Uses
3.4.1 Commercial Uses
Cemetery Markers, Creating Artwork
Creating Artwork, Gemstone, Jewelry, Metallurgical Flux, Source of Magnesia (MgO)
4 Types
4.1 Types
Not Available
Endoskarns
4.2 Features
Available in Lots of Colors and Patterns
Host Rock for Lead, Zinc and Copper Deposits
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
Used
Not Used
4.3.6 Petroglyphs
Used
Not Used
4.3.7 Figurines
Not Yet Used
Used
4.4 Fossils
Absent
Absent
5 Formation
5.1 Formation
Rhyodacite 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.
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.
5.2 Composition
5.2.1 Mineral Content
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon
Calcite, Enstatite, Epidote, Garnet, Magnetite, Pyroxene, Titanite
5.2.2 Compound Content
Ca, Fe, Potassium Oxide, NA, Potassium, Silicon Dioxide
Au, CaO, Carbon Dioxide, Cu, Fe, MgO
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, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism
5.3.3 Weathering
5.3.4 Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Not Applicable
5.3.5 Erosion
5.3.6 Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion
Not Applicable
6 Properties
6.1 Physical Properties
6.1.1 Hardness
5.5-66.5
Coal
1 7
6.1.2 Grain Size
Fine Grained
Fine Grained
6.1.3 Fracture
Conchoidal
Irregular
6.1.4 Streak
Black
Light to dark brown
6.1.5 Porosity
Less Porous
Less Porous
6.1.6 Luster
Greasy to Dull
Waxy and Dull
6.1.7 Compressive Strength
200.50 N/mm2NA
What Is Obsidian
0.15 450
6.1.8 Cleavage
Not Available
Slaty
6.1.9 Toughness
2.1
2.4
6.1.10 Specific Gravity
2.34-2.402.86
Granite
0 8.4
6.1.11 Transparency
Opaque
Opaque
6.1.12 Density
Not Available2.8-2.9 g/cm3
Granite
0 1400
6.2 Thermal Properties
6.2.1 Specific Heat Capacity
1.12 kJ/Kg K0.92 kJ/Kg K
What Is Granulite
0.14 3.2
6.2.2 Resistance
Heat Resistant
Heat Resistant
7 Reserves
7.1 Deposits in Eastern Continents
7.1.1 Asia
China, India, Iran, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Vietnam
China, India, Russia, Saudi Arabia, South Korea, Sri Lanka
7.1.2 Africa
Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa
South Africa, Western Africa
7.1.3 Europe
Austria, Belgium, Finland, France, Germany, Italy, Norway, Sardinia, Spain, Switzerland
United Kingdom
7.1.4 Others
Not Yet Found
Not Yet Found
7.2 Deposits in Western Continents
7.2.1 North America
Canada, USA
Canada
7.2.2 South America
Not Yet Found
Brazil, Colombia, Paraguay
7.3 Deposits in Oceania Continent
7.3.1 Australia
Not Yet Found
Central Australia, Western Australia

All about Rhyodacite and Skarn Properties

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