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Rhyodacite and Ijolite


Ijolite and Rhyodacite


Definition

Definition
Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite   
Ijolite is an intrusive igneous rock which is composed mainly of nepheline and an alkali pyroxene, usually aegirine-augite   

History
  
  

Origin
USA   
Finland, Europe   

Discoverer
Unknown   
Unknown   

Etymology
Rhyo lite + dacite : a rock intermediate between rhyolite and dacite that is the extrusive equivalent of granodiorite   
From the first syllable of the Finnish words Ii-vaara, Iijoki, &c. commonly used geographical names in Finland, and the Gr. Xiflos, a stone   

Class
Igneous Rocks   
Igneous Rocks   

Sub-Class
Durable Rock, Medium Hardness Rock   
Durable Rock, Medium Hardness Rock   

Family
  
  

Group
Volcanic   
Plutonic   

Other Categories
Fine Grained Rock, Opaque Rock   
Coarse Grained Rock, Opaque Rock   

Texture

Texture
Earthy   
Earthy, Granular   

Color
Black to Grey, Dark Greenish - Grey   
Brown, Buff, Cream, Green, Grey, Pink, White   

Maintenance
More   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
No   
No   

Wind Resistant
No   
No   

Acid Resistant
No   
No   

Appearance
Skeletal   
Banded and Foilated   

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Interior Decoration   
Decorative Aggregates, Entryways, Floor Tiles, Flooring, Homes, Interior Decoration, Kitchens   

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping   
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Manufacture of Magnesium and Dolomite Refractories   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts   
Artifacts, Monuments, Sculpture, Small Figurines   

Other Uses
  
  

Commercial Uses
Cemetery Markers, Creating Artwork   
Cemetery Markers, Creating Artwork   

Types

Types
Not Available   
Not Available   

Features
Available in Lots of Colors and Patterns   
Application of acids on the surface causes cloudy frosting, Available in Lots of Colors and Patterns, Is one of the oldest rock   

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
Used   
Used   

Petroglyphs
Used   
Used   

Figurines
Not Yet Used   
Used   

Fossils
Absent   
Absent   

Formation

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.   
Ijolite 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.   

Composition
  
  

Mineral Content
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon   
Albite, Amphibole, Biotite, Cancrinite, Feldspar, Hornblende, Plagioclase, Pyroxene, Sodalite   

Compound Content
Ca, Fe, Potassium Oxide, NA, Potassium, Silicon Dioxide   
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide   

Transformation
  
  

Metamorphism
Yes   
Yes   

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

Weathering
Yes   
Yes   

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

Erosion
Yes   
Yes   

Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion   
Chemical Erosion, Water Erosion, Wind Erosion   

Properties

Physical Properties
  
  

Hardness
5.5-6   
5.5-6   

Grain Size
Fine Grained   
Coarse Grained   

Fracture
Conchoidal   
Conchoidal to Uneven   

Streak
Black   
White   

Porosity
Less Porous   
Less Porous   

Luster
Greasy to Dull   
Greasy to Dull   

Compressive Strength
200.50 N/mm2   
9
Not Available   

Cleavage
Not Available   
Poor   

Toughness
2.1   
Not Available   

Specific Gravity
2.34-2.40   
2.6-2.76   

Transparency
Opaque   
Opaque   

Density
Not Available   
2.6 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
1.12 kJ/Kg K   
7
Not Available   

Resistance
Heat Resistant   
Heat Resistant, Impact Resistant, Wear Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
China, India, Iran, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Vietnam   
Indonesia, Iran, Russia, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Vietnam   

Africa
Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa   
Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa   

Europe
Austria, Belgium, Finland, France, Germany, Italy, Norway, Sardinia, Spain, Switzerland   
England, Finland, Germany, Great Britain, Greece, United Kingdom   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
Canada, USA   

South America
Not Yet Found   
Colombia   

Deposits in Oceania Continent
  
  

Australia
Not Yet Found   
New Zealand, Queensland, Western Australia   

Summary >>
<< Reserves

All about Rhyodacite and Ijolite Properties

Know all about Rhyodacite and Ijolite properties here. All properties of rocks are important as they define the type of rock and its application. Rhyodacite and Ijolite belong to Igneous Rocks.Texture of Rhyodacite is Earthy whereas that of Ijolite is Earthy, Granular. Rhyodacite appears Skeletal and Ijolite appears Banded and Foilated. The luster of Rhyodacite and Ijolite is greasy to dull. Rhyodacite is available in black to grey, dark greenish - grey colors whereas Ijolite is available in brown, buff, cream, green, grey, pink, white colors. The commercial uses of Rhyodacite and Ijolite are cemetery markers, creating artwork.

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