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Rhyodacite and Mugearite


Mugearite and Rhyodacite


Definition

Definition
Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite   
Mugearite is a type of oligoclase bearing basalt, also comprising of olivine, apatite, and opaque oxides   

History
  
  

Origin
USA   
Skye, Scotland   

Discoverer
Unknown   
Alfred Harker   

Etymology
Rhyo lite + dacite : a rock intermediate between rhyolite and dacite that is the extrusive equivalent of granodiorite   
From mugear +‎ -ite   

Class
Igneous Rocks   
Igneous Rocks   

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

Family
  
  

Group
Volcanic   
Volcanic   

Other Categories
Fine Grained Rock, Opaque Rock   
Opaque Rock   

Texture

Texture
Earthy   
Glassy, Massive, Porphyritic, Scoriaceous, Vesicular   

Color
Black to Grey, Dark Greenish - Grey   
Black, Brown, Light to Dark Grey   

Maintenance
More   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
No   
Yes   

Wind Resistant
No   
No   

Acid Resistant
No   
No   

Appearance
Skeletal   
Dull and Soft   

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Interior Decoration   
Floor Tiles, Flooring, Homes, Hotels   

Exterior Uses
As Building Stone, Garden Decoration   
As Building Stone, Garden Decoration   

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping   
As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts   
Artifacts, Monuments, Sculpture   

Other Uses
  
  

Commercial Uses
Cemetery Markers, Creating Artwork   
Creating Artwork   

Types

Types
Not Available   
Alkaline Basalt, Boninite, High Alumina Basalt, Mid Ocean Ridge Basalt (MORB), Tholeiitic Basalt, Basaltic trachyandesite, Mugearite and Shoshonite   

Features
Available in Lots of Colors and Patterns   
Has High structural resistance against erosion and climate, Very fine grained 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.   
Mugearite forms when lava reaches the Earth's surface near an active volcano. The temperature of lava is between 1100 to 1250° C when it gets to the surface.   

Composition
  
  

Mineral Content
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon   
Olivine, Plagioclase, Pyroxene   

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, Titanium Dioxide   

Transformation
  
  

Metamorphism
Yes   
Yes   

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

Weathering
Yes   
Yes   

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

Erosion
Yes   
No   

Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion   
Not Applicable   

Properties

Physical Properties
  
  

Hardness
5.5-6   
6   

Grain Size
Fine Grained   
Not Applicable   

Fracture
Conchoidal   
Conchoidal   

Streak
Black   
White to Grey   

Porosity
Less Porous   
Less Porous   

Luster
Greasy to Dull   
Not Available   

Compressive Strength
200.50 N/mm2   
9
37.50 N/mm2   
27

Cleavage
Not Available   
Not Applicable   

Toughness
2.1   
2.3   

Specific Gravity
2.34-2.40   
2.8-3   

Transparency
Opaque   
Opaque   

Density
Not Available   
2.9-3.1 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
1.12 kJ/Kg K   
7
0.84 kJ/Kg K   
15

Resistance
Heat Resistant   
Heat Resistant, Pressure Resistant, Wear Resistant   

Reserves

Deposits in Eastern Continents
  
  

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

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

Europe
Austria, Belgium, Finland, France, Germany, Italy, Norway, Sardinia, Spain, Switzerland   
Iceland   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
Canada, USA   

South America
Not Yet Found   
Brazil   

Deposits in Oceania Continent
  
  

Australia
Not Yet Found   
Not Yet Found   

Summary >>
<< Reserves

All about Rhyodacite and Mugearite Properties

Know all about Rhyodacite and Mugearite properties here. All properties of rocks are important as they define the type of rock and its application. Rhyodacite and Mugearite belong to Igneous Rocks.Texture of Rhyodacite is Earthy whereas that of Mugearite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular. Rhyodacite appears Skeletal and Mugearite appears Dull and Soft. The luster of Rhyodacite is greasy to dull while that of Mugearite is not available. Rhyodacite is available in black to grey, dark greenish - grey colors whereas Mugearite is available in black, brown, light to dark grey colors. The commercial uses of Rhyodacite and Mugearite are cemetery markers, creating artwork.

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