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Granulite and Rhyolite


Rhyolite and Granulite


Definition

Definition
Granulite is fine to medium grained metamorphic rock with a granular of polygonal crystals.   
Rhyolite is a fine-grained igneous rock which is rich in silica   

History
  
  

Origin
Central Europe   
North America   

Discoverer
Unknown   
Ferdinand von Richthofen   

Etymology
From Latin granulum, a little grain or fine grained   
From German Rhyolit, from Greek rhuax lava stream + lithos stone   

Class
Metamorphic Rocks   
Igneous Rocks   

Sub-Class
Durable Rock, Hard Rock   
Durable Rock, Hard Rock   

Family
  
  

Group
Not Applicable   
Volcanic   

Other Categories
Coarse Grained Rock, Medium Grained Rock, Opaque Rock   
Coarse Grained Rock, Opaque Rock   

Texture

Texture
Granoblastic   
Aphanitic, Glassy, Porphyritic   

Color
Black, Brown   
Grey, White, Light Black   

Maintenance
Less   
More   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
Yes   

Wind Resistant
No   
Yes   

Acid Resistant
No   
Yes   

Appearance
Veined or Pebbled   
Banded   

Uses

Architecture
  
  

Interior Uses
Bathrooms, Countertops, Decorative Aggregates, Entryways, Flooring, Homes, Hotels, Interior Decoration, Kitchens, Stair Treads   
Decorative Aggregates, Homes, Hotels, Interior Decoration, Kitchens   

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

Other Architectural Uses
Curbing   
Not Yet Used   

Industry
  
  

Construction Industry
As Dimension Stone, Building houses or walls   
Arrowheads, As Dimension Stone, Building houses or walls, Construction Aggregate, Cutting Tool, for Road Aggregate, Knives   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Monuments, Sculpture   
Artifacts   

Other Uses
  
  

Commercial Uses
Curling, Gemstone, Laboratory bench tops, Soil Conditioner, Tombstones   
Gemstone, Laboratory bench tops, Jewelry   

Types

Types
Not Available   
Pumice Rocks, Obsidian Rocks, Perlite Rocks, Porphyritic Rocks.   

Features
Clasts are smooth to touch   
Acidic in nature, Available in lots of colors   

Archaeological Significance
  
  

Monuments
Used   
Not Yet Used   

Famous Monuments
Data Not Available   
Not Applicable   

Sculpture
Used   
Not Yet Used   

Famous Sculptures
Data Not Available   
Not Applicable   

Pictographs
Not Used   
Not Used   

Petroglyphs
Not Used   
Not Used   

Figurines
Used   
Not Yet Used   

Fossils
Absent   
Absent   

Formation

Formation
Granulite is a fine-grained granular metamorphic rock in which the main component minerals are feldspars and quartz and forms at high temperature and pressure conditions.   
Rhyolite is a felsic extrusive rock and due to its high silica content, rhyolite lava is very viscous and is volcanic equivalent of granite.   

Composition
  
  

Mineral Content
Amphibole, Biotite, Feldspar, Hornblade, Micas, Muscovite or Illite, Plagioclase, Quartz   
Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz   

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

Transformation
  
  

Metamorphism
No   
Yes   

Types of Metamorphism
Not Applicable   
Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism   

Weathering
Yes   
Yes   

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

Erosion
Yes   
Yes   

Types of Erosion
Chemical Erosion, Water Erosion, Wind Erosion   
Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion   

Properties

Physical Properties
  
  

Hardness
6-7   
6-7   

Grain Size
Medium to Coarse Grained   
Large and Coarse Grained   

Fracture
Not Available   
Sub-conchoidal   

Streak
White   
Colorless   

Porosity
Very Less Porous   
Highly Porous   

Luster
Vitreous   
Earthy   

Compressive Strength
175.00 N/mm2   
13
140.00 N/mm2   
15

Cleavage
Imperfect   
Not Available   

Toughness
Not Available   
2   

Specific Gravity
2.8-3.0   
2.65-2.67   

Transparency
Opaque   
Opaque   

Density
3.06-3.33 g/cm3   
2.4-2.6 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
0.14 kJ/Kg K   
26
Not Available   

Resistance
Heat Resistant, Wear Resistant   
Heat Resistant, Wear Resistant   

Reserves

Deposits in Eastern Continents
  
  

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

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

Europe
Austria, Belgium, Finland, France, Germany, Italy, Norway, Sardinia, Spain, Switzerland, The Czech Republic, Venezuela   
Germany, Iceland, Ireland, Italy, Spain   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
Canada, USA   

South America
Not Yet Found   
Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela   

Deposits in Oceania Continent
  
  

Australia
Not Yet Found   
New Zealand, Queensland, Western Australia   

Summary >>
<< Reserves

All about Granulite and Rhyolite Properties

Know all about Granulite and Rhyolite properties here. All properties of rocks are important as they define the type of rock and its application. Granulite belongs to Metamorphic Rocks while Rhyolite belongs to Igneous Rocks.Texture of Granulite is Granoblastic whereas that of Rhyolite is Aphanitic, Glassy, Porphyritic. Granulite appears Veined or Pebbled and Rhyolite appears Banded. The luster of Granulite is vitreous while that of Rhyolite is earthy. Granulite is available in black, brown colors whereas Rhyolite is available in grey, white, light black colors. The commercial uses of Granulite are curling, gemstone, laboratory bench tops, soil conditioner, tombstones and that of Rhyolite are gemstone, laboratory bench tops, jewelry.

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