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Rapakivi Granite vs Tephrite


Tephrite vs Rapakivi Granite


Definition

Definition
Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase  
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock  

History
  
  

Origin
Finland, Europe  
Germany  

Discoverer
Jakob Sederholm  
Van Tooren  

Etymology
From Finnish Rapakivi which stands for crumbly rock  
From Greek tephra, ashes from Indo-European base, to burn  

Class
Igneous Rocks  
Igneous Rocks  

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

Family
  
  

Group
Plutonic  
Volcanic  

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

Texture

Texture
Granular, Phaneritic  
Aphanitic to Porphyritic  

Color
Black, Grey, Orange, Pink, White  
Black, Brown, Green, Grey, White  

Maintenance
More  
Less  

Durability
Durable  
Durable  

Water Resistant
Yes  
Yes  

Scratch Resistant
Yes  
Yes  

Stain Resistant
Yes  
No  

Wind Resistant
No  
Yes  

Acid Resistant
Yes  
No  

Appearance
Veined or Pebbled  
Vesicular  

Uses

Architecture
  
  

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

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

Other Architectural Uses
-  
Curbing  

Industry
  
  

Construction Industry
As Dimension Stone  
Landscaping  

Medical Industry
-  
-  

Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines  
Artifacts, Sculpture  

Other Uses
  
  

Commercial Uses
Cemetery Markers, Commemorative Tablets, Creating Artwork, Curling, Laboratory bench tops, Tombstones  
Production of Lime, Soil Conditioner  

Types

Types
Igneous Protolith Granite, Sedimentary Protolith Granite, Mantle Granite, Anorogenic Granite and Hybrid Granite  
Igneous rock  

Features
Available in Lots of Colors and Patterns, It is One of the Oldest, Strongest and Hardest Rock  
Host Rock for Lead  

Archaeological Significance
  
  

Monuments
-  
-  

Famous Monuments
-  
-  

Sculpture
-  
-  

Famous Sculptures
-  
-  

Pictographs
-  
-  

Petroglyphs
-  
-  

Figurines
-  
-  

Fossils
Absent  
Absent  

Formation

Formation
Granite is an igneous rock which is very hard, crystalline and is visibly homogeneous in texture and forms by melting of continental rocks  
Tephrite 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, Biotite, Feldspar, Hornblade, Micas, Muscovite or Illite, Plagioclase, Pyroxene, Quartz  
Alkali feldspar, Nepheline, Plagioclase, Pyroxene  

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

Transformation
  
  

Metamorphism
Yes  
Yes  

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

Weathering
Yes  
Yes  

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

Erosion
Yes  
Yes  

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

Properties

Physical Properties
  
  

Hardness
6-7  
6.5  

Grain Size
Large and Coarse Grained  
Medium to Fine Coarse Grained  

Fracture
-  
Uneven  

Streak
White  
Bluish Black  

Porosity
Less Porous  
Very Less Porous  

Luster
Dull to Grainy with Sporadic parts Pearly and Vitreous  
Subvitreous to Dull  

Compressive Strength
175.00 N/mm2  
20
90.00 N/mm2  
32

Cleavage
-  
Crenulation and Pervasive  

Toughness
-  
2.4  

Specific Gravity
2.6-2.7  
2.86  

Transparency
Opaque  
Opaque  

Density
2.6-2.8 g/cm3  
2.8-2.9 g/cm3  

Thermal Properties
  
  

Specific Heat Capacity
0.79 kJ/Kg K  
17
0.92 kJ/Kg K  
10

Resistance
Heat Resistant, Wear Resistant  
Heat Resistant, Impact Resistant  

Reserves

Deposits in Eastern Continents
  
  

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

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

Europe
Austria, Belgium, Finland, France, Germany, Italy, Norway, Sardinia, Spain, Switzerland, The Czech Republic  
Germany, Hungary, Italy, Portugal, Spain  

Others
-  
-  

Deposits in Western Continents
  
  

North America
Canada, USA  
USA  

South America
-  
-  

Deposits in Oceania Continent
  
  

Australia
-  
New Zealand, Western Australia  

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Rapakivi Granite vs Tephrite Information

Earth’s outer layer is covered by rocks and these rocks have different physical and chemical properties. As two rocks are not same, it’s fun to compare them. You can also know more about Rapakivi Granite and Tephrite Reserves. Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase. Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock. These rocks are composed of many distinct minerals. The process of formation of rocks is different for various rocks. Rocks are quarried from many years for various purposes. You can check out Rapakivi Granite vs Tephrite information and Rapakivi Granite vs Tephrite characteristics in the upcoming sections.

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Rapakivi Granite vs Tephrite Characteristics

Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Rapakivi Granite vs Tephrite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Rapakivi Granite and Properties of Tephrite. Learn more about Rapakivi Granite vs Tephrite in the next section. The interior uses of Rapakivi Granite include Bathrooms, Countertops, Decorative aggregates, Entryways, Floor tiles, Flooring, Homes, Hotels, Interior decoration, Kitchens and Stair treads whereas the interior uses of Tephrite include Decorative aggregates, Flooring, Homes and Interior decoration. Due to some exceptional properties of Rapakivi Granite and Tephrite, they have various applications in construction industry. The uses of Rapakivi Granite in construction industry include As dimension stone and that of Tephrite include Landscaping.

More about Rapakivi Granite and Tephrite

Here you can know more about Rapakivi Granite and Tephrite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Rapakivi Granite and Tephrite consists of mineral content and compound content. The mineral content of Rapakivi Granite includes Amphibole, Biotite, Feldspar, Hornblade, Micas, Muscovite or Illite, Plagioclase, Pyroxene, Quartz and mineral content of Tephrite includes Alkali feldspar, Nepheline, Plagioclase, Pyroxene. You can also check out the list of all Igneous Rocks. When we have to compare Rapakivi Granite vs Tephrite, the texture, color and appearance plays an important role in determining the type of rock. Rapakivi Granite is available in black, grey, orange, pink, white colors whereas, Tephrite is available in black, brown, green, grey, white colors. Appearance of Rapakivi Granite is Veined or Pebbled and that of Tephrite is Vesicular. Properties of rock is another aspect for Rapakivi Granite vs Tephrite. The hardness of Rapakivi Granite is 6-7 and that of Tephrite is 6.5. The types of Rapakivi Granite are Igneous Protolith Granite, Sedimentary Protolith Granite, Mantle Granite, Anorogenic Granite and Hybrid Granite whereas types of Tephrite are Igneous rock. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Rapakivi Granite is white while that of Tephrite is bluish black. The specific heat capacity of Rapakivi Granite is 0.79 kJ/Kg K and that of Tephrite is 0.92 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Rapakivi Granite is heat resistant, wear resistant whereas Tephrite is heat resistant, impact resistant.

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