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Migmatite and Felsite


Felsite and Migmatite


Definition

Definition
Migmatite is typically a granitic rock within a metamorphic host rock which is composed of two intermingled but distinguishable components   
Felsite is a very fine grained volcanic rock that may or may not contain larger crystals and light colored rock that typically requires petrographic examination or chemical analysis for more precise definition   

History
  
  

Origin
Southern Alps, France   
Unknown   

Discoverer
Jakob Sederholm   
Unknown   

Etymology
From the Greek word migma which means a mixture   
From English feldspar and -ite   

Class
Metamorphic Rocks   
Igneous Rocks   

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

Family
  
  

Group
Not Applicable   
Volcanic   

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

Texture

Texture
Foliated   
Arborescent Patterned, Vitreous   

Color
Black, Bluish - Grey, Brown, Brown- Black, Dark Greenish - Grey, Dark Grey to Black   
Black, Blue, Brown, Green, Orange, Red, Tan, Yellow   

Maintenance
More   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
No   
No   

Wind Resistant
No   
Yes   

Acid Resistant
No   
No   

Appearance
Dull, Banded and Foilated   
Layered, Banded, Veined and Shiny   

Uses

Architecture
  
  

Interior Uses
Countertops, Flooring, Kitchens   
Decorative Aggregates, Flooring, Interior Decoration   

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement   
Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points   

Medical Industry
Not Yet Used   
Surgery   

Antiquity Uses
Artifacts   
Artifacts   

Other Uses
  
  

Commercial Uses
Cemetery Markers, Jewelry, Tombstones, Used to manufracture paperweights and bookends   
Mirror, Jewelry   

Types

Types
Diatexites and Metatexites   
Not Available   

Features
Generally rough to touch, Is one of the oldest rock   
Available in Lots of Colors and Patterns, Clasts are smooth to touch, Splintery, Very fine grained rock   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Not Yet Used   

Famous Monuments
Not Applicable   
Not Applicable   

Sculpture
Not Yet Used   
Not Yet Used   

Famous Sculptures
Not Applicable   
Not Applicable   

Pictographs
Used   
Used   

Petroglyphs
Used   
Used   

Figurines
Not Yet Used   
Not Yet Used   

Fossils
Absent   
Absent   

Formation

Formation
Migmatites form by high temperature regional and thermal metamorphism of protolith rocks where rocks melt partially due to high temperature.   
Felsite 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
Biotite, Chlorite, Feldspar, Garnet, Graphite, Hornblade, Micas, Muscovite or Illite, Quartz, Quartzite, Silica, Zircon   
Feldspar, Iron Oxides   

Compound Content
Aluminium Oxide, NaCl, CaO, Carbon Dioxide, Iron(III) Oxide, FeO, Potassium Oxide, Magnesium Carbonate, MgO, MnO, Phosphorus Pentoxide, Silicon Dioxide, Titanium 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, Regional Metamorphism   
Burial 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, Glacier Erosion, Water Erosion, Wind Erosion   
Chemical Erosion, Glacier Erosion, Water Erosion   

Properties

Physical Properties
  
  

Hardness
5.5-6.5   
5-5.5   

Grain Size
Medium to Fine Coarse Grained   
Fine Grained   

Fracture
Irregular   
Conchoidal   

Streak
White   
White   

Porosity
Very Less Porous   
Very Less Porous   

Luster
Dull to Pearly to Subvitreous   
Vitreous   

Compressive Strength
Not Available   
0.15 N/mm2   
33

Cleavage
Poor   
Non-Existent   

Toughness
1.2   
Not Available   

Specific Gravity
2.65-2.75   
2.6-2.7   

Transparency
Opaque   
Translucent   

Density
Not Available   
2.6 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
Not Available   
0.92 kJ/Kg K   
10

Resistance
Heat Resistant, Pressure Resistant   
Heat Resistant, Impact Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
China, India, Iran, Iraq, Kazakhstan, Kyrgyzstan, Mongolia, Russia   
Afghanistan, Indonesia, Japan, Russia   

Africa
Cameroon, Ethiopia, Ghana, Kenya, Madagascar, Morocco, Mozambique, Namibia, Nigeria, Tanzania, Togo   
Kenya   

Europe
Albania, Austria, Bosnia and Herzegovina, Finland, France, Georgia, Germany, Hungary, Italy, Kosovo, Monaco, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, Sweden, Switzerland, Ukraine, United Kingdom   
Greece, Hungary, Iceland, Italy, Turkey   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, Costa Rica, Cuba, Mexico, Panama, USA   
Canada, Mexico, USA   

South America
Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Peru, Venezuela   
Argentina, Chile, Ecuador, Peru   

Deposits in Oceania Continent
  
  

Australia
New South Wales, New Zealand, Queensland, Victoria   
New Zealand   

Summary >>
<< Reserves

All about Migmatite and Felsite Properties

Know all about Migmatite and Felsite properties here. All properties of rocks are important as they define the type of rock and its application. Migmatite belongs to Metamorphic Rocks while Felsite belongs to Igneous Rocks.Texture of Migmatite is Foliated whereas that of Felsite is Arborescent Patterned, Vitreous. Migmatite appears Dull, Banded and Foilated and Felsite appears Layered, Banded, Veined and Shiny. The luster of Migmatite is dull to pearly to subvitreous while that of Felsite is vitreous. Migmatite is available in black, bluish - grey, brown, brown- black, dark greenish - grey, dark grey to black colors whereas Felsite is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Migmatite are cemetery markers, jewelry, tombstones, used to manufracture paperweights and bookends and that of Felsite are mirror, jewelry.

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