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Migmatite and Gossan


Gossan and Migmatite


Definition

Definition
Migmatite is typically a granitic rock within a metamorphic host rock which is composed of two intermingled but distinguishable components   
Gossan is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein.   

History
  
  

Origin
Southern Alps, France   
Indonesia   

Discoverer
Jakob Sederholm   
Cornish Gossen   

Etymology
From the Greek word migma which means a mixture   
From Cornish gossen from gos, blood from Old Cornish guit   

Class
Metamorphic Rocks   
Metamorphic Rocks   

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

Family
  
  

Group
Not Applicable   
Not Applicable   

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

Texture

Texture
Foliated   
Rough, Sandy   

Color
Black, Bluish - Grey, Brown, Brown- Black, Dark Greenish - Grey, Dark Grey to Black   
Brown, Brown- Black, Gold, Green, Rust   

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
Dull, Banded and Foilated   
Dull and Banded   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement   
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts   
Artifacts   

Other Uses
  
  

Commercial Uses
Cemetery Markers, Jewelry, Tombstones, Used to manufracture paperweights and bookends   
Cemetery Markers, Commemorative Tablets, Gemstone   

Types

Types
Diatexites and Metatexites   
Translocated gossan and Leakage gossan   

Features
Generally rough to touch, Is one of the oldest rock   
Clasts are smooth to touch, Easily splits into thin plates   

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.   
Earth movements can cause rocks to be either deeply buried or squeezed and hence the rocks are heated and put under great pressure.   

Composition
  
  

Mineral Content
Biotite, Chlorite, Feldspar, Garnet, Graphite, Hornblade, Micas, Muscovite or Illite, Quartz, Quartzite, Silica, Zircon   
Apatite, Augite, Biotite, Bronzite, Calcite, Chert, Epidote, Feldspar, Hornblende, Micas, Plagioclase, Pyroxene, Quartz, Sulfides, Zircon   

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, Fe, FeO, Silicon Dioxide, Sulphur   

Transformation
  
  

Metamorphism
Yes   
No   

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

Weathering
Yes   
No   

Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering   
Not Applicable   

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
5.5-6.5   
4-5   

Grain Size
Medium to Fine Coarse Grained   
Fine to Medium Grained   

Fracture
Irregular   
Conchoidal   

Streak
White   
White to Grey   

Porosity
Very Less Porous   
Highly Porous   

Luster
Dull to Pearly to Subvitreous   
Metallic   

Cleavage
Poor   
Not Available   

Toughness
1.2   
Not Available   

Specific Gravity
2.65-2.75   
2.0   

Transparency
Opaque   
Opaque   

Density
Not Available   
Not Available   

Thermal Properties
  
  

Specific Heat Capacity
Not Available   
0.24 kJ/Kg K   
24

Resistance
Heat Resistant, Pressure Resistant   
Heat Resistant, Impact Resistant, Pressure Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
China, India, Iran, Iraq, Kazakhstan, Kyrgyzstan, Mongolia, Russia   
China, India, Indonesia, Russia, Singapore, South Korea   

Africa
Cameroon, Ethiopia, Ghana, Kenya, Madagascar, Morocco, Mozambique, Namibia, Nigeria, Tanzania, Togo   
Cape Verde, Ethiopia, Ghana, South Africa, Western Africa   

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   
Albania, France, Germany, Great Britain, United Kingdom   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

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

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

Deposits in Oceania Continent
  
  

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

Summary >>
<< Reserves

All about Migmatite and Gossan Properties

Know all about Migmatite and Gossan properties here. All properties of rocks are important as they define the type of rock and its application. Migmatite and Gossan belong to Metamorphic Rocks.Texture of Migmatite is Foliated whereas that of Gossan is Rough, Sandy. Migmatite appears Dull, Banded and Foilated and Gossan appears Dull and Banded. The luster of Migmatite is dull to pearly to subvitreous while that of Gossan is metallic. Migmatite is available in black, bluish - grey, brown, brown- black, dark greenish - grey, dark grey to black colors whereas Gossan is available in brown, brown- black, gold, green, rust colors. The commercial uses of Migmatite are cemetery markers, jewelry, tombstones, used to manufracture paperweights and bookends and that of Gossan are cemetery markers, commemorative tablets, gemstone.

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