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Taconite and Gneiss


Gneiss and Taconite


Definition

Definition
Taconite is a low-grade iron ore which belongs to sedimentary rock and containing about 27% iron and 51% silica  
Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks  

History
  
  

Origin
Western Australia, Minnesota  
-  

Discoverer
Newton Horace Winchell  
Unknown  

Etymology
From the name of Taconic Mountains in New England  
From the Middle High German verb gneist (to spark; so called because the rock glitters)  

Class
Sedimentary Rocks  
Metamorphic Rocks  

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

Family
  
  

Group
-  
-  

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

Texture

Texture
Banded, Trellis  
Banded, Foliated, Platy  

Color
Red, Reddish Brown  
Black, Brown, Pink, Red, White  

Maintenance
Less  
More  

Durability
Durable  
Durable  

Water Resistant
Yes  
Yes  

Scratch Resistant
Yes  
Yes  

Stain Resistant
No  
Yes  

Wind Resistant
Yes  
Yes  

Acid Resistant
No  
No  

Appearance
Layered, Banded, Veined and Shiny  
Foliated  

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration  
Countertops, Decorative Aggregates, Flooring, Interior Decoration  

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

Other Architectural Uses
Curbing  
Curbing  

Industry
  
  

Construction Industry
As Dimension Stone, Used for flooring, stair treads, borders and window sills.  
As Dimension Stone  

Medical Industry
-  
-  

Antiquity Uses
Artifacts  
Artifacts  

Other Uses
  
  

Commercial Uses
As a touchstone, Cemetery Markers, Creating Artwork  
Cemetery Markers, Jewelry, Tombstones, Used in aquariums  

Types

Types
Iron formation  
Augen Gneiss, Henderson Gneiss, Lewisian Gneiss, Archean and Proterozoic Gneiss.  

Features
Is one of the oldest rock  
Generally rough to touch, Is one of the oldest rock  

Archaeological Significance
  
  

Monuments
-  
-  

Famous Monuments
-  
Konark Sun Temple in India, Washington Monument, US  

Sculpture
-  
-  

Famous Sculptures
-  
-  

Pictographs
-  
-  

Petroglyphs
-  
-  

Figurines
-  
-  

Fossils
Present  
Absent  

Formation

Formation
Taconite is a type of sedimentary rock formed when a river carries or transports pieces of broken rock as it flows. When the river reaches a lake or sea, its load of transported rocks settles or deposits at the bottom of sea or lake.   
Gneiss is a high grade metamorphic rock i.e. it has been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of Gneiss forms from volcanic rock, shale or granitie.   

Composition
  
  

Mineral Content
Hematite, Magnetite, Quartz  
Biotite, Chlorite, Feldspar, Garnet, Graphite, Hornblade, Micas, Muscovite or Illite, Quartz, Quartzite, Silica, Zircon  

Compound Content
Fe, Iron(III) Oxide, Silicon Dioxide  
Aluminium Oxide, NaCl, CaO, Iron(III) Oxide, FeO, Potassium Oxide, Magnesium Carbonate, MgO, MnO, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide  

Transformation
  
  

Metamorphism
No  
Yes  

Types of Metamorphism
-  
Impact Metamorphism  

Weathering
Yes  
Yes  

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

Erosion
Yes  
Yes  

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

Properties

Physical Properties
  
  

Hardness
5.5-6  
7  

Grain Size
Large and Coarse Grained  
Medium to Coarse Grained  

Fracture
Uneven, Splintery or Conchoidal  
Irregular  

Streak
White  
White  

Porosity
Highly Porous  
Very Less Porous  

Luster
Earthy  
Dull  

Compressive Strength
190.00 N/mm2  
15
125.00 N/mm2  
25

Cleavage
-  
-  

Toughness
1.5  
1.2  

Specific Gravity
5-5.3  
2.5-2.7  

Transparency
Translucent to Opaque  
Translucent to Opaque  

Density
-9999 g/cm3  
2.6-2.9 g/cm3  

Thermal Properties
  
  

Specific Heat Capacity
3.20 kJ/Kg K  
1
0.70 kJ/Kg K  
24

Resistance
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant  
Heat Resistant, Pressure Resistant, Scratch Resistant, Wear Resistant  

Reserves

Deposits in Eastern Continents
  
  

Asia
China, India, Iran, Iraq, Oman, Russia, Saudi Arabia, Taiwan, Thailand, Vietnam  
China, India, Iran, Iraq, Kazakhstan, Kyrgyzstan, Mongolia, Russia  

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

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

Others
Greenland, Mid-Atlantic Ridge  
-  

Deposits in Western Continents
  
  

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

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

Deposits in Oceania Continent
  
  

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

Summary >>
<< Reserves

All about Taconite and Gneiss Properties

Know all about Taconite and Gneiss properties here. All properties of rocks are important as they define the type of rock and its application. Taconite belongs to Sedimentary Rocks while Gneiss belongs to Metamorphic Rocks.Texture of Taconite is Banded, Trellis whereas that of Gneiss is Banded, Foliated, Platy. Taconite appears Layered, Banded, Veined and Shiny and Gneiss appears Foliated. The luster of Taconite is earthy while that of Gneiss is dull. Taconite is available in red, reddish brown colors whereas Gneiss is available in black, brown, pink, red, white colors. The commercial uses of Taconite are as a touchstone, cemetery markers, creating artwork and that of Gneiss are cemetery markers, jewelry, tombstones, used in aquariums.

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