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Norite and Picrite


Picrite and Norite


Definition

Definition
Norite is a mafic intrusive igneous rock composed largely of the calcium-rich plagioclase labradorite, orthopyroxene, and olivine   
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine   

History
  
  

Origin
Norway   
Hawaii Islands   

Discoverer
Unknown   
Unknown   

Etymology
From the Norwegian name for Norway, Norge   
From Greek pikros bitter + -ite, 19th century   

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   
Fine Grained Rock, Opaque Rock   

Texture

Texture
Phaneritic   
Earthy, Rough   

Color
Dark Grey to Black   
Black, Brown, Colourless, Green, Grey, Pink, White, Yellow   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
Yes   

Wind Resistant
Yes   
Yes   

Acid Resistant
Yes   
Yes   

Appearance
Veined and Shiny   
Rough and Shiny   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate   
As a Sintering Agent in Steel Industry to process Iron Ore, Cement Manufacture, for Road Aggregate, Manufacture of Magnesium and Dolomite Refractories, Roadstone, Used for flooring, stair treads, borders and window sills.   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Monuments, Sculpture   
Artifacts, Monuments, Sculpture   

Other Uses
  
  

Commercial Uses
Cemetery Markers, Commemorative Tablets, Laboratory bench tops, Jewelry, Sea Defence, Tombstones   
As a Feed Additive for Livestock, As armour rock for sea walls, Metallurgical Flux, Pottery, Source of Magnesia (MgO)   

Types

Types
Not Available   
Oceanite   

Features
Smooth to touch   
Host Rock for Lead   

Archaeological Significance
  
  

Monuments
Used   
Used   

Famous Monuments
Data Not Available   
Data Not Available   

Sculpture
Used   
Used   

Famous Sculptures
Data Not Available   
Data Not Available   

Pictographs
Not Used   
Not Used   

Petroglyphs
Not Used   
Not Used   

Figurines
Used   
Used   

Fossils
Absent   
Absent   

Formation

Formation
Norite 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.   
Picrite 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
Augite, Olivine, Plagioclase, Pyroxene   
Biotite, Olivine, Plagioclase, Pyrrhotite   

Compound Content
Aluminium Oxide, CaO, Chromium(III) Oxide, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Sulfur Trioxide   
Al, CaO, Carbon Dioxide, Mg, MgO   

Transformation
  
  

Metamorphism
Yes   
Yes   

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

Weathering
Yes   
Yes   

Types of Weathering
Biological Weathering   
Biological Weathering   

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
7   
6.8   

Grain Size
Coarse Grained   
Fine Grained   

Fracture
Conchoidal   
Uneven   

Streak
Black   
White, Greenish White or Grey   

Porosity
Highly Porous   
Less Porous   

Luster
Not Available   
Subvitreous to Dull   

Compressive Strength
225.00 N/mm2   
7
189.00 N/mm2   
11

Cleavage
Not Available   
Imperfect   

Toughness
1.6   
2.1   

Specific Gravity
2.86-2.87   
2.75-2.92   

Transparency
Opaque   
Opaque   

Density
2.7-3.3 g/cm3   
1.5-2.5 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
Not Available   
0.88 kJ/Kg K   
13

Resistance
Impact Resistant, Pressure Resistant, Wear Resistant   
Heat Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
India, Russia   
India, Russia   

Africa
South Africa   
South Africa   

Europe
Germany, Greece, Italy, Scotland, Turkey   
Iceland   

Others
Greenland   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
Canada, USA   

South America
Brazil, Colombia, Venezuela   
Brazil   

Deposits in Oceania Continent
  
  

Australia
New Zealand, Queensland   
Not Yet Found   

Summary >>
<< Reserves

All about Norite and Picrite Properties

Know all about Norite and Picrite properties here. All properties of rocks are important as they define the type of rock and its application. Norite and Picrite belong to Igneous Rocks.Texture of Norite is Phaneritic whereas that of Picrite is Earthy, Rough. Norite appears Veined and Shiny and Picrite appears Rough and Shiny. The luster of Norite is not available while that of Picrite is subvitreous to dull. Norite is available in dark grey to black colors whereas Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors. The commercial uses of Norite are cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones and that of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo).

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