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Picrite and Scoria


Scoria and Picrite


Definition

Definition
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine   
Scoria is a dark-colored extrusive igneous rock with abundant round bubble-like cavities   

History
  
  

Origin
Hawaii Islands   
Unknown   

Discoverer
Unknown   
Unknown   

Etymology
From Greek pikros bitter + -ite, 19th century   
From late Middle English (denoting slag from molten metal), from Greek skōria refuse, from skōr dung   

Class
Igneous Rocks   
Igneous Rocks   

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

Family
  
  

Group
Volcanic   
Volcanic   

Other Categories
Fine Grained Rock, Opaque Rock   
Fine Grained Rock, Opaque Rock   

Texture

Texture
Earthy, Rough   
Vesicular   

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

Maintenance
Less   
More   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
No   

Wind Resistant
Yes   
No   

Acid Resistant
Yes   
No   

Appearance
Rough and Shiny   
Glassy and Vesicular   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
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.   
Cement Manufacture, Construction Aggregate, for Road Aggregate, In landscaping and drainage works   

Medical Industry
Not Yet Used   
Not Yet Used   

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

Other Uses
  
  

Commercial Uses
As a Feed Additive for Livestock, As armour rock for sea walls, Metallurgical Flux, Pottery, Source of Magnesia (MgO)   
As a traction material on snow-covered roads, Creating Artwork, High-temperature insulation, In gas barbecue grills   

Types

Types
Oceanite   
Not Available   

Features
Host Rock for Lead   
Available in Lots of Colors and Patterns, Generally rough to touch, Surfaces are often shiny   

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   
Used   

Petroglyphs
Not Used   
Used   

Figurines
Used   
Used   

Fossils
Absent   
Absent   

Formation

Formation
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.   
Scoria forms when magma containing huge amount of dissolved gas flows from a volcano during an eruption.   

Composition
  
  

Mineral Content
Biotite, Olivine, Plagioclase, Pyrrhotite   
Apatite, Biotite, Calcite, Feldspar, Hematite, Hornblade, Ilmenite, Magnetite, Olivine, Pyroxene, Quartz, Silica   

Compound Content
Al, CaO, Carbon Dioxide, Mg, MgO   
Ca, NaCl   

Transformation
  
  

Metamorphism
Yes   
Yes   

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

Weathering
Yes   
Yes   

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

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
6.8   
5-6   

Grain Size
Fine Grained   
Fine Grained   

Fracture
Uneven   
Conchoidal   

Streak
White, Greenish White or Grey   
White   

Porosity
Less Porous   
Highly Porous   

Luster
Subvitreous to Dull   
Subvitreous to Dull   

Compressive Strength
189.00 N/mm2   
11
Not Available   

Cleavage
Imperfect   
Perfect   

Toughness
2.1   
2.1   

Specific Gravity
2.75-2.92   
Not Available   

Transparency
Opaque   
Opaque   

Density
1.5-2.5 g/cm3   
Not Available   

Thermal Properties
  
  

Specific Heat Capacity
0.88 kJ/Kg K   
13
Not Available   

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

Reserves

Deposits in Eastern Continents
  
  

Asia
India, Russia   
Afghanistan, Indonesia, Japan, Russia   

Africa
South Africa   
Ethiopia, Kenya, Tanzania   

Europe
Iceland   
Greece, Hungary, Iceland, Italy, Turkey   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
Bahamas, Barbados, Canada, Costa Rica, Cuba, Jamaica, Mexico, USA   

South America
Brazil   
Argentina, Chile, Ecuador, Peru   

Deposits in Oceania Continent
  
  

Australia
Not Yet Found   
New Zealand, Western Australia   

Summary >>
<< Reserves

All about Picrite and Scoria Properties

Know all about Picrite and Scoria properties here. All properties of rocks are important as they define the type of rock and its application. Picrite and Scoria belong to Igneous Rocks.Texture of Picrite is Earthy, Rough whereas that of Scoria is Vesicular. Picrite appears Rough and Shiny and Scoria appears Glassy and Vesicular. The luster of Picrite and Scoria is subvitreous to dull. Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors whereas Scoria is available in black, brown, dark grey to black, red colors. The commercial uses of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo) and that of Scoria are as a traction material on snow-covered roads, creating artwork, high-temperature insulation, in gas barbecue grills.

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