Definition
Scoria is a dark-colored extrusive igneous rock with abundant round bubble-like cavities
  
Lignite is a soft brownish coal which shows traces of plants and is intermediate between bituminous coal and peat
  
History
  
  
Origin
Unknown
  
France
  
Discoverer
Unknown
  
Unknown
  
Etymology
From late Middle English (denoting slag from molten metal), from Greek skōria refuse, from skōr dung
  
From French, Latin lignum wood + -ite1
  
Class
Igneous Rocks
  
Sedimentary Rocks
  
Sub-Class
Durable Rock, Medium Hardness Rock
  
Durable Rock, Soft Rock
  
Family
  
  
Group
Volcanic
  
Not Applicable
  
Other Categories
Fine Grained Rock, Opaque Rock
  
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
  
Texture
Vesicular
  
Amorphous, Glassy
  
Color
Black, Brown, Dark Grey to Black, Red
  
Black, Brown, Dark Brown, Grey, Light to Dark Grey
  
Maintenance
More
  
Less
  
Durability
Durable
  
Durable
  
Water Resistant
Yes
  
No
  
Scratch Resistant
Yes
  
No
  
Stain Resistant
No
  
No
  
Wind Resistant
No
  
No
  
Acid Resistant
No
  
No
  
Appearance
Glassy and Vesicular
  
Veined or Pebbled
  
Architecture
  
  
Interior Uses
Decorative Aggregates, Interior Decoration
  
Not Yet Used
  
Exterior Uses
Garden Decoration, Paving Stone
  
Not Yet Used
  
Other Architectural Uses
Curbing
  
Not Yet Used
  
Industry
  
  
Construction Industry
Cement Manufacture, Construction Aggregate, for Road Aggregate, In landscaping and drainage works
  
for Road Aggregate, Steel Production
  
Medical Industry
Not Yet Used
  
Not Yet Used
  
Antiquity Uses
Artifacts, Monuments, Sculpture
  
Not Yet Used
  
Other Uses
  
  
Commercial Uses
As a traction material on snow-covered roads, Creating Artwork, High-temperature insulation, In gas barbecue grills
  
Electricity Generation
  
Types
Not Available
  
Xyloid Lignite or Fossil Wood and Compact Lignite or Perfect Lignite
  
Features
Available in Lots of Colors and Patterns, Generally rough to touch, Surfaces are often shiny
  
Generally rough to touch, Helps in production of Heat and Electricity, Used as fossil fuel
  
Archaeological Significance
  
  
Monuments
Used
  
Not Yet Used
  
Famous Monuments
Data Not Available
  
Not Applicable
  
Sculpture
Used
  
Not Yet Used
  
Famous Sculptures
Data Not Available
  
Not Applicable
  
Pictographs
Used
  
Used
  
Petroglyphs
Used
  
Used
  
Figurines
Used
  
Not Yet Used
  
Fossils
Absent
  
Present
  
Formation
Scoria forms when magma containing huge amount of dissolved gas flows from a volcano during an eruption.
  
Coal formation takes place due to accumulation of plant debris in a swamp environment. The Coal formation process continues, as peat turns into lignite brown or black coal at increasing heat and pressure.
  
Composition
  
  
Mineral Content
Apatite, Biotite, Calcite, Feldspar, Hematite, Hornblade, Ilmenite, Magnetite, Olivine, Pyroxene, Quartz, Silica
  
Not Available
  
Compound Content
Ca, NaCl
  
Carbon, Hydrogen, Nitrogen, Oxygen, Sulphur
  
Transformation
  
  
Metamorphism
Yes
  
No
  
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism
  
Not Applicable
  
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, Coastal Erosion, Glacier Erosion
  
Chemical Erosion, Water Erosion, Wind Erosion
  
Physical Properties
  
  
Hardness
5-6
  
1
  
Grain Size
Fine Grained
  
Medium to Fine Coarse Grained
  
Fracture
Conchoidal
  
Conchoidal
  
Streak
White
  
Black
  
Porosity
Highly Porous
  
Highly Porous
  
Luster
Subvitreous to Dull
  
Dull to Vitreous to Submetallic
  
Cleavage
Perfect
  
Non-Existent
  
Toughness
2.1
  
Not Available
  
Specific Gravity
Not Available
  
1.1-1.4
  
Transparency
Opaque
  
Opaque
  
Density
Not Available
  
800-801 g/cm3
  
Thermal Properties
  
  
Specific Heat Capacity
Not Available
  
1.26 kJ/Kg K
  
5
Resistance
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
  
Heat Resistant
  
Deposits in Eastern Continents
  
  
Asia
Afghanistan, Indonesia, Japan, Russia
  
Bangladesh, Burma, Cambodia, China, India, Indonesia, Kazakhstan, Malaysia, Mongolia, Pakistan, Turkey, Vietnam
  
Africa
Ethiopia, Kenya, Tanzania
  
Botswana, Kenya, Morocco, Mozambique, South Africa, Tanzania
  
Europe
Greece, Hungary, Iceland, Italy, Turkey
  
Belgium, Bulgaria, England, France, Germany, Greece, Hungary, Kosovo, Netherlands, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, The Czech Republic, Ukraine, United Kingdom
  
Others
Not Yet Found
  
Not Yet Found
  
Deposits in Western Continents
  
  
North America
Bahamas, Barbados, Canada, Costa Rica, Cuba, Jamaica, Mexico, USA
  
Canada, Mexico, USA
  
South America
Argentina, Chile, Ecuador, Peru
  
Brazil, Chile, Colombia, Venezuela
  
Deposits in Oceania Continent
  
  
Australia
New Zealand, Western Australia
  
New South Wales, Queensland, Victoria