Definition
Lignite is a soft brownish coal which shows traces of plants and is intermediate between bituminous coal and peat
Lherzolite is a type of ultramafic igneous rock which contains essential olivine and clinopyroxene and orthopyroxene in equal proportions
Discoverer
Unknown
Unknown
Etymology
From French, Latin lignum wood + -ite1
From the Lherz Massif, an alpine peridotite complex, at Étang de Lers, near Massat in the French Pyrenees; Lherz is the archaic spelling of this location
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Hard Rock
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock
Texture
Amorphous, Glassy
Grenue
Color
Black, Brown, Dark Brown, Grey, Light to Dark Grey
Black, Dark Greenish - Grey, Green, Pink, Purple
Durability
Durable
Durable
Appearance
Veined or Pebbled
Glassy, Vesicular and Foilated
Interior Uses
-
Decorative Aggregates, Entryways, Homes, Interior Decoration
Exterior Uses
-
As Building Stone, As Facing Stone, Office Buildings
Other Architectural Uses
-
Curbing
Construction Industry
for Road Aggregate, Steel Production
Landscaping, Manufacture of Magnesium and Dolomite Refractories, Used for flooring, stair treads, borders and window sills.
Antiquity Uses
-
Artifacts, Sculpture
Commercial Uses
Electricity Generation
As armour rock for sea walls, Source of Magnesia (MgO), Used in aquariums
Types
Xyloid Lignite or Fossil Wood and Compact Lignite or Perfect Lignite
Garnet Lherzolite
Features
Generally rough to touch, Helps in production of Heat and Electricity, Used as fossil fuel
Host Rock for Lead
Archaeological Significance
Formation
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.
Lherzolite 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.
Mineral Content
-
Harzburgite, Olivine, Pyroxene, Pyrrhotite
Compound Content
Carbon, Hydrogen, Nitrogen, Oxygen, Sulphur
CaO, Cr, Chromium(III) Oxide, MgO
Types of Metamorphism
-
Cataclastic Metamorphism, Contact Metamorphism
Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Types of Erosion
Chemical Erosion, Water Erosion, Wind Erosion
Chemical Erosion, Water Erosion, Wind Erosion
Grain Size
Medium to Fine Coarse Grained
Fine Grained
Fracture
Conchoidal
Conchoidal
Porosity
Highly Porous
Less Porous
Luster
Dull to Vitreous to Submetallic
Subvitreous to Dull
Specific Gravity
1.1-1.4
2.86
Transparency
Opaque
Opaque
Density
800-801 g/cm3
2.8-2.9 g/cm3
Resistance
Heat Resistant
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
Deposits in Eastern Continents
Asia
Bangladesh, Burma, Cambodia, China, India, Indonesia, Kazakhstan, Malaysia, Mongolia, Pakistan, Turkey, Vietnam
Russia, South Korea
Africa
Botswana, Kenya, Morocco, Mozambique, South Africa, Tanzania
Western Africa
Europe
Belgium, Bulgaria, England, France, Germany, Greece, Hungary, Kosovo, Netherlands, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, The Czech Republic, Ukraine, United Kingdom
United Kingdom
Deposits in Western Continents
North America
Canada, Mexico, USA
USA
South America
Brazil, Chile, Colombia, Venezuela
-
Deposits in Oceania Continent
Australia
New South Wales, Queensland, Victoria
Central Australia, Western Australia
All about Lignite and Lherzolite Properties
Know all about Lignite and Lherzolite properties here. All properties of rocks are important as they define the type of rock and its application. Lignite belongs to Sedimentary Rocks while Lherzolite belongs to Igneous Rocks.Texture of Lignite is Amorphous, Glassy whereas that of Lherzolite is Grenue. Lignite appears Veined or Pebbled and Lherzolite appears Glassy, Vesicular and Foilated. The luster of Lignite is dull to vitreous to submetallic while that of Lherzolite is subvitreous to dull. Lignite is available in black, brown, dark brown, grey, light to dark grey colors whereas Lherzolite is available in black, dark greenish - grey, green, pink, purple colors. The commercial uses of Lignite are electricity generation and that of Lherzolite are as armour rock for sea walls, source of magnesia (mgo), used in aquariums.