Definition
Marl is an unconsolidated sedimentary rock consisting of clay and lime
Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite).
Discoverer
William Smith
Unknown
Etymology
From Old French marle, from Late Latin marglia
from French néphéline, from Greek nephelē
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Hard Rock
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock
Color
Beige, Brown, Green, Grey, White
Black, Brown, Green, Grey, White
Durability
Durable
Durable
Appearance
Rough and Dull
Skeletal
Interior Uses
Decorative Aggregates, Floor Tiles
Decorative Aggregates, Homes, Interior Decoration
Exterior Uses
As Building Stone, Roof Tiles
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
Other Architectural Uses
Curbing
Curbing
Construction Industry
Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate
Antiquity Uses
Artifacts, Jewellery, Sculpture, Small Figurines
Artifacts, Monuments, Sculpture, Small Figurines
Commercial Uses
Creating Artwork, Soil Conditioner
Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)
Types
Clay Marl ,Blue Marl, Red Marl, High Bank Marl, Shell Layer Marl, Under Shell Layer Marl, Sand Marl, Green Marl, Grey Marl and Clayey Marl
Peralkaline Nephelinite
Features
Generally rough to touch, Is one of the oldest rock, Splintery, Very fine grained rock
Host Rock for Lead
Archaeological Significance
Formation
Marl forms when very fine-grained clay particles are deposited in water which settles at the bottom of water bodies and are compacted by overlying sediment; the water squeezes out and hence forming Marl rock.
Nephelinite 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
Calcite, Clay, Dolomite, Gypsum, Micas, Pyrite, Quartz
Clinopyroxene, Nepheline, Plagioclase
Compound Content
Aluminium Oxide, NaCl, CaO, Iron(III) Oxide, Silicon Dioxide
Ca, CaO, Carbon, Cl, MgO
Types of Metamorphism
-
Contact Metamorphism
Types of Weathering
Biological Weathering, Chemical Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Types of Erosion
Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion
Chemical Erosion, Water Erosion, Wind Erosion
Grain Size
Very fine-grained
Fine Grained
Porosity
Highly Porous
Less Porous
Luster
Dull
Vitreous to Metallic
Specific Gravity
2.2-2.8
2.4-2.9
Transparency
Opaque
Opaque
Density
2.4-2.8 g/cm3
2.5-3 g/cm3
Resistance
Heat Resistant, Impact Resistant
Heat Resistant
Deposits in Eastern Continents
Asia
India, Pakistan, Russia
Japan
Africa
Ethiopia, Kenya, Morocco, South Africa
Rwanda, Tanzania
Europe
Austria, France, Germany, Greece, Italy, Romania, Scotland, Spain, Switzerland
-
Deposits in Western Continents
North America
USA
Canada, USA
South America
Colombia, Ecuador, Peru
Colombia
Deposits in Oceania Continent
Australia
New South Wales, Victoria, Western Australia
-
All about Marl and Nephelinite Properties
Know all about Marl and Nephelinite properties here. All properties of rocks are important as they define the type of rock and its application. Marl belongs to Sedimentary Rocks while Nephelinite belongs to Igneous Rocks.Texture of Marl is Earthy whereas that of Nephelinite is Aphanitic. Marl appears Rough and Dull and Nephelinite appears Skeletal. The luster of Marl is dull while that of Nephelinite is vitreous to metallic. Marl is available in beige, brown, green, grey, white colors whereas Nephelinite is available in black, brown, green, grey, white colors. The commercial uses of Marl are creating artwork, soil conditioner and that of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo).