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Marl and Hornfels


Hornfels and Marl


Definition

Definition
Marl is an unconsolidated sedimentary rock consisting of clay and lime   
Hornfels is a metamorphic rock formed by the contact between mudstone or other clay rich rock, and a hot igneous body, and represents a heat altered equivalent of the original rock   

History
  
  

Origin
Unknown   
New Zealand   

Discoverer
Unknown   
Unknown   

Etymology
From Old French marle, from Late Latin marglia   
From German which means hornstone   

Class
Sedimentary Rocks   
Metamorphic Rocks   

Sub-Class
Durable Rock, Soft Rock   
Durable Rock, Soft Rock   

Family
  
  

Group
Not Applicable   
Not Applicable   

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

Texture

Texture
Earthy   
Granular, Platy   

Color
Beige, Brown, Green, Grey, White   
Brown, Dark Greenish - Grey, Green, Reddish Brown   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
No   
No   

Stain Resistant
No   
No   

Wind Resistant
No   
No   

Acid Resistant
No   
No   

Appearance
Rough and Dull   
Dull   

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Floor Tiles   
Decorative Aggregates, Flooring, 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   

Industry
  
  

Construction Industry
Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar   
for Road Aggregate, Roadstone   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Jewellery, Sculpture, Small Figurines   
Artifacts, Monuments   

Other Uses
  
  

Commercial Uses
Creating Artwork, Soil Conditioner   
Cemetery Markers, Commemorative Tablets, Creating Artwork   

Types

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   
Biotite hornfels   

Features
Generally rough to touch, Is one of the oldest rock, Splintery, Very fine grained rock   
Smooth to touch   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Used   

Famous Monuments
Not Applicable   
Data Not Available   

Sculpture
Used   
Not Yet Used   

Famous Sculptures
Data Not Available   
Not Applicable   

Pictographs
Used   
Used   

Petroglyphs
Used   
Used   

Figurines
Used   
Not Yet Used   

Fossils
Present   
Absent   

Formation

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.   
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Hornfels is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.   

Composition
  
  

Mineral Content
Calcite, Clay, Dolomite, Gypsum, Micas, Pyrite, Quartz   
Andalusite   

Compound Content
Aluminium Oxide, NaCl, CaO, Iron(III) Oxide, Silicon Dioxide   
Fe, Mg   

Transformation
  
  

Metamorphism
No   
No   

Types of Metamorphism
Not Applicable   
Not Applicable   

Weathering
Yes   
Yes   

Types of Weathering
Biological Weathering, Chemical Weathering   
Biological Weathering   

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
2-3   
2-3   

Grain Size
Very fine-grained   
Fine Grained   

Fracture
Conchoidal   
Conchoidal   

Streak
White   
Unknown   

Porosity
Highly Porous   
Highly Porous   

Luster
Dull   
Shiny   

Compressive Strength
Not Available   
5.80 N/mm2   
31

Cleavage
Not Available   
Perfect   

Toughness
2.6   
Not Yet Found   

Specific Gravity
2.2-2.8   
3.4-3.9   

Transparency
Opaque   
Opaque   

Density
2.4-2.8 g/cm3   
0.25-0.30 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
Not Available   
0.84 kJ/Kg K   
15

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

Reserves

Deposits in Eastern Continents
  
  

Asia
India, Pakistan, Russia   
Bangladesh, Bhutan, China, India, North Korea, Qatar, Russia, Saudi Arabia, South Korea, Thailand   

Africa
Ethiopia, Kenya, Morocco, South Africa   
Cameroon, East Africa, Tanzania, Western Africa   

Europe
Austria, France, Germany, Greece, Italy, Romania, Scotland, Spain, Switzerland   
United Kingdom   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
USA   
Canada, USA   

South America
Colombia, Ecuador, Peru   
Bolivia, Brazil, Colombia, Ecuador   

Deposits in Oceania Continent
  
  

Australia
New South Wales, Victoria, Western Australia   
New South Wales, New Zealand, Queensland, Western Australia   

Summary >>
<< Reserves

All about Marl and Hornfels Properties

Know all about Marl and Hornfels properties here. All properties of rocks are important as they define the type of rock and its application. Marl belongs to Sedimentary Rocks while Hornfels belongs to Metamorphic Rocks.Texture of Marl is Earthy whereas that of Hornfels is Granular, Platy. Marl appears Rough and Dull and Hornfels appears Dull. The luster of Marl is dull while that of Hornfels is shiny. Marl is available in beige, brown, green, grey, white colors whereas Hornfels is available in brown, dark greenish - grey, green, reddish brown colors. The commercial uses of Marl are creating artwork, soil conditioner and that of Hornfels are cemetery markers, commemorative tablets, creating artwork.

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