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Essexite 
Essexite 

Hornfels
Hornfels



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Essexite  vs Hornfels

1 Definition
1.1 Definition
Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock
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
1.2 History
1.2.1 Origin
USA
New Zealand
1.2.2 Discoverer
Unknown
Unknown
1.3 Etymology
From the locality in Essex County, Massachusetts,US
From German which means hornstone
1.4 Class
Igneous Rocks
Metamorphic Rocks
1.4.1 Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
1.5 Family
1.5.1 Group
Plutonic
Not Applicable
1.6 Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock
2 Texture
2.1 Texture
Granular
Granular, Platy
2.2 Color
Dark Grey to Black
Brown, Dark Greenish - Grey, Green, Reddish Brown
2.3 Maintenance
Less
Less
2.4 Durability
Durable
Durable
2.4.1 Water Resistant
81% Igneous Rocks Rocks have it !
81% Metamorphic Rocks Rocks have it !
2.4.2 Scratch Resistant
86% Igneous Rocks Rocks have it !
65% Metamorphic Rocks Rocks have it !
2.4.3 Stain Resistant
66% Igneous Rocks Rocks have it !
42% Metamorphic Rocks Rocks have it !
2.4.4 Wind Resistant
49% Igneous Rocks Rocks have it !
19% Metamorphic Rocks Rocks have it !
2.4.5 Acid Resistant
48% Igneous Rocks Rocks have it !
15% Metamorphic Rocks Rocks have it !
2.5 Appearance
Banded
Dull
3 Uses
3.1 Architecture
3.1.1 Interior Uses
Decorative Aggregates, Homes, Interior Decoration
Decorative Aggregates, Flooring, Homes, Interior Decoration
3.1.2 Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
3.1.3 Other Architectural Uses
Curbing
Curbing
3.2 Industry
3.2.1 Construction Industry
As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate
for Road Aggregate, Roadstone
3.2.2 Medical Industry
Not Yet Used
Not Yet Used
3.3 Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines
Artifacts, Monuments
3.4 Other Uses
3.4.1 Commercial Uses
Cemetery Markers, Commemorative Tablets, Jewelry, Sea Defence, Tombstones
Cemetery Markers, Commemorative Tablets, Creating Artwork
4 Types
4.1 Types
Not Available
Biotite hornfels
4.2 Features
Is one of the oldest rock, Smooth to touch
Smooth to touch
4.3 Archaeological Significance
4.3.1 Monuments
Used
Used
4.3.2 Famous Monuments
Data Not Available
Data Not Available
4.3.3 Sculpture
Used
Not Yet Used
4.3.4 Famous Sculptures
Data Not Available
Not Applicable
4.3.5 Pictographs
Not Used
Used
4.3.6 Petroglyphs
Not Used
Used
4.3.7 Figurines
Used
Not Yet Used
4.4 Fossils
Absent
Absent
5 Formation
5.1 Formation
Essexite is a type of igneous rock, which is usually dark grey to black plutonic rock. For the formation of essexite, suitable magma with exact composition of K, Ba, Rb, Cs, Sr should be produced.
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.
5.2 Composition
5.2.1 Mineral Content
Augite, Feldspar, Hornblende, Nepheline, Olivine, Plagioclase, Pyroxene
Andalusite
5.2.2 Compound Content
Aluminium Oxide, Ba, Ca, Cs, Potassium, Rb, Sodium, Sr
Fe, Mg
5.3 Transformation
5.3.1 Metamorphism
97% Igneous Rocks Rocks have it !
50% Metamorphic Rocks Rocks have it !
5.3.2 Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism
Not Applicable
5.3.3 Weathering
99% Igneous Rocks Rocks have it !
65% Metamorphic Rocks Rocks have it !
5.3.4 Types of Weathering
Biological Weathering, Chemical Weathering
Biological Weathering
5.3.5 Erosion
92% Igneous Rocks Rocks have it !
77% Metamorphic Rocks Rocks have it !
5.3.6 Types of Erosion
Coastal Erosion, Glacier Erosion, Water Erosion
Chemical Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion
6 Properties
6.1 Physical Properties
6.1.1 Hardness
7
2-3
6.1.2 Grain Size
Fine Grained
Fine Grained
6.1.3 Fracture
Conchoidal
Conchoidal
6.1.4 Streak
Black
Unknown
6.1.5 Porosity
Highly Porous
Highly Porous
6.1.6 Luster
Not Available
Shiny
6.1.7 Compressive Strength
Flint
Not Available
Rank: N/A (Overall)
5.80 N/mm2
Rank: 31 (Overall)
Obsidian
ADD ⊕
6.1.8 Cleavage
Not Available
Perfect
6.1.9 Toughness
1.6
Not Yet Found
6.1.10 Specific Gravity
Not Available
3.4-3.9
6.1.11 Transparency
Opaque
Opaque
6.1.12 Density
Not Available
0.25-0.30 g/cm3
6.2 Thermal Properties
6.2.1 Specific Heat Capacity
Banded iron for..
Not Available
Rank: N/A (Overall)
0.84 kJ/Kg K
Rank: 15 (Overall)
Granulite
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6.2.2 Resistance
Impact Resistant, Pressure Resistant, Wear Resistant
Heat Resistant, Impact Resistant, Pressure Resistant
7 Reserves
7.1 Deposits in Eastern Continents
7.1.1 Asia
India, Russia
Bangladesh, Bhutan, China, India, North Korea, Qatar, Russia, Saudi Arabia, South Korea, Thailand
7.1.2 Africa
South Africa
Cameroon, East Africa, Tanzania, Western Africa
7.1.3 Europe
Germany, Greece, Italy, Scotland, Turkey
United Kingdom
7.1.4 Others
Greenland
Not Yet Found
7.2 Deposits in Western Continents
7.2.1 North America
Canada, USA
Canada, USA
7.2.2 South America
Brazil, Colombia, Venezuela
Bolivia, Brazil, Colombia, Ecuador
7.3 Deposits in Oceania Continent
7.3.1 Australia
New Zealand, Queensland
New South Wales, New Zealand, Queensland, Western Australia

Essexite  vs Hornfels Information

Earth’s outer layer is covered by rocks and these rocks have different physical and chemical properties. As two rocks are not same, it’s fun to compare them. You can also know more about Essexite  and Hornfels Reserves. Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock. 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. These rocks are composed of many distinct minerals. The process of formation of rocks is different for various rocks. Rocks are quarried from many years for various purposes. You can check out Essexite  vs Hornfels information and Essexite  vs Hornfels characteristics in the upcoming sections.

Essexite  vs Hornfels Characteristics

Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Essexite  vs Hornfels characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Essexite  and Properties of Hornfels. Learn more about Essexite  vs Hornfels in the next section. The interior uses of Essexite  include Decorative aggregates, Homes and Interior decoration whereas the interior uses of Hornfels include Decorative aggregates, Flooring, Homes and Interior decoration. Due to some exceptional properties of Essexite  and Hornfels, they have various applications in construction industry. The uses of Essexite  in construction industry include As dimension stone, Building houses or walls, Cement manufacture, Construction aggregate, For road aggregate and that of Hornfels include For road aggregate, Roadstone.

More about Essexite  and Hornfels

Here you can know more about Essexite  and Hornfels. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Essexite  and Hornfels consists of mineral content and compound content. The mineral content of Essexite  includes Augite, Feldspar, Hornblende, Nepheline, Olivine, Plagioclase, Pyroxene and mineral content of Hornfels includes Andalusite. You can also check out the list of all Igneous Rocks. When we have to compare Essexite  vs Hornfels, the texture, color and appearance plays an important role in determining the type of rock. Essexite  is available in dark grey to black colors whereas, Hornfels is available in brown, dark greenish - grey, green, reddish brown colors. Appearance of Essexite  is Banded and that of Hornfels is Dull. Properties of rock is another aspect for Essexite  vs Hornfels. The hardness of Essexite  is 7 and that of Hornfels is 2-3. The types of Essexite  are Not Available whereas types of Hornfels are Biotite hornfels. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Essexite  is black while that of Hornfels is unknown. The specific heat capacity of Essexite  is Not Available and that of Hornfels is 0.84 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Essexite  is impact resistant, pressure resistant, wear resistant whereas Hornfels is heat resistant, impact resistant, pressure resistant.