Essexite and Harzburgite
Definition
Definition
Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock
Harzburgite is a plutonic rock of the peridotite group consisting largely of orthopyroxene and olivine
History
Origin
USA
Germany
Discoverer
Unknown
Unknown
Etymology
From the locality in Essex County, Massachusetts,US
From the name of a town in Harzburg, Germany
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Plutonic
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock
Texture
Texture
Granular
Phaneritic
Color
Dark Grey to Black
Dark Greenish - Grey
Maintenance
Less
Less
Durability
Durable
Durable
Water Resistant
Yes
Yes
Scratch Resistant
Yes
Yes
Stain Resistant
Yes
Yes
Wind Resistant
Yes
Yes
Acid Resistant
No
No
Appearance
Banded
Rough and Shiny
Uses
Architecture
Interior Uses
Decorative Aggregates, Homes, Interior Decoration
Decorative Aggregates, Homes, Interior Decoration
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
Other Architectural Uses
Curbing
Curbing
Industry
Construction Industry
As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate
As Dimension Stone, Cobblestones
Medical Industry
Not Yet Used
Not Yet Used
Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines
Artifacts, Monuments, Sculpture, Small Figurines
Other Uses
Commercial Uses
Cemetery Markers, Commemorative Tablets, Jewelry, Sea Defence, Tombstones
Creating Artwork, Gemstone, Jewelry, Source of Chromite, Platinum, Nickel and Garnet, Source of Diamonds
Types
Types
Not Available
Not Available
Features
Is one of the oldest rock, Smooth to touch
Constitutes upper part of the Earth's mantle, Generally rough to touch, Is one of the oldest rock
Archaeological Significance
Monuments
Used
Used
Famous Monuments
Data Not Available
Data Not Available
Sculpture
Used
Used
Famous Sculptures
Data Not Available
Data Not Available
Pictographs
Not Used
Used
Petroglyphs
Not Used
Used
Figurines
Used
Used
Fossils
Absent
Absent
Formation
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.
Harzburgite 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.
Composition
Mineral Content
Augite, Feldspar, Hornblende, Nepheline, Olivine, Plagioclase, Pyroxene
Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene
Compound Content
Aluminium Oxide, Ba, Ca, Cs, Potassium, Rb, Sodium, Sr
Ca, Fe, Mg, Potassium, Silicon Dioxide, Sodium, Titanium Dioxide
Transformation
Metamorphism
Yes
Yes
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism
Impact Metamorphism
Weathering
Yes
Yes
Types of Weathering
Biological Weathering, Chemical Weathering
Chemical Weathering, Mechanical Weathering
Erosion
Yes
Yes
Types of Erosion
Coastal Erosion, Glacier Erosion, Water Erosion
Chemical Erosion, Sea Erosion
Properties
Physical Properties
Hardness
7
5.5-6
Grain Size
Fine Grained
Coarse Grained
Fracture
Conchoidal
Irregular
Streak
Black
White
Porosity
Highly Porous
Less Porous
Luster
Not Available
Shiny
Cleavage
Not Available
Imperfect
Toughness
1.6
2.1
Specific Gravity
Not Available
3-3.01
Transparency
Opaque
Translucent to Opaque
Density
Not Available
3.1-3.4 g/cm3
Thermal Properties
Specific Heat Capacity
Not Available
1.25 kJ/Kg K
6
Resistance
Impact Resistant, Pressure Resistant, Wear Resistant
Heat Resistant, Pressure Resistant, Wear Resistant
Reserves
Deposits in Eastern Continents
Asia
India, Russia
Japan, Oman
Africa
South Africa
South Africa
Europe
Germany, Greece, Italy, Scotland, Turkey
France, Germany, Italy, Venezuela
Others
Greenland
Hawaii Islands, Mid-Atlantic Ridge
Deposits in Western Continents
North America
Canada, USA
Canada, USA
South America
Brazil, Colombia, Venezuela
Not Yet Found
Deposits in Oceania Continent
Australia
New Zealand, Queensland
Not Yet Found
All about Essexite and Harzburgite Properties
Know all about Essexite and Harzburgite properties here. All properties of rocks are important as they define the type of rock and its application. Essexite and Harzburgite belong to Igneous Rocks.Texture of Essexite is Granular whereas that of Harzburgite is Phaneritic. Essexite appears Banded and Harzburgite appears Rough and Shiny. The luster of Essexite is not available while that of Harzburgite is shiny. Essexite is available in dark grey to black colors whereas Harzburgite is available in dark greenish - grey colors. The commercial uses of Essexite are cemetery markers, commemorative tablets, jewelry, sea defence, tombstones and that of Harzburgite are creating artwork, gemstone, jewelry, source of chromite, platinum, nickel and garnet, source of diamonds.
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