Definition
Harzburgite is a plutonic rock of the peridotite group consisting largely of orthopyroxene and olivine
Adakite is an intermediate to felsic volcanic rock that has geochemical characteristics of magma which is said to be formed by partial melting of altered basalt that is subducted below volcanic arcs
Origin
Germany
Adak, Aleutian Islands
Discoverer
Unknown
Defant and Drummond
Etymology
From the name of a town in Harzburg, Germany
From Adak, Aleutian Islands
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock
Texture
Phaneritic
Porphyritic
Color
Dark Greenish - Grey
Black, Brown, Light to Dark Grey
Durability
Durable
Durable
Appearance
Rough and Shiny
Dull and Soft
Interior Uses
Decorative Aggregates, Homes, Interior Decoration
Decorative Aggregates, Floor Tiles, Homes, Hotels, Kitchens
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
As Building Stone, As Facing Stone, Office Buildings
Other Architectural Uses
Curbing
Whetstones
Construction Industry
As Dimension Stone, Cobblestones
As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone
Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines
Monuments, Sculpture, Small Figurines
Commercial Uses
Creating Artwork, Gemstone, Jewelry, Source of Chromite, Platinum, Nickel and Garnet, Source of Diamonds
Commemorative Tablets, Pottery, Used in aquariums
Types
Ultramafic rock
Intermediate volcanic rock
Features
Constitutes upper part of the Earth's mantle, Generally rough to touch, Is one of the oldest rock
Has High structural resistance against erosion and climate, Host rock for Diamond, Very fine grained rock
Archaeological Significance
Formation
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.
Adakite rocks are formed when the hydrous fluids are released from minerals that break down in metamorphosed basalt, and rise into the mantle they initiate partial melting.
Mineral Content
Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene
Olivine, Plagioclase, Pyroxene
Compound Content
Ca, Fe, Mg, Potassium, Silicon Dioxide, Sodium, Titanium Dioxide
Aluminium Oxide, MgO, Silicon Dioxide
Types of Metamorphism
Impact Metamorphism
Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism
Types of Weathering
Chemical Weathering, Mechanical Weathering
Chemical Weathering, Mechanical Weathering
Types of Erosion
Chemical Erosion, Sea Erosion
Coastal Erosion, Sea Erosion, Water Erosion
Grain Size
Coarse Grained
Fine to Medium Grained
Fracture
Irregular
Conchoidal
Streak
White
Bluish Black
Porosity
Less Porous
Less Porous
Luster
Shiny
Grainy, Pearly and Vitreous
Specific Gravity
3-3.01
-9999
Transparency
Translucent to Opaque
Opaque
Density
3.1-3.4 g/cm3
-9999 g/cm3
Resistance
Heat Resistant, Pressure Resistant, Wear Resistant
Heat Resistant, Pressure Resistant, Wear Resistant
Deposits in Eastern Continents
Asia
Japan, Oman
India, Russia
Africa
South Africa
Ethiopia, Somalia, South Africa
Europe
France, Germany, Italy
Iceland
Others
Hawaii Islands, Mid-Atlantic Ridge
-
Deposits in Western Continents
North America
Canada, USA
Canada, USA
Deposits in Oceania Continent
Harzburgite vs Adakite 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. Harzburgite vs Adakite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Harzburgite and Properties of Adakite. Learn more about Harzburgite vs Adakite in the next section. The interior uses of Harzburgite include Decorative aggregates, Homes and Interior decoration whereas the interior uses of Adakite include Decorative aggregates, Floor tiles, Homes, Hotels and Kitchens. Due to some exceptional properties of Harzburgite and Adakite, they have various applications in construction industry. The uses of Harzburgite in construction industry include As dimension stone, Cobblestones and that of Adakite include As dimension stone, Cobblestones, Rail track ballast, Roadstone.
More about Harzburgite and Adakite
Here you can know more about Harzburgite and Adakite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Harzburgite and Adakite consists of mineral content and compound content. The mineral content of Harzburgite includes Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene and mineral content of Adakite includes Olivine, Plagioclase, Pyroxene. You can also check out the list of all Igneous Rocks. When we have to compare Harzburgite vs Adakite, the texture, color and appearance plays an important role in determining the type of rock. Harzburgite is available in dark greenish - grey colors whereas, Adakite is available in black, brown, light to dark grey colors. Appearance of Harzburgite is Rough and Shiny and that of Adakite is Dull and Soft. Properties of rock is another aspect for Harzburgite vs Adakite. The hardness of Harzburgite is 5.5-6 and that of Adakite is 3-4. The types of Harzburgite are Ultramafic rock whereas types of Adakite are Intermediate volcanic rock. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Harzburgite is white while that of Adakite is bluish black. The specific heat capacity of Harzburgite is 1.25 kJ/Kg K and that of Adakite 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.Harzburgite is heat resistant, pressure resistant, wear resistant whereas Adakite is heat resistant, pressure resistant, wear resistant.