Definition
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
  
Mylonite is a metamorphic rock formed by ductile deformation during intense shearing encountered during folding and faulting, a process termed cataclastic or dynamic metamorphism
  
History
  
  
Origin
Hawaii Islands
  
New Zealand
  
Discoverer
Unknown
  
Unknown
  
Etymology
From Greek pikros bitter + -ite, 19th century
  
From Greek mulōn mill + -ite
  
Class
Igneous Rocks
  
Metamorphic Rocks
  
Sub-Class
Durable Rock, Hard Rock
  
Durable Rock, Medium Hardness Rock
  
Family
  
  
Group
Volcanic
  
Not Applicable
  
Other Categories
Fine Grained Rock, Opaque Rock
  
Fine Grained Rock, Opaque Rock
  
Texture
Earthy, Rough
  
Foliated
  
Color
Black, Brown, Colourless, Green, Grey, Pink, White, Yellow
  
Black to Grey
  
Maintenance
Less
  
Less
  
Durability
Durable
  
Durable
  
Water Resistant
Yes
  
Yes
  
Scratch Resistant
Yes
  
Yes
  
Stain Resistant
Yes
  
No
  
Wind Resistant
Yes
  
No
  
Acid Resistant
Yes
  
No
  
Appearance
Rough and Shiny
  
Dull, Banded and Foilated
  
Architecture
  
  
Interior Uses
Countertops, Decorative Aggregates, Homes, Interior Decoration
  
Decorative Aggregates, Interior Decoration
  
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
  
As Building Stone, As Facing Stone, Paving Stone, Garden Decoration
  
Other Architectural Uses
Curbing
  
Curbing
  
Industry
  
  
Construction Industry
As a Sintering Agent in Steel Industry to process Iron Ore, Cement Manufacture, for Road Aggregate, Manufacture of Magnesium and Dolomite Refractories, Roadstone, Used for flooring, stair treads, borders and window sills.
  
for Road Aggregate, Landscaping, Roadstone
  
Medical Industry
Not Yet Used
  
Not Yet Used
  
Antiquity Uses
Artifacts, Monuments, Sculpture
  
Artifacts, Monuments
  
Other Uses
  
  
Commercial Uses
As a Feed Additive for Livestock, As armour rock for sea walls, Metallurgical Flux, Pottery, Source of Magnesia (MgO)
  
Creating Artwork, Gemstone, Jewelry
  
Types
Oceanite
  
Blastomylonites, Ultramylonites and Phyllonites
  
Features
Host Rock for Lead
  
Surfaces are often shiny
  
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
Picrite 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.
  
Mylonites are ductilely deformed rocks formed by the accumulation of large shear strain, in ductile fault zones.
  
Composition
  
  
Mineral Content
Biotite, Olivine, Plagioclase, Pyrrhotite
  
Porphyroblasts
  
Compound Content
Al, CaO, Carbon Dioxide, Mg, MgO
  
Aluminium Oxide, Calcium Sulfate, Chromium(III) Oxide, Iron(III) Oxide, Magnesium Carbonate, Silicon Dioxide
  
Transformation
  
  
Metamorphism
Yes
  
No
  
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Impact Metamorphism, Regional Metamorphism
  
Not Applicable
  
Weathering
Yes
  
Yes
  
Types of Weathering
Biological Weathering
  
Biological Weathering, Chemical Weathering, Mechanical Weathering
  
Erosion
Yes
  
Yes
  
Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion
  
Chemical Erosion, Sea Erosion, Wind Erosion
  
Physical Properties
  
  
Hardness
6.8
  
3-4
  
Grain Size
Fine Grained
  
Fine Grained
  
Fracture
Uneven
  
Conchoidal
  
Streak
White, Greenish White or Grey
  
White
  
Porosity
Less Porous
  
Highly Porous
  
Luster
Subvitreous to Dull
  
Shiny
  
Compressive Strength
189.00 N/mm2
  
11
Cleavage
Imperfect
  
Conchoidal
  
Toughness
2.1
  
Not Available
  
Specific Gravity
2.75-2.92
  
2.97-3.05
  
Transparency
Opaque
  
Opaque
  
Density
1.5-2.5 g/cm3
  
2.6-4.8 g/cm3
  
Thermal Properties
  
  
Specific Heat Capacity
0.88 kJ/Kg K
  
13
1.50 kJ/Kg K
  
3
Resistance
Heat Resistant
  
Heat Resistant, Impact Resistant, Pressure Resistant
  
Deposits in Eastern Continents
  
  
Asia
India, Russia
  
China, India, Indonesia, Saudi Arabia, South Korea
  
Africa
South Africa
  
Eritrea, Ethiopia, Ghana, South Africa, Western Africa
  
Europe
Iceland
  
England, Finland, France, Germany, Great Britain, Greece, United Kingdom
  
Others
Not Yet Found
  
Not Yet Found
  
Deposits in Western Continents
  
  
North America
Canada, USA
  
USA
  
South America
Brazil
  
Not Yet Found
  
Deposits in Oceania Continent
  
  
Australia
Not Yet Found
  
Central Australia, Western Australia
  
Picrite vs Mylonite 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. Picrite vs Mylonite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Picrite and Properties of Mylonite. Learn more about Picrite vs Mylonite in the next section. The interior uses of Picrite include Countertops, Decorative aggregates, Homes and Interior decoration whereas the interior uses of Mylonite include Decorative aggregates and Interior decoration. Due to some exceptional properties of Picrite and Mylonite, they have various applications in construction industry. The uses of Picrite in construction industry include As a sintering agent in steel industry to process iron ore, Cement manufacture, For road aggregate, Manufacture of magnesium and dolomite refractories, Roadstone, Used for flooring, stair treads, borders and window sills. and that of Mylonite include For road aggregate, Landscaping, Roadstone.
More about Picrite and Mylonite
Here you can know more about Picrite and Mylonite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Picrite and Mylonite consists of mineral content and compound content. The mineral content of Picrite includes Biotite, Olivine, Plagioclase, Pyrrhotite and mineral content of Mylonite includes Porphyroblasts. You can also check out the list of all Igneous Rocks. When we have to compare Picrite vs Mylonite, the texture, color and appearance plays an important role in determining the type of rock. Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors whereas, Mylonite is available in black to grey colors. Appearance of Picrite is Rough and Shiny and that of Mylonite is Dull, Banded and Foilated. Properties of rock is another aspect for Picrite vs Mylonite. The hardness of Picrite is 6.8 and that of Mylonite is 3-4. The types of Picrite are Oceanite whereas types of Mylonite are Blastomylonites, Ultramylonites and Phyllonites. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Picrite and Mylonite is white, greenish white or grey. The specific heat capacity of Picrite is 0.88 kJ/Kg K and that of Mylonite is 1.50 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Picrite is heat resistant whereas Mylonite is heat resistant, impact resistant, pressure resistant.