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Picrite
Picrite

Greywacke
Greywacke



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Picrite vs Greywacke

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Definition

Definition

Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
Greywacke is defined as a dark coarse-grained sandstone rock which contains more than 15 per cent clay

History

Origin

Hawaii Islands
-

Discoverer

Unknown
Unknown

Etymology

From Greek pikros bitter + -ite, 19th century
From German Grauwacke, from grau grey + wacke

Class

Igneous Rocks
Sedimentary Rocks

Sub-Class

Durable Rock, Hard Rock
Durable Rock, Hard Rock

Family

Group

Volcanic
-

Other Categories

Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock

Texture

Texture

Earthy, Rough
Clastic

Color

Black, Brown, Green, Grey, Pink, White, Yellow
Beige, Black, Brown, Cream, Dark Brown, Green, Grey, Light Green, Light to Dark Grey, Pink, Red, White, Yellow

Maintenance

Less
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Rough and Shiny
Dull

Uses

Architecture

Interior Uses

Countertops, Decorative Aggregates, Homes, Interior Decoration
Decorative Aggregates, Floor Tiles, Flooring, Homes, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone

Other Architectural Uses

Curbing
Curbing, Whetstones

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.
Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Raw material for the manufacture of mortar

Medical Industry

-
-

Antiquity Uses

Artifacts, Monuments, Sculpture
Artifacts, Sculpture, Small Figurines

Other Uses

Commercial Uses

As a Feed Additive for Livestock, As armour rock for sea walls, Metallurgical Flux, Pottery, Source of Magnesia (MgO)
As armour rock for sea walls, Petroleum reservoirs, Sea Defence, Tombstones

Types

Types

Oceanite
Greywacke

Features

Host Rock for Lead
Available in Lots of Colors and Patterns, Generally rough to touch, Non-vesicular, Veined

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Present

Formation

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.
Graywacke rock is a type of sedimentary rock, which is also known as immature sandstone, which is indurated, dark grey and consisting of poorly sorted angular to sub-angular, sand-sized grains.

Composition

Mineral Content

Biotite, Olivine, Plagioclase, Pyrrhotite
Augite, Biotite, Calcite, Chlorite, Clay, Clay Minerals, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyroxene, Quartz

Compound Content

Al, CaO, Carbon Dioxide, Mg, MgO
Aluminium Oxide, NaCl, CaO, Chromium(III) Oxide, Iron(III) Oxide, FeO, Potassium Oxide, Magnesium Carbonate, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide

Transformation

Metamorphism

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Impact Metamorphism, Regional Metamorphism
-

Weathering

Types of Weathering

Biological Weathering
Biological Weathering, Chemical Weathering

Erosion

Types of Erosion

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

Properties

Physical Properties

Hardness

6.86-7
1 7
👆🏻

Grain Size

Fine Grained
Angular and Fine

Fracture

Uneven
Conchoidal

Streak

White, Greenish White or Grey
White

Porosity

Less Porous
Highly Porous

Luster

Subvitreous to Dull
Dull

Compressive Strength

189.00 N/mm2120.00 N/mm2
0.15 450
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Cleavage

-
Perfect

Toughness

2.1
2.6

Specific Gravity

2.75-2.922.2-2.8
0 8.4
👆🏻

Transparency

Opaque
Opaque

Density

1.5-2.5 g/cm32.6-2.61 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

0.88 kJ/Kg K0.71 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant
Heat Resistant, Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia
China, India, Kazakhstan, Mongolia, Russia, Uzbekistan

Africa

South Africa
Namibia, Nigeria, South Africa

Europe

Iceland
Austria, Denmark, Germany, Great Britain, Netherlands, Norway, Poland, Sweden, Switzerland, United Kingdom

Others

-
Greenland

Deposits in Western Continents

North America

Canada, USA
Canada, USA

South America

Brazil
Brazil

Deposits in Oceania Continent

Australia

-
New South Wales, New Zealand

Picrite vs Greywacke 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 Picrite and Greywacke Reserves. Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine. Greywacke is defined as a dark coarse-grained sandstone rock which contains more than 15 per cent clay. 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 Picrite vs Greywacke information and Picrite vs Greywacke characteristics in the upcoming sections.

Picrite vs Greywacke 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 Greywacke characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Picrite and Properties of Greywacke. Learn more about Picrite vs Greywacke in the next section. The interior uses of Picrite include Countertops, Decorative aggregates, Homes and Interior decoration whereas the interior uses of Greywacke include Decorative aggregates, Floor tiles, Flooring, Homes and Interior decoration. Due to some exceptional properties of Picrite and Greywacke, 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 Greywacke include Building houses or walls, Cement manufacture, Construction aggregate, For road aggregate, Raw material for the manufacture of mortar.

More about Picrite and Greywacke

Here you can know more about Picrite and Greywacke. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Picrite and Greywacke consists of mineral content and compound content. The mineral content of Picrite includes Biotite, Olivine, Plagioclase, Pyrrhotite and mineral content of Greywacke includes Augite, Biotite, Calcite, Chlorite, Clay, Clay Minerals, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyroxene, Quartz. You can also check out the list of all Igneous Rocks. When we have to compare Picrite vs Greywacke, the texture, color and appearance plays an important role in determining the type of rock. Picrite is available in black, brown, green, grey, pink, white, yellow colors whereas, Greywacke is available in beige, black, brown, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors. Appearance of Picrite is Rough and Shiny and that of Greywacke is Dull. Properties of rock is another aspect for Picrite vs Greywacke. The hardness of Picrite is 6.8 and that of Greywacke is 6-7. The types of Picrite are Oceanite whereas types of Greywacke are Greywacke. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Picrite and Greywacke is white, greenish white or grey. The specific heat capacity of Picrite is 0.88 kJ/Kg K and that of Greywacke is 0.71 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 Greywacke is heat resistant, impact resistant, pressure resistant.