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Picrite
Picrite

Gneiss
Gneiss



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Picrite vs Gneiss

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Definition

Definition

Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks

History

Origin

Hawaii Islands
-

Discoverer

Unknown
Unknown

Etymology

From Greek pikros bitter + -ite, 19th century
From the Middle High German verb gneist (to spark; so called because the rock glitters)

Class

Igneous Rocks
Metamorphic Rocks

Sub-Class

Durable Rock, Hard Rock
Durable Rock, Hard Rock

Family

Group

Volcanic
-

Other Categories

Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Texture

Earthy, Rough
Banded, Foliated, Platy

Color

Black, Brown, Green, Grey, Pink, White, Yellow
Black, Brown, Pink, Red, White

Maintenance

Less
More

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Rough and Shiny
Foliated

Uses

Architecture

Interior Uses

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

Exterior Uses

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

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.
As Dimension Stone

Medical Industry

-
-

Antiquity Uses

Artifacts, Monuments, Sculpture
Artifacts

Other Uses

Commercial Uses

As a Feed Additive for Livestock, As armour rock for sea walls, Metallurgical Flux, Pottery, Source of Magnesia (MgO)
Cemetery Markers, Jewelry, Tombstones, Used in aquariums

Types

Types

Oceanite
Augen Gneiss, Henderson Gneiss, Lewisian Gneiss, Archean and Proterozoic Gneiss.

Features

Host Rock for Lead
Generally rough to touch, Is one of the oldest rock

Archaeological Significance

Monuments

-
-

Famous Monuments

-
Konark Sun Temple in India, Washington Monument, US

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Absent

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.
Gneiss is a high grade metamorphic rock i.e. it has been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of Gneiss forms from volcanic rock, shale or granitie.

Composition

Mineral Content

Biotite, Olivine, Plagioclase, Pyrrhotite
Biotite, Chlorite, Feldspar, Garnet, Graphite, Hornblade, Micas, Muscovite or Illite, Quartz, Quartzite, Silica, Zircon

Compound Content

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

Transformation

Metamorphism

Types of Metamorphism

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

Weathering

Types of Weathering

Biological Weathering
Biological Weathering, Mechanical Weathering

Erosion

Types of Erosion

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

Properties

Physical Properties

Hardness

6.87
1 7
👆🏻

Grain Size

Fine Grained
Medium to Coarse Grained

Fracture

Uneven
Irregular

Streak

White, Greenish White or Grey
White

Porosity

Less Porous
Very Less Porous

Luster

Subvitreous to Dull
Dull

Compressive Strength

189.00 N/mm2125.00 N/mm2
0.15 450
👆🏻

Cleavage

-
-

Toughness

2.1
1.2

Specific Gravity

2.75-2.922.5-2.7
0 8.4
👆🏻

Transparency

Opaque
Translucent to Opaque

Density

1.5-2.5 g/cm32.6-2.9 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

0.88 kJ/Kg K0.70 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant
Heat Resistant, Pressure Resistant, Scratch Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia
China, India, Iran, Iraq, Kazakhstan, Kyrgyzstan, Mongolia, Russia

Africa

South Africa
Cameroon, Ethiopia, Ghana, Kenya, Madagascar, Morocco, Mozambique, Namibia, Nigeria, Tanzania, Togo

Europe

Iceland
Albania, Austria, Bosnia and Herzegovina, Finland, France, Georgia, Germany, Hungary, Italy, Kosovo, Monaco, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, Switzerland, Ukraine, United Kingdom

Others

-
-

Deposits in Western Continents

North America

Canada, USA
Canada, Costa Rica, Cuba, Mexico, Panama, USA

South America

Brazil
Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Peru, Venezuela

Deposits in Oceania Continent

Australia

-
New South Wales, New Zealand, Queensland, Victoria

Picrite vs Gneiss 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 Gneiss Reserves. Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine. Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. 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 Gneiss information and Picrite vs Gneiss characteristics in the upcoming sections.

Picrite vs Gneiss 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 Gneiss characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Picrite and Properties of Gneiss. Learn more about Picrite vs Gneiss in the next section. The interior uses of Picrite include Countertops, Decorative aggregates, Homes and Interior decoration whereas the interior uses of Gneiss include Countertops, Decorative aggregates, Flooring and Interior decoration. Due to some exceptional properties of Picrite and Gneiss, 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 Gneiss include As dimension stone.

More about Picrite and Gneiss

Here you can know more about Picrite and Gneiss. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Picrite and Gneiss consists of mineral content and compound content. The mineral content of Picrite includes Biotite, Olivine, Plagioclase, Pyrrhotite and mineral content of Gneiss includes Biotite, Chlorite, Feldspar, Garnet, Graphite, Hornblade, Micas, Muscovite or Illite, Quartz, Quartzite, Silica, Zircon. You can also check out the list of all Igneous Rocks. When we have to compare Picrite vs Gneiss, 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, Gneiss is available in black, brown, pink, red, white colors. Appearance of Picrite is Rough and Shiny and that of Gneiss is Foliated. Properties of rock is another aspect for Picrite vs Gneiss. The hardness of Picrite is 6.8 and that of Gneiss is 7. The types of Picrite are Oceanite whereas types of Gneiss are Augen Gneiss, Henderson Gneiss, Lewisian Gneiss, Archean and Proterozoic Gneiss.. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Picrite and Gneiss is white, greenish white or grey. The specific heat capacity of Picrite is 0.88 kJ/Kg K and that of Gneiss is 0.70 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 Gneiss is heat resistant, pressure resistant, scratch resistant, wear resistant.