Picrite

Essexite

Picrite and Essexite

Picrite

Essexite

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1 Definition

1.1 Definition

Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine

Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock

1.2 History

1.2.1 Origin

Hawaii Islands

USA

1.2.2 Discoverer

Unknown

1.3 Etymology

From Greek pikros bitter + -ite, 19th century

From the locality in Essex County, Massachusetts,US

1.4 Class

Igneous Rocks

1.4.1 Sub-Class

Durable Rock, Hard Rock

1.5 Family

1.5.1 Group

Volcanic

Plutonic

1.6 Other Categories

Fine Grained Rock, Opaque Rock

2 Texture

2.1 Texture

Earthy, Rough

Granular

2.2 Color

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

Dark Grey to Black

2.3 Maintenance

Less

2.4 Durability

Durable

2.4.1 Water Resistant

✔ ✘

2.4.2 Scratch Resistant

✔ ✘

2.4.3 Stain Resistant

✔ ✘

2.4.4 Wind Resistant

✔ ✘

2.4.5 Acid Resistant

✔ ✘

2.5 Appearance

Rough and Shiny

Banded

3 Uses

3.1 Architecture

3.1.1 Interior Uses

Countertops, Decorative Aggregates, Homes, Interior Decoration

Decorative Aggregates, Homes, Interior Decoration

3.1.2 Exterior Uses

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

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

3.1.3 Other Architectural Uses

Curbing

3.2 Industry

3.2.1 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, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate

3.2.2 Medical Industry

Not Yet Used

3.3 Antiquity Uses

Artifacts, Monuments, Sculpture

Artifacts, Monuments, Sculpture, Small Figurines

3.4 Other Uses

3.4.1 Commercial Uses

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

Cemetery Markers, Commemorative Tablets, Jewelry, Sea Defence, Tombstones

2 Types

2.1 Types

Oceanite

Not Available

2.2 Features

Host Rock for Lead

Is one of the oldest rock, Smooth to touch

2.3 Archaeological Significance

2.3.1 Monuments

Used

2.3.2 Famous Monuments

Data Not Available

2.3.3 Sculpture

Used

2.3.4 Famous Sculptures

Data Not Available

2.3.5 Pictographs

Not Used

2.3.6 Petroglyphs

Not Used

2.3.7 Figurines

Used

2.4 Fossils

Absent

3 Formation

3.1 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.

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.

3.2 Composition

3.2.1 Mineral Content

Biotite, Olivine, Plagioclase, Pyrrhotite

Augite, Feldspar, Hornblende, Nepheline, Olivine, Plagioclase, Pyroxene

3.2.2 Compound Content

Al, CaO, Carbon Dioxide, Mg, MgO

Aluminium Oxide, Ba, Ca, Cs, Potassium, Rb, Sodium, Sr

3.3 Transformation

3.3.1 Metamorphism

✔ ✘

3.3.2 Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Impact Metamorphism, Regional Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism

3.3.3 Weathering

✔ ✘

3.3.4 Types of Weathering

Biological Weathering

Biological Weathering, Chemical Weathering

3.3.5 Erosion

✔ ✘

3.3.6 Types of Erosion

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

Coastal Erosion, Glacier Erosion, Water Erosion

4 Properties

4.1 Physical Properties

4.1.1 Hardness

6.87

1 7

4.1.8 Grain Size

Fine Grained

4.1.9 Fracture

Uneven

Conchoidal

4.1.10 Streak

White, Greenish White or Grey

Black

4.1.11 Porosity

Less Porous

Highly Porous

4.1.12 Luster

Subvitreous to Dull

Not Available

4.1.13 Compressive Strength

189.00 N/mm²NA

0.15 450

4.1.14 Cleavage

Imperfect

Not Available

4.1.15 Toughness

2.1

1.6

4.1.16 Specific Gravity

2.75-2.92Not Available

0 8.4

4.1.20 Transparency

Opaque

4.1.21 Density

1.5-2.5 g/cm³Not Available

0 1400

4.2 Thermal Properties

4.2.1 Specific Heat Capacity

0.88 kJ/Kg KNA

0.14 3.2

4.3.2 Resistance

Heat Resistant

Impact Resistant, Pressure Resistant, Wear Resistant

5 Reserves

5.1 Deposits in Eastern Continents

5.1.1 Asia

India, Russia

5.1.2 Africa

South Africa

5.1.3 Europe

Iceland

Germany, Greece, Italy, Scotland, Turkey

5.1.4 Others

Not Yet Found

Greenland

5.2 Deposits in Western Continents

5.2.1 North America

Canada, USA

5.2.2 South America

Brazil

Brazil, Colombia, Venezuela

5.3 Deposits in Oceania Continent

5.3.1 Australia

Not Yet Found

New Zealand, Queensland

All about Picrite and Essexite Properties

Know all about Picrite and Essexite properties here. All properties of rocks are important as they define the type of rock and its application. Picrite and Essexite belong to Igneous Rocks.Texture of Picrite is Earthy, Rough whereas that of Essexite is Granular. Picrite appears Rough and Shiny and Essexite appears Banded. The luster of Picrite is subvitreous to dull while that of Essexite is not available. Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors whereas Essexite is available in dark grey to black colors. The commercial uses of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo) and that of Essexite are cemetery markers, commemorative tablets, jewelry, sea defence, tombstones.