Essexite

Websterite

Essexite and Websterite

Essexite

Websterite

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Definition

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

Websterite is ultramafic and ultrabasic rock that consists of roughly equal proportions of orthopyroxene and clinopyroxene. It is a special type of pyroxenite.

History

Origin

USA

Webster, North Carolina

Discoverer

Unknown

Etymology

From the locality in Essex County, Massachusetts,US

From the town of Webster located in North Carolina

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Plutonic

Other Categories

Fine Grained Rock, Opaque Rock

Coarse Grained Rock, Opaque Rock

Texture

Granular

Clastic, Granular, Phaneritic, Porphyritic

Color

Dark Grey to Black

Black to Grey, Bluish - Grey, Dark Greenish - Grey, Green, Light Greenish Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Banded

Layered, Banded, Veined and Shiny

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes, Interior Decoration

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

Exterior Uses

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

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

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts

Other Uses

Commercial Uses

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

Cemetery Markers, Commemorative Tablets, Creating Artwork, Laboratory bench tops, Jewelry, Sea Defence, Tombstones

Types

Intermediate volcanic rock

Ultramafic rock

Features

Is one of the oldest rock, Smooth to touch

Generally rough to touch, Is one of the oldest rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

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.

Websterite can be formed as cumulates in ultramafic intrusions by accumulation of pyroxene crystals at the base of the lava chamber.

Composition

Mineral Content

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

Amphibole, Augite, Bronzite, Chromite, Diopside, Enstatite, Garnet, Hornblende, Hypersthene, Magnetite, Pyroxene

Compound Content

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

Aluminium Oxide, CaO, Chromium(III) Oxide, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Sulfur Trioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

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

Burial Metamorphism, Impact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion, Glacier Erosion, Water Erosion

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

Properties

Physical Properties

Hardness

1 7

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Grain Size

Fine Grained

Coarse Grained

Fracture

Conchoidal

Uneven

Streak

Black

White, Greenish White or Grey

Porosity

Highly Porous

Less Porous

Luster

Dull to Vitreous to Submetallic

Compressive Strength

120.00 N/mm²95.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

1.6

Specific Gravity

-99993.2-3.5

0 8.4

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Transparency

Opaque

Density

-9999 g/cm³3.1-3.6 g/cm³

0 1400

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Thermal Properties

Specific Heat Capacity

0.79 kJ/Kg K0.79 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Impact Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia

Africa

South Africa

Europe

Germany, Greece, Italy, Scotland, Turkey

Others

Greenland

Deposits in Western Continents

North America

Canada, USA

South America

Brazil, Colombia, Venezuela

Deposits in Oceania Continent

Australia

New Zealand, Queensland

All about Essexite and Websterite Properties

Know all about Essexite and Websterite properties here. All properties of rocks are important as they define the type of rock and its application. Essexite and Websterite belong to Igneous Rocks.Texture of Essexite is Granular whereas that of Websterite is Clastic, Granular, Phaneritic, Porphyritic. Essexite appears Banded and Websterite appears Layered, Banded, Veined and Shiny. The luster of Essexite is while that of Websterite is dull to vitreous to submetallic. Essexite is available in dark grey to black colors whereas Websterite is available in black to grey, bluish - grey, dark greenish - grey, green, light greenish grey colors. The commercial uses of Essexite are cemetery markers, commemorative tablets, jewelry, sea defence, tombstones and that of Websterite are cemetery markers, commemorative tablets, creating artwork, laboratory bench tops, jewelry, sea defence, tombstones.