Websterite

Amphibolite

Websterite and Amphibolite

Websterite

Amphibolite

Add ⊕

Definition

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

Amphibolite can be defined as a granular metamorphic rock which mainly consist of hornblende and plagioclase

History

Origin

Webster, North Carolina

Discoverer

Unknown

Alexandre Brongniart

Etymology

From the town of Webster located in North Carolina

From Amphibole + -ite

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Plutonic

Other Categories

Coarse Grained Rock, Opaque Rock

Coarse Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Clastic, Granular, Phaneritic, Porphyritic

Banded, Foliated, Massive

Color

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

Black, Brown, Green, Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Layered, Banded, Veined and Shiny

Foliated

Uses

Architecture

Interior Uses

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

Countertops, Decorative Aggregates, Entryways, Floor Tiles, Flooring, Homes, Hotels, Kitchens

Exterior Uses

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

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

Other Architectural Uses

Curbing

Industry

Construction Industry

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

As Dimension Stone, Building houses or walls, Cobblestones, Construction Aggregate, for Road Aggregate, Landscaping, Production of Glass and Ceramics, Roadstone

Medical Industry

Antiquity Uses

Artifacts

Artifacts, Sculpture, Small Figurines

Other Uses

Commercial Uses

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

Cemetery Markers, Commemorative Tablets, Creating Artwork

Types

Ultramafic rock

Hornblendite

Features

Generally rough to touch, Is one of the oldest rock

Clasts are smooth to touch, Matrix variable, Surfaces are often shiny

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

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

Amphibolite is a coarse-grained metamorphic rock which forms by metamorphism of mafic igneous rocks like basalt and gabbro or from the metamorphism of clay-rich sedimentary rocks like marl or graywacke.

Composition

Mineral Content

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

Amphibole, Andalusite, Biotite, Calcite, Epidote, Garnet, Hornblade, Kyanite, Magnetite, Olivine, Plagioclase, Pyroxene, Staurolite, Wollastonite

Compound Content

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

Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Impact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

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

Chemical Erosion, Glacier Erosion, Sea Erosion, Wind Erosion

Properties

Physical Properties

Hardness

76-7

1 7

👆🏻

Grain Size

Coarse Grained

Medium to Coarse Grained

Fracture

Uneven

Irregular to Conchoidal

Streak

White, Greenish White or Grey

White to Grey

Porosity

Less Porous

Luster

Dull to Vitreous to Submetallic

Vitreous to Dull

Compressive Strength

95.00 N/mm²90.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

2.3

Specific Gravity

3.2-3.52.5

0 8.4

👆🏻

Transparency

Opaque

Density

3.1-3.6 g/cm³2.85-3.07 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.79 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia

Russia, Turkey

Africa

South Africa

Burundi, Djibouti, Eritrea, Ethiopia, Kenya, Madagascar, Rwanda, Somalia, South Africa, Sudan, Tanzania, Uganda

Europe

Germany, Greece, Italy, Scotland, Turkey

Germany, Greece, Iceland, Norway, Poland

Others

Greenland

Deposits in Western Continents

North America

Canada, USA

South America

Brazil, Colombia, Venezuela

Brazil

Deposits in Oceania Continent

Australia

New Zealand, Queensland

South Australia, Western Australia

All about Websterite and Amphibolite Properties

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