Anthracite

Amphibolite

Anthracite and Amphibolite

Anthracite

Amphibolite

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Definition

Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster

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

History

Origin

Pennsylvania, U.S.

Discoverer

Unknown

Alexandre Brongniart

Etymology

From Greek anthrakites, from anthrax, anthrak meaning coal

From Amphibole + -ite

Class

Metamorphic Rocks

Sub-Class

Durable Rock, Soft Rock

Durable Rock, Hard Rock

Family

Group

Other Categories

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

Coarse Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Amorphous, Glassy

Banded, Foliated, Massive

Color

Black, Brown, Dark Brown, Grey, Light to Dark Grey

Black, Brown, Green, Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Veined or Pebbled

Foliated

Uses

Architecture

Interior Uses

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

Exterior Uses

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

Other Architectural Uses

Curbing

Industry

Construction Industry

Cement Manufacture, for Road Aggregate, Making natural cement, Steel Production

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

Medical Industry

In Chemical and Pharmaceutical Industry, Manufacture of Aspirins

Antiquity Uses

Artifacts, Sculpture, Small Figurines

Other Uses

Commercial Uses

Alumina Refineries, Electricity Generation, Liquid Fuel, Manufacture of Soap, Solvents, Dyes, Plastics and Fibres, Paper Industry

Cemetery Markers, Commemorative Tablets, Creating Artwork

Types

Semi-anthracite and Meta-anthracite

Hornblendite

Features

Helps in production of Heat and Electricity, Used as fossil fuel

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

Anthracite forms from the accumulation of plant debris in a swamp environment. When plant debris dies and falls into the swamp, the standing water of the swamp protects it from decay.

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

Calcite, Clay, Clay Minerals

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

Compound Content

Carbon, Hydrogen, Nitrogen, Oxygen, Sulphur

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, Contact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Glacier Erosion, Sea Erosion, Wind Erosion

Properties

Physical Properties

Hardness

1-1.56-7

1 7

👆🏻

Grain Size

Medium to Fine Coarse Grained

Medium to Coarse Grained

Fracture

Conchoidal

Irregular to Conchoidal

Streak

Black

White to Grey

Porosity

Less Porous

Luster

Shiny

Vitreous to Dull

Compressive Strength

-90.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

2.3

Specific Gravity

1.1-1.42.5

0 8.4

👆🏻

Transparency

Opaque

Density

1.25-2.5 g/cm³2.85-3.07 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

1.32 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Water Resistant

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Bangladesh, Burma, Cambodia, China, India, Indonesia, Kazakhstan, Malaysia, Mongolia, Pakistan, Turkey, Vietnam

Russia, Turkey

Africa

Botswana, Kenya, Morocco, Mozambique, South Africa, Tanzania

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

Europe

Belgium, Bulgaria, England, France, Germany, Greece, Hungary, Kosovo, Netherlands, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, The Czech Republic, Ukraine, United Kingdom

Germany, Greece, Iceland, Norway, Poland

Others

Deposits in Western Continents

North America

Canada, Mexico, USA

Canada, USA

South America

Brazil, Chile, Colombia, Venezuela

Brazil

Deposits in Oceania Continent

Australia

New South Wales, Queensland, Victoria

South Australia, Western Australia

All about Anthracite and Amphibolite Properties

Know all about Anthracite and Amphibolite properties here. All properties of rocks are important as they define the type of rock and its application. Anthracite and Amphibolite belong to Metamorphic Rocks.Texture of Anthracite is Amorphous, Glassy whereas that of Amphibolite is Banded, Foliated, Massive. Anthracite appears Veined or Pebbled and Amphibolite appears Foliated. The luster of Anthracite is shiny while that of Amphibolite is vitreous to dull. Anthracite is available in black, brown, dark brown, grey, light to dark grey colors whereas Amphibolite is available in black, brown, green, grey colors. The commercial uses of Anthracite are alumina refineries, electricity generation, liquid fuel, manufacture of soap, solvents, dyes, plastics and fibres, paper industry and that of Amphibolite are cemetery markers, commemorative tablets, creating artwork.