Arkose

Argillite

Arkose and Argillite

Arkose

Argillite

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Definition

Arkose is a sedimentary rock, specifically a type of sandstone containing at least 25% feldspar

Argillites are highly compact sedimentary or slightly metamorphosed rocks that consist largely or wholly of particles of clay or silt but lack the fissility of shale or the cleavage characteristic of slate

History

Origin

France

Discoverer

Alexandre Brongniart

Unknown

Etymology

From Auvergne region of France used by a French geologist Alexandre Brongniart in 1826 who applied this term to some feldspathic sandstones

From Latin Argilla (clay) and -ite in English which became agrilla+ -ite = Argillite

Class

Sedimentary Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Soft Rock

Family

Group

Other Categories

Coarse Grained Rock, Opaque Rock

Fine Grained Rock, Opaque Rock

Texture

Clastic

Clastic, Polished

Color

Reddish Brown

Dark Grey to Black, Pink, Red, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Rough and Dull

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

Paving Stone, Office Buildings

As Building Stone, Garden Decoration, Office Buildings

Other Architectural Uses

Whetstones

Curbing, Whetstones

Industry

Construction Industry

Cement Manufacture, Construction Aggregate, for Road Aggregate, Production of Glass and Ceramics, Raw material for the manufacture of mortar

Used for flooring, stair treads, borders and window sills.

Medical Industry

Antiquity Uses

Artifacts, Sculpture, Small Figurines

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

In aquifers, Soil Conditioner, Source of Magnesia (MgO), Tombstones

Fire resistant, Used to manufracture paperweights and bookends

Types

Arkose

Metamorphic rock

Features

Available in Lots of Colors and Patterns, Generally rough to touch, Is one of the oldest rock

Is one of the oldest rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Present

Formation

Arkose rock forms from the weathering of feldspar-rich igneous or metamorphic rock, most commonly granitic rocks, which are primarily composed of quartz and feldspar.

An argillite is a fine-grained sedimentary rock mainly composed of clay particles which forms from lithified muds which contain variable amounts of silt-sized particles.

Composition

Mineral Content

Calcite, Clay, Clay Minerals, Feldspar, Micas, Quartz

Biotite, Chlorite, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyrite, Quartz

Compound Content

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

Iron(III) Oxide, Potassium Oxide, MgO, Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion, Glacier Erosion, Water Erosion, Wind Erosion

Chemical Erosion

Properties

Physical Properties

Hardness

6-72-3

1 7

👆🏻

Grain Size

Coarse Grained

Fine Grained

Fracture

Conchoidal

Conchoidal to Uneven

Streak

White

White to Grey

Porosity

Highly Porous

Luster

Dull

Waxy and Dull

Compressive Strength

80.00 N/mm²-

0.15 450

👆🏻

Cleavage

Slaty

Toughness

2.6

Specific Gravity

02.56-2.68

0 8.4

👆🏻

Transparency

Opaque

Density

-9999 g/cm³2.54-2.66 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.78 kJ/Kg K0.87 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant

Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Kazakhstan, Mongolia, Russia, Uzbekistan

Bangladesh, China, India, Russia

Africa

Namibia, Nigeria, South Africa

Ethiopia, Kenya, Morocco, South Africa, Tanzania

Europe

Austria, Denmark, Germany, Great Britain, Netherlands, Norway, Poland, Sweden, Switzerland, United Kingdom

Austria, France, Germany, Greece, Italy, Romania, Scotland, Spain, Switzerland

Others

Greenland

Deposits in Western Continents

North America

Canada, USA

USA

South America

Brazil

Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela

Deposits in Oceania Continent

Australia

New South Wales, New Zealand

New South Wales, New Zealand, Queensland, Victoria, Western Australia

All about Arkose and Argillite Properties

Know all about Arkose and Argillite properties here. All properties of rocks are important as they define the type of rock and its application. Arkose and Argillite belong to Sedimentary Rocks.Texture of Arkose is Clastic whereas that of Argillite is Clastic, Polished. Arkose appears Rough and Dull and Argillite appears Rough and Dull. The luster of Arkose is dull while that of Argillite is waxy and dull. Arkose is available in reddish brown colors whereas Argillite is available in dark grey to black, pink, red, white colors. The commercial uses of Arkose are in aquifers, soil conditioner, source of magnesia (mgo), tombstones and that of Argillite are fire resistant, used to manufracture paperweights and bookends.