Scoria and Rhyodacite

Scoria

Rhyodacite

Rhyodacite and Scoria

Definition

Scoria is a dark-colored extrusive igneous rock with abundant round bubble-like cavities

Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite

History

Origin

Unknown

USA

Discoverer

Unknown

Etymology

From late Middle English (denoting slag from molten metal), from Greek skōria refuse, from skōr dung

Rhyo lite + dacite : a rock intermediate between rhyolite and dacite that is the extrusive equivalent of granodiorite

Class

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Vesicular

Earthy

Color

Black, Brown, Dark Grey to Black, Red

Black to Grey, Dark Greenish - Grey

Maintenance

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Yes

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Glassy and Vesicular

Skeletal

Uses

Architecture

Interior Uses

Decorative Aggregates, Interior Decoration

Exterior Uses

Garden Decoration, Paving Stone

As Building Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

Cement Manufacture, Construction Aggregate, for Road Aggregate, In landscaping and drainage works

As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping

Medical Industry

Not Yet Used

Antiquity Uses

Artifacts, Monuments, Sculpture

Artifacts

Other Uses

Commercial Uses

As a traction material on snow-covered roads, Creating Artwork, High-temperature insulation, In gas barbecue grills

Cemetery Markers, Creating Artwork

Types

Not Available

Features

Available in Lots of Colors and Patterns, Generally rough to touch, Surfaces are often shiny

Available in Lots of Colors and Patterns

Archaeological Significance

Monuments

Used

Not Yet Used

Famous Monuments

Data Not Available

Not Applicable

Sculpture

Used

Not Yet Used

Famous Sculptures

Data Not Available

Not Applicable

Pictographs

Used

Petroglyphs

Used

Figurines

Used

Not Yet Used

Fossils

Absent

Formation

Scoria forms when magma containing huge amount of dissolved gas flows from a volcano during an eruption.

Rhyodacite 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.

Composition

Mineral Content

Apatite, Biotite, Calcite, Feldspar, Hematite, Hornblade, Ilmenite, Magnetite, Olivine, Pyroxene, Quartz, Silica

Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon

Compound Content

Ca, NaCl

Ca, Fe, Potassium Oxide, NA, Potassium, Silicon Dioxide

Transformation

Metamorphism

Yes

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

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

Weathering

Yes

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

Yes

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

Properties

Physical Properties

Hardness

5-6

5.5-6

Grain Size

Fine Grained

Fracture

Conchoidal

Streak

White

Black

Porosity

Highly Porous

Less Porous

Luster

Subvitreous to Dull

Greasy to Dull

Compressive Strength

Not Available

200.50 N/mm²

Cleavage

Perfect

Not Available

Toughness

2.1

Specific Gravity

Not Available

2.34-2.40

Transparency

Opaque

Density

Not Available

Thermal Properties

Specific Heat Capacity

Not Available

1.12 kJ/Kg K

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

Afghanistan, Indonesia, Japan, Russia

China, India, Iran, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Vietnam

Africa

Ethiopia, Kenya, Tanzania

Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa

Europe

Greece, Hungary, Iceland, Italy, Turkey

Austria, Belgium, Finland, France, Germany, Italy, Norway, Sardinia, Spain, Switzerland

Others

Not Yet Found

Deposits in Western Continents

North America

Bahamas, Barbados, Canada, Costa Rica, Cuba, Jamaica, Mexico, USA

Canada, USA

South America

Argentina, Chile, Ecuador, Peru

Not Yet Found

Deposits in Oceania Continent

Australia

New Zealand, Western Australia

Not Yet Found

Summary >>

<< Reserves

All about Scoria and Rhyodacite Properties

Know all about Scoria and Rhyodacite properties here. All properties of rocks are important as they define the type of rock and its application. Scoria and Rhyodacite belong to Igneous Rocks.Texture of Scoria is Vesicular whereas that of Rhyodacite is Earthy. Scoria appears Glassy and Vesicular and Rhyodacite appears Skeletal. The luster of Scoria is subvitreous to dull while that of Rhyodacite is greasy to dull. Scoria is available in black, brown, dark grey to black, red colors whereas Rhyodacite is available in black to grey, dark greenish - grey colors. The commercial uses of Scoria are as a traction material on snow-covered roads, creating artwork, high-temperature insulation, in gas barbecue grills and that of Rhyodacite are cemetery markers, creating artwork.