Epidosite and Rhyodacite

Epidosite

Rhyodacite

Definition

Epidosite is a highly altered epidote and quartz bearing rock which is a type of metasomatite, essentially altered basalt

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

History

Origin

Unknown

USA

Discoverer

Unknown

Etymology

Not Available

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

Coarse Grained Rock, Fine Grained Rock, Opaque Rock

Fine Grained Rock, Opaque Rock

Texture

Glassy, Massive, Porphyritic, Scoriaceous, Vesicular

Earthy

Color

Black, Brown, Light to Dark Grey

Black to Grey, Dark Greenish - Grey

Maintenance

Less

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Yes

Stain Resistant

Yes

Wind Resistant

Yes

Acid Resistant

Appearance

Dull and Soft

Skeletal

Uses

Architecture

Interior Uses

Decorative Aggregates, Floor Tiles, Homes, Hotels, Interior Decoration

Decorative Aggregates, Interior Decoration

Exterior Uses

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

As Building Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

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

Medical Industry

Not Yet Used

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts

Other Uses

Commercial Uses

Commemorative Tablets, Creating Artwork

Cemetery Markers, Creating Artwork

Types

Alkaline Basalt, Boninite, High Alumina Basalt, Mid Ocean Ridge Basalt (MORB), Tholeiitic Basalt, Basaltic trachyandesite, Mugearite and Shoshonite

Not Available

Features

Has High structural resistance against erosion and climate, Very fine grained rock

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

Epidosite 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.

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

Olivine, Plagioclase, Pyroxene

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

Compound Content

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

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

Transformation

Metamorphism

Yes

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Hydrothermal Metamorphism, Impact 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

Not Applicable

Chemical Erosion, Coastal Erosion, Glacier Erosion

Properties

Physical Properties

Hardness

5.5-6

Grain Size

Fine to Coarse Grained

Fine Grained

Fracture

Conchoidal

Streak

White to Grey

Black

Porosity

Less Porous

Luster

Not Available

Greasy to Dull

Compressive Strength

Not Available

200.50 N/mm²

Cleavage

Not Available

Toughness

2.3

2.1

Specific Gravity

2.8-3

2.34-2.40

Transparency

Opaque

Density

Not Available

Thermal Properties

Specific Heat Capacity

Not Available

1.12 kJ/Kg K

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia

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

Africa

South Africa

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

Europe

Iceland

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

Others

Not Yet Found

Deposits in Western Continents

North America

Canada, USA

South America

Brazil

Not Yet Found

Deposits in Oceania Continent

Australia

Not Yet Found

Summary >>

<< Reserves

All about Epidosite and Rhyodacite Properties

Know all about Epidosite and Rhyodacite properties here. All properties of rocks are important as they define the type of rock and its application. Epidosite and Rhyodacite belong to Igneous Rocks.Texture of Epidosite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Rhyodacite is Earthy. Epidosite appears Dull and Soft and Rhyodacite appears Skeletal. The luster of Epidosite is not available while that of Rhyodacite is greasy to dull. Epidosite is available in black, brown, light to dark grey colors whereas Rhyodacite is available in black to grey, dark greenish - grey colors. The commercial uses of Epidosite are commemorative tablets, creating artwork and that of Rhyodacite are cemetery markers, creating artwork.