Tephrite

Rhyodacite

Tephrite and Rhyodacite

Tephrite

Rhyodacite

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1 Definition

1.1 Definition

Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock

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

1.2 History

1.2.1 Origin

Germany

USA

1.2.2 Discoverer

Van Tooren

Unknown

1.3 Etymology

From Greek tephra, ashes from Indo-European base, to burn

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

1.4 Class

Igneous Rocks

1.4.1 Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

1.5 Family

1.5.1 Group

Volcanic

1.6 Other Categories

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

Fine Grained Rock, Opaque Rock

2 Texture

2.1 Texture

Aphanitic to Porphyritic

Earthy

2.2 Color

Black, Brown, Colourless, Green, Grey, White

Black to Grey, Dark Greenish - Grey

2.3 Maintenance

Less

2.4 Durability

Durable

2.4.1 Water Resistant

✔ ✘

2.4.2 Scratch Resistant

✔ ✘

2.4.3 Stain Resistant

✔ ✘

2.4.4 Wind Resistant

✔ ✘

2.4.5 Acid Resistant

✔ ✘

2.5 Appearance

Vesicular

Skeletal

3 Uses

3.1 Architecture

3.1.1 Interior Uses

Decorative Aggregates, Flooring, Homes, Interior Decoration

Decorative Aggregates, Interior Decoration

3.1.2 Exterior Uses

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

As Building Stone, Garden Decoration

3.1.3 Other Architectural Uses

Curbing

3.2 Industry

3.2.1 Construction Industry

Landscaping

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

3.2.2 Medical Industry

Not Yet Used

3.3 Antiquity Uses

Artifacts, Sculpture

Artifacts

3.4 Other Uses

3.4.1 Commercial Uses

Production of Lime, Soil Conditioner

Cemetery Markers, Creating Artwork

4 Types

4.1 Types

Not Available

4.2 Features

Host Rock for Lead

Available in Lots of Colors and Patterns

4.3 Archaeological Significance

4.3.1 Monuments

Not Yet Used

4.3.2 Famous Monuments

Not Applicable

4.3.3 Sculpture

Used

Not Yet Used

4.3.4 Famous Sculptures

Data Not Available

Not Applicable

4.3.5 Pictographs

Not Used

Used

4.3.6 Petroglyphs

Not Used

Used

4.3.7 Figurines

Used

Not Yet Used

4.4 Fossils

Absent

5 Formation

5.1 Formation

Tephrite 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.

5.2 Composition

5.2.1 Mineral Content

Alkali feldspar, Nepheline, Plagioclase, Pyroxene

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

5.2.2 Compound Content

CaO, Carbon Dioxide, MgO, Silicon Dioxide

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

5.3 Transformation

5.3.1 Metamorphism

✔ ✘

5.3.2 Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

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

5.3.3 Weathering

✔ ✘

5.3.4 Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

5.3.5 Erosion

✔ ✘

5.3.6 Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

6 Properties

6.1 Physical Properties

6.1.1 Hardness

6.55.5-6

1 7

6.1.2 Grain Size

Medium to Fine Coarse Grained

Fine Grained

6.1.3 Fracture

Uneven

Conchoidal

6.1.4 Streak

Bluish Black

Black

6.1.5 Porosity

Very Less Porous

Less Porous

6.1.6 Luster

Subvitreous to Dull

Greasy to Dull

6.1.7 Compressive Strength

90.00 N/mm²200.50 N/mm²

0.15 450

6.1.8 Cleavage

Crenulation and Pervasive

Not Available

6.1.9 Toughness

2.4

2.1

6.1.10 Specific Gravity

2.862.34-2.40

0 8.4

6.1.11 Transparency

Opaque

6.1.12 Density

2.8-2.9 g/cm³Not Available

0 1400

6.2 Thermal Properties

6.2.1 Specific Heat Capacity

0.92 kJ/Kg K1.12 kJ/Kg K

0.14 3.2

6.2.2 Resistance

Heat Resistant, Impact Resistant

Heat Resistant

7 Reserves

7.1 Deposits in Eastern Continents

7.1.1 Asia

Not Yet Found

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

7.1.2 Africa

Namibia, Uganda

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

7.1.3 Europe

Germany, Hungary, Italy, Portugal, Spain

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

7.1.4 Others

Not Yet Found

7.2 Deposits in Western Continents

7.2.1 North America

USA

Canada, USA

7.2.2 South America

Not Yet Found

7.3 Deposits in Oceania Continent

7.3.1 Australia

New Zealand, Western Australia

Not Yet Found

All about Tephrite and Rhyodacite Properties

Know all about Tephrite and Rhyodacite properties here. All properties of rocks are important as they define the type of rock and its application. Tephrite and Rhyodacite belong to Igneous Rocks.Texture of Tephrite is Aphanitic to Porphyritic whereas that of Rhyodacite is Earthy. Tephrite appears Vesicular and Rhyodacite appears Skeletal. The luster of Tephrite is subvitreous to dull while that of Rhyodacite is greasy to dull. Tephrite is available in black, brown, colourless, green, grey, white colors whereas Rhyodacite is available in black to grey, dark greenish - grey colors. The commercial uses of Tephrite are production of lime, soil conditioner and that of Rhyodacite are cemetery markers, creating artwork.