Rhyodacite

Trachyandesite

Rhyodacite and Trachyandesite

Rhyodacite

Trachyandesite

Add ⊕

1 Definition

1.1 Definition

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

Trachyandesite is an extrusive igneous rock.

1.2 History

1.2.1 Origin

USA

Indonesia

1.2.2 Discoverer

Unknown

1.3 Etymology

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

From French trachyandésite, trachy + andésite andesite, a lava intermediate in composition between trachyte and andesite

1.4 Class

Igneous Rocks

1.4.1 Sub-Class

Durable Rock, Medium Hardness Rock

1.5 Family

1.5.1 Group

Volcanic

1.6 Other Categories

Fine Grained Rock, Opaque Rock

2 Texture

2.1 Texture

Earthy

Glassy, Massive, Porphyritic, Scoriaceous, Vesicular

2.2 Color

Black to Grey, Dark Greenish - Grey

Black, Brown, Light to Dark 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

Skeletal

Dull and Soft

3 Uses

3.1 Architecture

3.1.1 Interior Uses

Decorative Aggregates, Interior Decoration

Countertops, Decorative Aggregates, Homes, Interior Decoration

3.1.2 Exterior Uses

As Building Stone, Garden Decoration

As Building Stone, As Facing Stone, Garden Decoration

3.1.3 Other Architectural Uses

Curbing

3.2 Industry

3.2.1 Construction Industry

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

Building houses or walls, Cobblestones, for Road Aggregate, Rail Track Ballast, Roadstone

3.2.2 Medical Industry

Not Yet Used

3.3 Antiquity Uses

Artifacts

Artifacts, Sculpture

3.4 Other Uses

3.4.1 Commercial Uses

Cemetery Markers, Creating Artwork

Creating Artwork, Pottery

4 Types

4.1 Types

Not Available

Basaltic Trachyandesite

4.2 Features

Available in Lots of Colors and Patterns

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

4.3 Archaeological Significance

4.3.1 Monuments

Not Yet Used

4.3.2 Famous Monuments

Not Applicable

4.3.3 Sculpture

Not Yet Used

Used

4.3.4 Famous Sculptures

Not Applicable

Data Not Available

4.3.5 Pictographs

Used

4.3.6 Petroglyphs

Used

4.3.7 Figurines

Not Yet Used

Used

4.4 Fossils

Absent

5 Formation

5.1 Formation

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.

Trachyandesite 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

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

Alkali feldspar, Biotite, Olivine, Plagioclase, Pyroxene, Sodic plagioclase

5.2.2 Compound Content

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

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

5.3 Transformation

5.3.1 Metamorphism

✔ ✘

5.3.2 Types of Metamorphism

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

Cataclastic Metamorphism, Contact 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

Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion

6 Properties

6.1 Physical Properties

6.1.1 Hardness

5.5-64-5

1 7

6.1.8 Grain Size

Fine Grained

6.1.9 Fracture

Conchoidal

6.1.10 Streak

Black

Light to dark brown

6.1.11 Porosity

Less Porous

6.1.12 Luster

Greasy to Dull

Earthy

6.1.13 Compressive Strength

200.50 N/mm²37.40 N/mm²

0.15 450

6.1.17 Cleavage

Not Available

Perfect

6.1.18 Toughness

2.1

2.3

6.1.19 Specific Gravity

2.34-2.402.8-3

0 8.4

6.1.22 Transparency

Opaque

6.1.23 Density

Not Available2.9-3.1 g/cm³

0 1400

6.3 Thermal Properties

6.3.1 Specific Heat Capacity

1.12 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

7.3.2 Resistance

Heat Resistant

Heat Resistant, Pressure Resistant, Wear Resistant

8 Reserves

8.1 Deposits in Eastern Continents

8.1.1 Asia

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

India, Russia

8.1.2 Africa

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

South Africa

8.1.3 Europe

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

Iceland

8.1.4 Others

Not Yet Found

8.2 Deposits in Western Continents

8.2.1 North America

Canada, USA

8.2.2 South America

Not Yet Found

Brazil

8.3 Deposits in Oceania Continent

8.3.1 Australia

Not Yet Found

All about Rhyodacite and Trachyandesite Properties

Know all about Rhyodacite and Trachyandesite properties here. All properties of rocks are important as they define the type of rock and its application. Rhyodacite and Trachyandesite belong to Igneous Rocks.Texture of Rhyodacite is Earthy whereas that of Trachyandesite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular. Rhyodacite appears Skeletal and Trachyandesite appears Dull and Soft. The luster of Rhyodacite is greasy to dull while that of Trachyandesite is earthy. Rhyodacite is available in black to grey, dark greenish - grey colors whereas Trachyandesite is available in black, brown, light to dark grey colors. The commercial uses of Rhyodacite are cemetery markers, creating artwork and that of Trachyandesite are creating artwork, pottery.