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Rhyodacite
Rhyodacite

Pegmatite
Pegmatite



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Rhyodacite
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Pegmatite

Rhyodacite vs Pegmatite

Definition

Definition

Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite
Pegmatite rock is a holocrystalline, intrusive igneous rock which is composed of interlocking phaneritic crystals

History

Origin

USA
-

Discoverer

Unknown
R. J. Hauy

Etymology

Rhyo lite + dacite : a rock intermediate between rhyolite and dacite that is the extrusive equivalent of granodiorite
From Greek pegma, pegmat which means- thing joined together + -ite

Class

Igneous Rocks
Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock

Family

Group

Volcanic
Plutonic

Other Categories

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

Texture

Texture

Earthy
Pegmatitic

Color

Black to Grey, Dark Greenish - Grey
Black, Brown, Cream, Green, Grey, Pink, Red, Rust, Silver, White, Yellow

Maintenance

More
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Skeletal
Layered, Banded, Veined and Shiny

Uses

Architecture

Interior Uses

Decorative Aggregates, Interior Decoration
Decorative Aggregates, Flooring, Interior Decoration

Exterior Uses

As Building Stone, Garden Decoration
As Building Stone, As Facing Stone, Paving Stone

Other Architectural Uses

Curbing
Curbing

Industry

Construction Industry

As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping
As Dimension Stone, Building houses or walls, Construction Aggregate, for Road Aggregate, Landscaping

Medical Industry

-
-

Antiquity Uses

Artifacts
Artifacts, Sculpture, Small Figurines

Other Uses

Commercial Uses

Cemetery Markers, Creating Artwork
Creating Artwork, Jewelry, Source of corundum, tourmalines, beryls and topaz

Types

Types

Intermediate volcanic rock
Granite Pegmatite, Gabbro Pegmatite and Diorite Pegmatite

Features

Available in Lots of Colors and Patterns
Generally rough to touch, Is one of the oldest rock, Source of corundum, tourmalines, beryls and topaz

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Absent

Formation

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.
Pegmatite rock is holocrystalline, intrusive igneous rock which is formed by partial melting and dewatering during the process of metamorphism.

Composition

Mineral Content

Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon
Apatite, Beryl, Feldspar, Fluorite, Garnet, Lepidolite, Quartz, Silica, Spodumene, Topaz

Compound Content

Ca, Fe, Potassium Oxide, Potassium, Silicon Dioxide
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, Magnesium Carbonate, MgO, Phosphorus Pentoxide

Transformation

Metamorphism

Types of Metamorphism

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

Weathering

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

Types of Erosion

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

Properties

Physical Properties

Hardness

5.5-67
1 7
👆🏻

Grain Size

Fine Grained
Medium to Coarse Grained

Fracture

Conchoidal
Conchoidal

Streak

Black
White

Porosity

Less Porous
Less Porous

Luster

Greasy to Dull
Grainy, Pearly and Vitreous

Compressive Strength

200.50 N/mm2178.54 N/mm2
0.15 450
👆🏻

Cleavage

-
Perfect

Toughness

2.1
2.1

Specific Gravity

2.34-2.402.6-2.63
0 8.4
👆🏻

Transparency

Opaque
Translucent to Opaque

Density

-9999 g/cm32.6-2.65 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

1.12 kJ/Kg K0.79 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant
Heat Resistant, Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Iran, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Vietnam
China, India, Iran, Japan, Nepal, North Korea, Russia, Saudi Arabia, South Korea

Africa

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

Europe

Austria, Belgium, Finland, France, Germany, Italy, Norway, Sardinia, Spain, Switzerland
Austria, France, Greece, Ireland, Italy, Netherlands, Slovakia, Spain, Turkey, Ukraine

Others

-
-

Deposits in Western Continents

North America

Canada, USA
Canada

South America

-
Brazil

Deposits in Oceania Continent

Australia

-
New South Wales, Queensland, South Australia, Western Australia

Rhyodacite vs Pegmatite Information

Earth’s outer layer is covered by rocks and these rocks have different physical and chemical properties. As two rocks are not same, it’s fun to compare them. You can also know more about Rhyodacite and Pegmatite Reserves. Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite. Pegmatite rock is a holocrystalline, intrusive igneous rock which is composed of interlocking phaneritic crystals. These rocks are composed of many distinct minerals. The process of formation of rocks is different for various rocks. Rocks are quarried from many years for various purposes. You can check out Rhyodacite vs Pegmatite information and Rhyodacite vs Pegmatite characteristics in the upcoming sections.

Rhyodacite vs Pegmatite Characteristics

Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Rhyodacite vs Pegmatite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Rhyodacite and Properties of Pegmatite. Learn more about Rhyodacite vs Pegmatite in the next section. The interior uses of Rhyodacite include Decorative aggregates and Interior decoration whereas the interior uses of Pegmatite include Decorative aggregates, Flooring and Interior decoration. Due to some exceptional properties of Rhyodacite and Pegmatite, they have various applications in construction industry. The uses of Rhyodacite in construction industry include As dimension stone, Construction aggregate, For road aggregate, Landscaping and that of Pegmatite include As dimension stone, Building houses or walls, Construction aggregate, For road aggregate, Landscaping.

More about Rhyodacite and Pegmatite

Here you can know more about Rhyodacite and Pegmatite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Rhyodacite and Pegmatite consists of mineral content and compound content. The mineral content of Rhyodacite includes Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon and mineral content of Pegmatite includes Apatite, Beryl, Feldspar, Fluorite, Garnet, Lepidolite, Quartz, Silica, Spodumene, Topaz. You can also check out the list of all Igneous Rocks. When we have to compare Rhyodacite vs Pegmatite, the texture, color and appearance plays an important role in determining the type of rock. Rhyodacite is available in black to grey, dark greenish - grey colors whereas, Pegmatite is available in black, brown, cream, green, grey, pink, red, rust, silver, white, yellow colors. Appearance of Rhyodacite is Skeletal and that of Pegmatite is Layered, Banded, Veined and Shiny. Properties of rock is another aspect for Rhyodacite vs Pegmatite. The hardness of Rhyodacite is 5.5-6 and that of Pegmatite is 7. The types of Rhyodacite are Intermediate volcanic rock whereas types of Pegmatite are Granite Pegmatite, Gabbro Pegmatite and Diorite Pegmatite. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Rhyodacite is black while that of Pegmatite is white. The specific heat capacity of Rhyodacite is 1.12 kJ/Kg K and that of Pegmatite is 0.79 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Rhyodacite is heat resistant whereas Pegmatite is heat resistant, impact resistant, pressure resistant.