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Dacite
Dacite

Skarn
Skarn



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Dacite
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Skarn

Dacite vs Skarn

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Definition

Definition

Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite
Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin

History

Origin

Romania and Moldova, Europe
USA, Australia

Discoverer

Unknown
Tornebohm

Etymology

From Dacia, a province of the Roman Empire which lay between the Danube River and Carpathian Mountains where the rock was first described
From an old Swedish mining term originally used to describe a type of silicate gangue or waste rock.

Class

Igneous Rocks
Metamorphic Rocks

Sub-Class

Durable Rock, Soft Rock
Durable Rock, Hard Rock

Family

Group

Volcanic
-

Other Categories

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

Texture

Texture

Aphanitic to Porphyritic
Earthy, Mud-rich, Rough

Color

Bluish - Grey, Brown, Grey, Light to Dark Grey
Black, Brown, Green, Grey, White

Maintenance

Less
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Vesicular
Dull

Uses

Architecture

Interior Uses

Decorative Aggregates, Entryways, Interior Decoration
Decorative Aggregates, Entryways, Interior Decoration

Exterior Uses

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

Other Architectural Uses

Curbing
Curbing

Industry

Construction Industry

As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping
As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Gold and Silver production, Manufacture of Magnesium and Dolomite Refractories

Medical Industry

-
-

Antiquity Uses

Artifacts
Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

Commemorative Tablets, Creating Artwork
Creating Artwork, Gemstone, Jewelry, Metallurgical Flux, Source of Magnesia (MgO)

Types

Types

Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite
Endoskarns

Features

Host Rock for Lead, Is one of the oldest rock
Host Rock for Lead, Zinc and Copper Deposits

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Absent

Formation

Formation

Dacitic magma is formed by the subduction of young oceanic crust under a thick felsic continental plate. Further, the Oceanic crust is hydrothermally altered as quartz and sodium are added.
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Skarn is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.

Composition

Mineral Content

Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon
Calcite, Enstatite, Epidote, Garnet, Magnetite, Pyroxene, Titanite

Compound Content

Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon Dioxide
Au, CaO, Carbon Dioxide, Cu, Fe, MgO

Transformation

Metamorphism

Types of Metamorphism

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

Weathering

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering
-

Erosion

Types of Erosion

Chemical Erosion
-

Properties

Physical Properties

Hardness

2-2.256.5
1 7
👆🏻

Grain Size

Medium to Fine Coarse Grained
Fine Grained

Fracture

Conchoidal
Irregular

Streak

White
Light to dark brown

Porosity

Less Porous
Less Porous

Luster

Subvitreous to Dull
Waxy and Dull

Compressive Strength

70.00 N/mm270.00 N/mm2
0.15 450
👆🏻

Cleavage

Perfect
Slaty

Toughness

-
2.4

Specific Gravity

2.86-2.872.86
0 8.4
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Transparency

Translucent
Opaque

Density

2.77-2.771 g/cm32.8-2.9 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K0.92 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

-
China, India, Russia, Saudi Arabia, South Korea, Sri Lanka

Africa

-
South Africa, Western Africa

Europe

France, Greece, Romania, Scotland, Spain
United Kingdom

Others

-
-

Deposits in Western Continents

North America

USA
Canada

South America

Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela
Brazil, Colombia, Paraguay

Deposits in Oceania Continent

Australia

New Zealand, South Australia, Western Australia
Central Australia, Western Australia

Dacite vs Skarn 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 Dacite and Skarn Reserves. Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite. Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin. 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 Dacite vs Skarn information and Dacite vs Skarn characteristics in the upcoming sections.

Dacite vs Skarn 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. Dacite vs Skarn characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Dacite and Properties of Skarn. Learn more about Dacite vs Skarn in the next section. The interior uses of Dacite include Decorative aggregates, Entryways and Interior decoration whereas the interior uses of Skarn include Decorative aggregates, Entryways and Interior decoration. Due to some exceptional properties of Dacite and Skarn, they have various applications in construction industry. The uses of Dacite in construction industry include As dimension stone, Construction aggregate, For road aggregate, Landscaping and that of Skarn include As a flux in the production of steel and pig iron, As a sintering agent in steel industry to process iron ore, As dimension stone, Gold and silver production, Manufacture of magnesium and dolomite refractories.

More about Dacite and Skarn

Here you can know more about Dacite and Skarn. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Dacite and Skarn consists of mineral content and compound content. The mineral content of Dacite includes Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon and mineral content of Skarn includes Calcite, Enstatite, Epidote, Garnet, Magnetite, Pyroxene, Titanite. You can also check out the list of all Igneous Rocks. When we have to compare Dacite vs Skarn, the texture, color and appearance plays an important role in determining the type of rock. Dacite is available in bluish - grey, brown, grey, light to dark grey colors whereas, Skarn is available in black, brown, green, grey, white colors. Appearance of Dacite is Vesicular and that of Skarn is Dull. Properties of rock is another aspect for Dacite vs Skarn. The hardness of Dacite is 2-2.25 and that of Skarn is 6.5. The types of Dacite are Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite whereas types of Skarn are Endoskarns. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Dacite is white while that of Skarn is light to dark brown. The specific heat capacity of Dacite is 0.92 kJ/Kg K and that of Skarn is 0.92 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Dacite is heat resistant, impact resistant, pressure resistant, wear resistant whereas Skarn is heat resistant.