Dacite and Serpentinite

Dacite

Serpentinite

Definition

Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite

A hydration and metamorphic transformation of ultramafic rock from the Earth's mantle is called as serpentinization, a group of minerals is formed by serpentinization compose rock 'serpentinite'.

History

Origin

Romania and Moldova, Europe

USA

Discoverer

Unknown

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 English word serpentinization.

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Soft Rock

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Not Applicable

Other Categories

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Fine Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Earthy

Color

Bluish - Grey, Brown, Grey, Light to Dark Grey

Black, Brown, Colourless, Green, Grey, White

Maintenance

Less

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Stain Resistant

Yes

Wind Resistant

Acid Resistant

Appearance

Vesicular

Rough and Dull

Uses

Architecture

Interior Uses

Decorative Aggregates, Entryways, Interior Decoration

Decorative Aggregates, Interior Decoration

Exterior Uses

As Building Stone, Paving Stone, Garden Decoration

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

Other Architectural Uses

Curbing

Industry

Construction Industry

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

As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement

Medical Industry

Not Yet Used

Antiquity Uses

Artifacts

Artifacts, Jewellery, Monuments, Sculpture

Other Uses

Commercial Uses

Commemorative Tablets, Creating Artwork

Types

Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite

Jadeitite

Features

Host Rock for Lead, Is one of the oldest rock

Host Rock for Lead

Archaeological Significance

Monuments

Not Yet Used

Used

Famous Monuments

Not Applicable

Data Not Available

Sculpture

Not Yet Used

Used

Famous Sculptures

Not Applicable

Data Not Available

Pictographs

Used

Petroglyphs

Used

Figurines

Not Yet Used

Used

Fossils

Absent

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. Serpentinite 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

Carbonate, Magnetite, Pyrrhotite, Serpentine, Sulfides

Compound Content

Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon Dioxide

Ca, CaO, Carbon Dioxide, KCl, MgO, Sulfur Dioxide, Sulphur

Transformation

Metamorphism

Yes

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism

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

Weathering

Yes

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Not Applicable

Erosion

Yes

Types of Erosion

Chemical Erosion

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

Properties

Physical Properties

Hardness

2-2.25

3-5

Grain Size

Medium to Fine Coarse Grained

Very fine-grained

Fracture

Conchoidal

Uneven

Streak

White

White, Greenish White or Grey

Porosity

Less Porous

Luster

Subvitreous to Dull

Waxy and Dull

Compressive Strength

Not Available

310.00 N/mm²

Cleavage

Perfect

Irregular

Toughness

Not Available

Specific Gravity

2.86-2.87

2.79-3

Transparency

Translucent

Opaque

Density

2.77-2.771 g/cm³

2.5-3 g/cm³

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K

0.95 kJ/Kg K

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

Not Yet Found

India, Saudi Arabia, Singapore, South Korea

Africa

Not Yet Found

Ethiopia, Western Africa

Europe

France, Greece, Romania, Scotland, Spain

England, Georgia, Switzerland, United Kingdom

Others

Not Yet Found

Deposits in Western Continents

North America

USA

Canada

South America

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

Colombia

Deposits in Oceania Continent

Australia

New Zealand, South Australia, Western Australia

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

Summary >>

<< Reserves

All about Dacite and Serpentinite Properties

Know all about Dacite and Serpentinite properties here. All properties of rocks are important as they define the type of rock and its application. Dacite belongs to Igneous Rocks while Serpentinite belongs to Metamorphic Rocks.Texture of Dacite is Aphanitic to Porphyritic whereas that of Serpentinite is Earthy. Dacite appears Vesicular and Serpentinite appears Rough and Dull. The luster of Dacite is subvitreous to dull while that of Serpentinite is waxy and dull. Dacite is available in bluish - grey, brown, grey, light to dark grey colors whereas Serpentinite is available in black, brown, colourless, green, grey, white colors. The commercial uses of Dacite and Serpentinite are commemorative tablets, creating artwork.