Granodiorite and Dacite

Granodiorite

Dacite

Definition

Granodiorite is a coarse-grained intrusive igneous rock containing quartz and plagioclase, and which has composition in between granite and diorite

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

History

Origin

Unknown

Romania and Moldova, Europe

Discoverer

Unknown

Etymology

From granite + diorite

From Dacia, a province of the Roman Empire which lay between the Danube River and Carpathian Mountains where the rock was first described

Class

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Soft Rock

Family

Group

Plutonic

Volcanic

Other Categories

Coarse Grained Rock, Medium Grained Rock, Opaque Rock

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Granular, Phaneritic

Aphanitic to Porphyritic

Color

Black, Grey, Orange, Pink, White

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

Maintenance

Less

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Yes

Stain Resistant

Wind Resistant

Yes

Acid Resistant

Appearance

Veined or Pebbled

Vesicular

Uses

Architecture

Interior Uses

Bathrooms, Countertops, Decorative Aggregates, Entryways, Floor Tiles, Flooring, Homes, Hotels, Interior Decoration, Stair Treads

Decorative Aggregates, Entryways, Interior Decoration

Exterior Uses

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

As Building Stone, Paving Stone, Garden Decoration

Other Architectural Uses

Not Yet Used

Curbing

Industry

Construction Industry

As Dimension Stone

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

Medical Industry

Not Yet Used

Antiquity Uses

Artifacts, Monuments, Sculpture

Artifacts

Other Uses

Commercial Uses

Curling, Gemstone, Laboratory bench tops, Tombstones

Commemorative Tablets, Creating Artwork

Types

Not Available

Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite

Features

Available in Lots of Colors and Patterns

Host Rock for Lead, Is one of the oldest rock

Archaeological Significance

Monuments

Used

Not Yet Used

Famous Monuments

Data Not Available

Not Applicable

Sculpture

Used

Not Yet Used

Famous Sculptures

Data Not Available

Not Applicable

Pictographs

Used

Petroglyphs

Used

Figurines

Used

Not Yet Used

Fossils

Absent

Formation

Granodiorite is an intrusive igneous rock which is very hard, crystalline and is visibly homogeneous in texture and forms by melting of continental rocks.

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.

Composition

Mineral Content

Amphibole, Biotite, Feldspar, Hornblade, Micas, Muscovite or Illite, Plagioclase, Pyroxene, Quartz

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

Compound Content

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

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

Transformation

Metamorphism

Yes

Types of Metamorphism

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

Burial Metamorphism, Cataclastic Metamorphism

Weathering

Yes

Types of Weathering

Chemical Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

Yes

Types of Erosion

Chemical Erosion, Glacier Erosion, Wind Erosion

Chemical Erosion

Properties

Physical Properties

Hardness

2-2.25

Grain Size

Medium to Coarse Grained

Medium to Fine Coarse Grained

Fracture

Not Available

Conchoidal

Streak

White

Porosity

Less Porous

Luster

Grainy, Pearly and Vitreous

Subvitreous to Dull

Compressive Strength

175.00 N/mm²

Not Available

Cleavage

Not Available

Perfect

Toughness

Not Available

Specific Gravity

2.6-2.7

2.86-2.87

Transparency

Opaque

Translucent

Density

2.6-2.8 g/cm³

2.77-2.771 g/cm³

Thermal Properties

Specific Heat Capacity

0.79 kJ/Kg K

0.92 kJ/Kg K

Resistance

Heat Resistant, Wear Resistant

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

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

Not Yet Found

Africa

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

Not Yet Found

Europe

Austria, Belgium, Finland, France, Germany, Italy, Norway, Sardinia, Spain, Switzerland, The Czech Republic, Venezuela

France, Greece, Romania, Scotland, Spain

Others

Not Yet Found

Deposits in Western Continents

North America

Canada, USA

USA

South America

Not Yet Found

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

Deposits in Oceania Continent

Australia

Not Yet Found

New Zealand, South Australia, Western Australia

Summary >>

<< Reserves

All about Granodiorite and Dacite Properties

Know all about Granodiorite and Dacite properties here. All properties of rocks are important as they define the type of rock and its application. Granodiorite and Dacite belong to Igneous Rocks.Texture of Granodiorite is Granular, Phaneritic whereas that of Dacite is Aphanitic to Porphyritic. Granodiorite appears Veined or Pebbled and Dacite appears Vesicular. The luster of Granodiorite is grainy, pearly and vitreous while that of Dacite is subvitreous to dull. Granodiorite is available in black, grey, orange, pink, white colors whereas Dacite is available in bluish - grey, brown, grey, light to dark grey colors. The commercial uses of Granodiorite are curling, gemstone, laboratory bench tops, tombstones and that of Dacite are commemorative tablets, creating artwork.