Dacite

Icelandite

Dacite and Icelandite

Dacite

Icelandite

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1 Definition

1.1 Definition

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

Icelandite belongs to volcanic igneous rocks which is rich in iron and belongs to andesite rock

1.2 History

1.2.1 Origin

Romania and Moldova, Europe

Iceland

1.2.2 Discoverer

Unknown

Ian S. E. Carmichael

1.3 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 its origin place near Cenozoic volcano near the parsonage Þingmúli in East Iceland

1.4 Class

Igneous Rocks

1.4.1 Sub-Class

Durable Rock, Soft Rock

Durable Rock, Hard Rock

1.5 Family

1.5.1 Group

Volcanic

1.6 Other Categories

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Fine Grained Rock, Opaque Rock

2 Texture

2.1 Texture

Aphanitic to Porphyritic

2.2 Color

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

Bluish - Grey, Grey, Pink, Yellow

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

Vesicular

Dull and Soft

3 Uses

3.1 Architecture

3.1.1 Interior Uses

Decorative Aggregates, Entryways, Interior Decoration

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration, Kitchens

3.1.2 Exterior Uses

As Building Stone, Paving Stone, Garden Decoration

Office Buildings, Roof Tiles

3.1.3 Other Architectural Uses

Curbing

3.2 Industry

3.2.1 Construction Industry

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

Cobblestones, Construction Aggregate, for Road Aggregate

3.2.2 Medical Industry

Not Yet Used

3.3 Antiquity Uses

Artifacts

Artifacts, Jewellery, Sculpture, Small Figurines

3.4 Other Uses

3.4.1 Commercial Uses

Commemorative Tablets, Creating Artwork

Cemetery Markers, Creating Artwork

4 Types

4.1 Types

Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite

Not Available

4.2 Features

Host Rock for Lead, Is one of the oldest rock

Generally rough to touch, High silica content, Is one of the oldest 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

Not Used

4.3.6 Petroglyphs

Used

Not Used

4.3.7 Figurines

Not Yet Used

Used

4.4 Fossils

Absent

5 Formation

5.1 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.

Icelandite 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

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

5.2.2 Compound Content

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

Silicon Dioxide

5.3 Transformation

5.3.1 Metamorphism

✔ ✘

5.3.2 Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism

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

5.3.3 Weathering

✔ ✘

5.3.4 Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering

5.3.5 Erosion

✔ ✘

5.3.6 Types of Erosion

Chemical Erosion

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

6 Properties

6.1 Physical Properties

6.1.1 Hardness

2-2.257

1 7

7.3.2 Grain Size

Medium to Fine Coarse Grained

Very fine-grained

7.3.3 Fracture

Conchoidal

Uneven

7.3.4 Streak

White

7.3.5 Porosity

Less Porous

7.3.6 Luster

Subvitreous to Dull

Vitreous

7.3.7 Compressive Strength

NANA

0.15 450

7.3.8 Cleavage

Perfect

Not Available

7.3.9 Toughness

Not Available

1.1

7.3.10 Specific Gravity

2.86-2.872.5-2.8

0 8.4

7.3.11 Transparency

Translucent

Opaque

7.3.12 Density

2.77-2.771 g/cm³2.11-2.36 g/cm³

0 1400

7.4 Thermal Properties

7.4.1 Specific Heat Capacity

0.92 kJ/Kg K2.39 kJ/Kg K

0.14 3.2

7.4.2 Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Pressure Resistant, Scratch Resistant, Wear Resistant

8 Reserves

8.1 Deposits in Eastern Continents

8.1.1 Asia

Not Yet Found

India, Indonesia, Japan, Nepal, South Korea

8.1.2 Africa

Not Yet Found

Egypt, Ethiopia, Morocco, Namibia, South Africa, Tanzania

8.1.3 Europe

France, Greece, Romania, Scotland, Spain

Austria, Finland, Germany, Italy, Romania, Turkey, United Kingdom

8.1.4 Others

Not Yet Found

8.2 Deposits in Western Continents

8.2.1 North America

USA

Mexico, USA

8.2.2 South America

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

8.3 Deposits in Oceania Continent

8.3.1 Australia

New Zealand, South Australia, Western Australia

New South Wales, New Zealand, Western Australia

All about Dacite and Icelandite Properties

Know all about Dacite and Icelandite properties here. All properties of rocks are important as they define the type of rock and its application. Dacite and Icelandite belong to Igneous Rocks.Texture of Dacite is Aphanitic to Porphyritic whereas that of Icelandite is Aphanitic to Porphyritic. Dacite appears Vesicular and Icelandite appears Dull and Soft. The luster of Dacite is subvitreous to dull while that of Icelandite is vitreous. Dacite is available in bluish - grey, brown, grey, light to dark grey colors whereas Icelandite is available in bluish - grey, grey, pink, yellow colors. The commercial uses of Dacite are commemorative tablets, creating artwork and that of Icelandite are cemetery markers, creating artwork.