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Dacite and Trachyandesite


Trachyandesite and Dacite


Definition

Definition
Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite  
Trachyandesite is an extrusive igneous rock.  

History
  
  

Origin
Romania and Moldova, Europe  
Indonesia  

Discoverer
Unknown  
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 French trachyandésite, trachy + andésite andesite, a lava intermediate in composition between trachyte and andesite  

Class
Igneous Rocks  
Igneous Rocks  

Sub-Class
Durable Rock, Soft Rock  
Durable Rock, Medium Hardness Rock  

Family
  
  

Group
Volcanic  
Volcanic  

Other Categories
Fine Grained Rock, Medium Grained Rock, Opaque Rock  
Fine Grained Rock, Opaque Rock  

Texture

Texture
Aphanitic to Porphyritic  
Glassy, Massive, Porphyritic, Scoriaceous, Vesicular  

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

Maintenance
Less  
Less  

Durability
Durable  
Durable  

Water Resistant
No  
Yes  

Scratch Resistant
No  
Yes  

Stain Resistant
No  
No  

Wind Resistant
No  
No  

Acid Resistant
No  
No  

Appearance
Vesicular  
Dull and Soft  

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Entryways, Interior Decoration  
Countertops, Decorative Aggregates, Homes, Interior Decoration  

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

Other Architectural Uses
Curbing  
Curbing  

Industry
  
  

Construction Industry
As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping  
Building houses or walls, Cobblestones, for Road Aggregate, Rail Track Ballast, Roadstone  

Medical Industry
-  
-  

Antiquity Uses
Artifacts  
Artifacts, Sculpture  

Other Uses
  
  

Commercial Uses
Commemorative Tablets, Creating Artwork  
Creating Artwork, Pottery  

Types

Types
Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite  
Basaltic Trachyandesite  

Features
Host Rock for Lead, Is one of the oldest rock  
Has High structural resistance against erosion and climate, Very fine grained rock  

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.   
Trachyandesite 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.  

Composition
  
  

Mineral Content
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon  
Alkali feldspar, Biotite, Olivine, Plagioclase, Pyroxene, Sodic plagioclase  

Compound Content
Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon Dioxide  
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide  

Transformation
  
  

Metamorphism
Yes  
Yes  

Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism  
Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism  

Weathering
Yes  
Yes  

Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering  
Biological Weathering, Chemical Weathering, Mechanical Weathering  

Erosion
Yes  
Yes  

Types of Erosion
Chemical Erosion  
Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion  

Properties

Physical Properties
  
  

Hardness
2-2.25  
4-5  

Grain Size
Medium to Fine Coarse Grained  
Fine Grained  

Fracture
Conchoidal  
Conchoidal  

Streak
White  
Light to dark brown  

Porosity
Less Porous  
Less Porous  

Luster
Subvitreous to Dull  
Earthy  

Compressive Strength
70.00 N/mm2  
35
37.40 N/mm2  
99+

Cleavage
Perfect  
Perfect  

Toughness
-  
2.3  

Specific Gravity
2.86-2.87  
2.8-3  

Transparency
Translucent  
Opaque  

Density
2.77-2.771 g/cm3  
2.9-3.1 g/cm3  

Thermal Properties
  
  

Specific Heat Capacity
0.92 kJ/Kg K  
10
0.84 kJ/Kg K  
15

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

Reserves

Deposits in Eastern Continents
  
  

Asia
-  
India, Russia  

Africa
-  
South Africa  

Europe
France, Greece, Romania, Scotland, Spain  
Iceland  

Others
-  
-  

Deposits in Western Continents
  
  

North America
USA  
Canada, USA  

South America
Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela  
Brazil  

Deposits in Oceania Continent
  
  

Australia
New Zealand, South Australia, Western Australia  
-  

Summary >>
<< Reserves

All about Dacite and Trachyandesite Properties

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

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