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Dacite and Basanite 


Basanite  and Dacite


Definition

Definition
Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite  
Basanite is a black basaltic rock which mainly contains plagioclase, augite, olivine and nepheline and is formerly used as a touchstone  

History
  
  

Origin
Romania and Moldova, Europe  
Unknown  

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 Latin basanites + -ite  

Class
Igneous Rocks  
Igneous Rocks  

Sub-Class
Durable Rock, Soft Rock  
Durable Rock, Hard Rock  

Family
  
  

Group
Volcanic  
Not Applicable  

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

Texture

Texture
Aphanitic to Porphyritic  
Aphanitic to Porphyritic  

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

Maintenance
Less  
Less  

Durability
Durable  
Durable  

Water Resistant
No  
Yes  

Scratch Resistant
No  
Yes  

Stain Resistant
No  
Yes  

Wind Resistant
No  
Yes  

Acid Resistant
No  
Yes  

Appearance
Vesicular  
Glassy or Pearly  

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing  
Whetstones  

Industry
  
  

Construction Industry
As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping  
Arrowheads, Construction Aggregate, Cutting Tool, Spear Points  

Medical Industry
Not Available  
Not Available  

Antiquity Uses
Artifacts  
Artifacts, Monuments  

Other Uses
  
  

Commercial Uses
Commemorative Tablets, Creating Artwork  
As a touchstone, Creating Artwork, Gemstone, In fire-starting tools, Manufacture of tools, Metallurgical Flux, Jewelry, To ignite fire, Used in flintlock firearms  

Types

Types
Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite  
Nepheline-Basanite, Analcite-Basanite and Leucite-Basanite  

Features
Host Rock for Lead, Is one of the oldest rock  
Clasts are smooth to touch, Easily splits into thin plates, Has High structural resistance against erosion and climate, Used as a touchstone  

Archaeological Significance
  
  

Monuments
Not Yet Used  
Used  

Famous Monuments
Not Applicable  
Not Available  

Sculpture
Not Yet Used  
Not Yet Used  

Famous Sculptures
Not Applicable  
Not Applicable  

Pictographs
Used  
Not Used  

Petroglyphs
Used  
Not Used  

Figurines
Not Yet Used  
Not Yet Used  

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.   
Basanite is a fine-grained, hard rock that forms when bits of lava shoot out of volcanoes.  

Composition
  
  

Mineral Content
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon  
Augite, Feldspar, Ilmenite, Olivine, Plagioclase  

Compound Content
Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon Dioxide  
Potassium Oxide, Sodium Oxide, Silicon Dioxide  

Transformation
  
  

Metamorphism
Yes  
Yes  

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

Weathering
Yes  
Yes  

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

Erosion
Yes  
Yes  

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

Properties

Physical Properties
  
  

Hardness
2-2.25  
7  

Grain Size
Medium to Fine Coarse Grained  
Fine Grained  

Fracture
Conchoidal  
Uneven, Splintery or Conchoidal  

Streak
White  
White  

Porosity
Less Porous  
Highly Porous  

Luster
Subvitreous to Dull  
Waxy and Dull  

Cleavage
Perfect  
Not Available  

Toughness
Not Available  
1.5  

Specific Gravity
2.86-2.87  
2.5-2.8  

Transparency
Translucent  
Translucent to Opaque  

Density
2.77-2.771 g/cm3  
2.7 g/cm3  

Thermal Properties
  
  

Specific Heat Capacity
0.92 kJ/Kg K  
10
0.74 kJ/Kg K  
19

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

Reserves

Deposits in Eastern Continents
  
  

Asia
Not Available  
Not Available  

Africa
Not Available  
Uganda  

Europe
France, Greece, Romania, Scotland, Spain  
Germany, Hungary, Italy, Spain  

Others
Not Available  
Greenland, Mid-Atlantic Ridge  

Deposits in Western Continents
  
  

North America
USA  
USA  

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

Deposits in Oceania Continent
  
  

Australia
New Zealand, South Australia, Western Australia  
New South Wales, New Zealand, Queensland, South Australia, Western Australia  

Summary >>
<< Reserves

All about Dacite and Basanite  Properties

Know all about Dacite and Basanite  properties here. All properties of rocks are important as they define the type of rock and its application. Dacite and Basanite  belong to Igneous Rocks.Texture of Dacite is Aphanitic to Porphyritic whereas that of Basanite  is Aphanitic to Porphyritic. Dacite appears Vesicular and Basanite  appears Glassy or Pearly. The luster of Dacite is subvitreous to dull while that of Basanite  is waxy and dull. Dacite is available in bluish - grey, brown, grey, light to dark grey colors whereas Basanite  is available in black, brown, green, grey, red, white colors. The commercial uses of Dacite are commemorative tablets, creating artwork and that of Basanite  are as a touchstone, creating artwork, gemstone, in fire-starting tools, manufacture of tools, metallurgical flux, jewelry, to ignite fire, used in flintlock firearms.

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