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Basanite  and Dacite


Dacite and Basanite 


Definition

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

History
  
  

Origin
Unknown   
Romania and Moldova, Europe   

Discoverer
Unknown   
Unknown   

Etymology
From Latin basanites + -ite   
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   
Igneous Rocks   

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

Family
  
  

Group
Not Applicable   
Volcanic   

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

Texture

Texture
Aphanitic to Porphyritic   
Aphanitic to Porphyritic   

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

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
No   

Scratch Resistant
Yes   
No   

Stain Resistant
Yes   
No   

Wind Resistant
Yes   
No   

Acid Resistant
Yes   
No   

Appearance
Glassy or Pearly   
Vesicular   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Whetstones   
Curbing   

Industry
  
  

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

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Monuments   
Artifacts   

Other Uses
  
  

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

Types

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

Features
Clasts are smooth to touch, Easily splits into thin plates, Has High structural resistance against erosion and climate, Used as a touchstone   
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
Not Yet Used   
Not Yet Used   

Famous Sculptures
Not Applicable   
Not Applicable   

Pictographs
Not Used   
Used   

Petroglyphs
Not Used   
Used   

Figurines
Not Yet Used   
Not Yet Used   

Fossils
Absent   
Absent   

Formation

Formation
Basanite is a fine-grained, hard rock that forms when bits of lava shoot out of volcanoes.   
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
Augite, Feldspar, Ilmenite, Olivine, Plagioclase   
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon   

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

Transformation
  
  

Metamorphism
Yes   
Yes   

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

Weathering
Yes   
Yes   

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

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
7   
2-2.25   

Grain Size
Fine Grained   
Medium to Fine Coarse Grained   

Fracture
Uneven, Splintery or Conchoidal   
Conchoidal   

Streak
White   
White   

Porosity
Highly Porous   
Less Porous   

Luster
Waxy and Dull   
Subvitreous to Dull   

Cleavage
Non-Existent   
Perfect   

Toughness
1.5   
Not Available   

Specific Gravity
2.5-2.8   
2.86-2.87   

Transparency
Translucent to Opaque   
Translucent   

Density
2.7 g/cm3   
2.77-2.771 g/cm3   

Thermal Properties
  
  

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

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

Reserves

Deposits in Eastern Continents
  
  

Asia
Not Yet Found   
Not Yet Found   

Africa
Uganda   
Not Yet Found   

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

Others
Greenland, Mid-Atlantic Ridge   
Not Yet Found   

Deposits in Western Continents
  
  

North America
USA   
USA   

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

Deposits in Oceania Continent
  
  

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

Summary >>
<< Reserves

All about Basanite  and Dacite Properties

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

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