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Hornblendite and Nephelinite


Nephelinite and Hornblendite


Definition

Definition
Hornblendite is a type of igneous plutonic rock consisting mainly of amphibole hornblende and is a type of Amphibolite rock   
Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite).   

History
  
  

Origin
Unknown   
Brazil   

Discoverer
Unknown   
Unknown   

Etymology
From German, Horn horn + blende   
from French néphéline, from Greek nephelē   

Class
Igneous Rocks   
Igneous Rocks   

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

Family
  
  

Group
Plutonic   
Plutonic   

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

Texture

Texture
Banded, Foliated, Massive   
Aphanitic   

Color
Black, Brown, Green, Grey   
Black, Brown, Colourless, Green, Grey, White   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
No   
Yes   

Wind Resistant
Yes   
Yes   

Acid Resistant
No   
Yes   

Appearance
Foliated   
Skeletal   

Uses

Architecture
  
  

Interior Uses
Countertops, Decorative Aggregates, Entryways, Flooring, Homes, Hotels, Interior Decoration, Kitchens   
Decorative Aggregates, Homes, Interior Decoration   

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
As Dimension Stone, Building houses or walls, Cobblestones, Construction Aggregate, for Road Aggregate, Landscaping, Production of Glass and Ceramics, Roadstone   
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Sculpture, Small Figurines   
Artifacts, Monuments, Sculpture, Small Figurines   

Other Uses
  
  

Commercial Uses
Cemetery Markers, Commemorative Tablets, Creating Artwork   
Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)   

Types

Types
Hornblende Gabbro and Hornblende Peridotite   
Peralkaline Nephelinite   

Features
Clasts are smooth to touch, Matrix variable, Surfaces are often shiny   
Host Rock for Lead   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Used   

Famous Monuments
Not Applicable   
Data Not Available   

Sculpture
Used   
Used   

Famous Sculptures
Data Not Available   
Data Not Available   

Pictographs
Not Used   
Not Used   

Petroglyphs
Not Used   
Not Used   

Figurines
Used   
Used   

Fossils
Absent   
Absent   

Formation

Formation
Hornblendite 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.   
Nephelinite 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, Calcite, Hornblade, Magnetite, Plagioclase, Wollastonite   
Clinopyroxene, Nepheline, Plagioclase   

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

Transformation
  
  

Metamorphism
No   
Yes   

Types of Metamorphism
Not Applicable   
Contact 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, Water Erosion, Wind Erosion   
Chemical Erosion, Water Erosion, Wind Erosion   

Properties

Physical Properties
  
  

Hardness
6-7   
6.5   

Grain Size
Medium to Coarse Grained   
Fine Grained   

Fracture
Irregular to Conchoidal   
Flat   

Streak
White to Grey   
White   

Porosity
Less Porous   
Less Porous   

Luster
Vitreous to Dull   
Vitreous to Metallic   

Compressive Strength
Not Available   
35.00 N/mm2   
29

Cleavage
Irregular   
Imperfect   

Toughness
2.3   
2.7   

Specific Gravity
2.5   
2.4-2.9   

Transparency
Opaque   
Opaque   

Density
2.85-3.07 g/cm3   
2.5-3 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
Not Available   
0.88 kJ/Kg K   
13

Resistance
Heat Resistant, Pressure Resistant, Wear Resistant   
Heat Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
Russia, Turkey   
Japan   

Africa
Burundi, Djibouti, Eritrea, Ethiopia, Kenya, Madagascar, Rwanda, Somalia, South Africa, Sudan, Tanzania, Uganda   
Rwanda, Tanzania   

Europe
Germany, Greece, Iceland, Norway, Poland   
Not Yet Found   

Others
Not Yet Found   
Hawaii Islands   

Deposits in Western Continents
  
  

North America
Canada, USA   
Canada, USA   

South America
Brazil   
Colombia   

Deposits in Oceania Continent
  
  

Australia
South Australia, Western Australia   
Not Yet Found   

Summary >>
<< Reserves

All about Hornblendite and Nephelinite Properties

Know all about Hornblendite and Nephelinite properties here. All properties of rocks are important as they define the type of rock and its application. Hornblendite and Nephelinite belong to Igneous Rocks.Texture of Hornblendite is Banded, Foliated, Massive whereas that of Nephelinite is Aphanitic. Hornblendite appears Foliated and Nephelinite appears Skeletal. The luster of Hornblendite is vitreous to dull while that of Nephelinite is vitreous to metallic. Hornblendite is available in black, brown, green, grey colors whereas Nephelinite is available in black, brown, colourless, green, grey, white colors. The commercial uses of Hornblendite are cemetery markers, commemorative tablets, creating artwork and that of Nephelinite are creating artwork, soil conditioner, source of magnesia (mgo).

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