Definition
Phonolite is an uncommon extrusive igneous rock volcanic rock of intermediate chemical composition between felsic and mafic
  
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 the Greek meaning sounding stone because of the metallic sound it produces if an unfractured plate is hit
  
from French néphéline, from Greek nephelē
  
Class
Igneous Rocks
  
Igneous Rocks
  
Sub-Class
Durable Rock, Medium Hardness Rock
  
Durable Rock, Hard Rock
  
Family
  
  
Group
Not Applicable
  
Plutonic
  
Other Categories
Fine Grained Rock, Opaque Rock
  
Fine Grained Rock, Opaque Rock
  
Texture
Granular
  
Aphanitic
  
Color
Brown, Buff, Cream, Green, Grey, Pink, White
  
Black, Brown, Colourless, Green, Grey, White
  
Maintenance
Less
  
Less
  
Durability
Durable
  
Durable
  
Water Resistant
Yes
  
Yes
  
Scratch Resistant
Yes
  
Yes
  
Stain Resistant
Yes
  
Yes
  
Wind Resistant
No
  
Yes
  
Acid Resistant
Yes
  
Yes
  
Appearance
Banded and Foilated
  
Skeletal
  
Architecture
  
  
Interior Uses
Countertops, Decorative Aggregates, Flooring, Homes
  
Decorative Aggregates, Homes, Interior Decoration
  
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
  
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
  
Other Architectural Uses
Curbing
  
Curbing
  
Industry
  
  
Construction Industry
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Manufacture of Magnesium and Dolomite Refractories, Production of Glass and Ceramics
  
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate
  
Medical Industry
Not Yet Used
  
Not Yet Used
  
Antiquity Uses
Artifacts, Monuments, Sculpture
  
Artifacts, Monuments, Sculpture, Small Figurines
  
Other Uses
  
  
Commercial Uses
Cemetery Markers, Creating Artwork
  
Creating Artwork, Soil Conditioner, Source of Magnesia (MgO)
  
Types
Kenyte
  
Peralkaline Nephelinite
  
Features
Application of acids on the surface causes cloudy frosting, Available in Lots of Colors and Patterns, Dissolves in hydrochloric acid, Is one of the oldest rock
  
Host Rock for Lead
  
Archaeological Significance
  
  
Monuments
Used
  
Used
  
Famous Monuments
Data Not Available
  
Data Not Available
  
Sculpture
Used
  
Used
  
Famous Sculptures
Data Not Available
  
Data Not Available
  
Pictographs
Used
  
Not Used
  
Petroglyphs
Used
  
Not Used
  
Figurines
Used
  
Used
  
Fossils
Absent
  
Absent
  
Formation
Phonolite are formed due to alkaline igneous activities and are generally formed in thick continental crustal areas or in Cordilleran subduction zones.
  
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
Albite, Amphibole, Biotite, Cancrinite, Feldspar, Hornblende, Plagioclase, Pyroxene, Sodalite
  
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
Yes
  
Yes
  
Types of Metamorphism
Contact Metamorphism
  
Contact 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, Water Erosion, Wind Erosion
  
Chemical Erosion, Water Erosion, Wind Erosion
  
Physical Properties
  
  
Hardness
5.5-6
  
6.5
  
Grain Size
Fine Grained
  
Fine Grained
  
Fracture
Conchoidal to Uneven
  
Flat
  
Streak
White
  
White
  
Porosity
Less Porous
  
Less Porous
  
Luster
Greasy to Dull
  
Vitreous to Metallic
  
Compressive Strength
150.00 N/mm2
  
14
35.00 N/mm2
  
29
Cleavage
Poor
  
Imperfect
  
Toughness
Not Available
  
2.7
  
Specific Gravity
2.6
  
2.4-2.9
  
Transparency
Translucent to Opaque
  
Opaque
  
Density
2.6 g/cm3
  
2.5-3 g/cm3
  
Thermal Properties
  
  
Specific Heat Capacity
Not Available
  
0.88 kJ/Kg K
  
13
Resistance
Heat Resistant, Impact Resistant, Wear Resistant
  
Heat Resistant
  
Deposits in Eastern Continents
  
  
Asia
Indonesia, Iran, Russia, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Turkmenistan, Vietnam
  
Japan
  
Africa
Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa
  
Rwanda, Tanzania
  
Europe
Andorra, Finland, France, Germany, Great Britain, Italy, Norway, Portugal, Spain, Sweden
  
Not Yet Found
  
Others
Greenland
  
Hawaii Islands
  
Deposits in Western Continents
  
  
North America
Canada, USA
  
Canada, USA
  
South America
Brazil, Chile, Colombia, Uruguay, Venezuela
  
Colombia
  
Deposits in Oceania Continent
  
  
Australia
New Zealand, Queensland, South Australia, Tasmania, Western Australia
  
Not Yet Found
  
Phonolite vs Nephelinite Characteristics
Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Phonolite vs Nephelinite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Phonolite and Properties of Nephelinite. Learn more about Phonolite vs Nephelinite in the next section. The interior uses of Phonolite include Countertops, Decorative aggregates, Flooring and Homes whereas the interior uses of Nephelinite include Decorative aggregates, Homes and Interior decoration. Due to some exceptional properties of Phonolite and Nephelinite, they have various applications in construction industry. The uses of Phonolite in construction industry include As dimension stone, Cement manufacture, Construction aggregate, For road aggregate, Landscaping, Making natural cement, Manufacture of magnesium and dolomite refractories, Production of glass and ceramics and that of Nephelinite include As dimension stone, Cement manufacture, Construction aggregate, For road aggregate.
More about Phonolite and Nephelinite
Here you can know more about Phonolite and Nephelinite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Phonolite and Nephelinite consists of mineral content and compound content. The mineral content of Phonolite includes Albite, Amphibole, Biotite, Cancrinite, Feldspar, Hornblende, Plagioclase, Pyroxene, Sodalite and mineral content of Nephelinite includes Clinopyroxene, Nepheline, Plagioclase. You can also check out the list of all Igneous Rocks. When we have to compare Phonolite vs Nephelinite, the texture, color and appearance plays an important role in determining the type of rock. Phonolite is available in brown, buff, cream, green, grey, pink, white colors whereas, Nephelinite is available in black, brown, colourless, green, grey, white colors. Appearance of Phonolite is Banded and Foilated and that of Nephelinite is Skeletal. Properties of rock is another aspect for Phonolite vs Nephelinite. The hardness of Phonolite is 5.5-6 and that of Nephelinite is 6.5. The types of Phonolite are Kenyte whereas types of Nephelinite are Peralkaline Nephelinite. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Phonolite and Nephelinite is white. The specific heat capacity of Phonolite is Not Available and that of Nephelinite is 0.88 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Phonolite is heat resistant, impact resistant, wear resistant whereas Nephelinite is heat resistant.