Definition
Foidolite is a rare type of coarse-grained intrusive igneous rock with a feldspathoid mineral content greater than 60%
  
Chert is a hard, dark, opaque sedimentary rock which is composed of silica with an amorphous fine-grained texture
  
History
  
  
Discoverer
Unknown
  
Unknown
  
Etymology
From the mineral feldspathoid which is the main content of rock
  
From flint-like quartz, 1670s, of unknown origin- a local term, which has been taken into geological use
  
Class
Igneous Rocks
  
Sedimentary Rocks
  
Sub-Class
Durable Rock, Soft Rock
  
Durable Rock, Hard Rock
  
Family
  
  
Group
Plutonic
  
Not Applicable
  
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
  
Fine Grained Rock, Opaque Rock
  
Texture
Earthy
  
Banded, Rough
  
Color
Black, Brown, Colourless, Green, Grey, Pink, White
  
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
  
No
  
Acid Resistant
No
  
Yes
  
Appearance
Dull
  
Glassy or Pearly
  
Architecture
  
  
Interior Uses
Decorative Aggregates, Interior Decoration
  
Decorative Aggregates, Homes
  
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
  
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings
  
Other Architectural Uses
Curbing
  
Curbing
  
Industry
  
  
Construction Industry
As Dimension Stone, Cement Manufacture, for Road Aggregate
  
Arrowheads, Construction Aggregate, Cutting Tool, Spear Points
  
Medical Industry
Taken as a Supplement for Calcium or Magnesium
  
Not Yet Used
  
Antiquity Uses
Artifacts, Monuments, Sculpture
  
Artifacts, Monuments
  
Other Uses
  
  
Commercial Uses
Cemetery Markers, Commemorative Tablets, Creating Artwork
  
Creating Artwork, Gemstone, In fire-starting tools, Jewelry, To ignite fire, Used in flintlock firearms
  
Types
Not Available
  
Flint, Jasper, Radiolarite, Common Chert, Chalcedony, Agate, Onyx, Opal, Magadi-type Chert, Porcelanite, Siliceous Sinter
  
Features
Host Rock for Lead
  
Clasts are smooth to touch, Easily splits into thin plates, Has High structural resistance against erosion and climate
  
Archaeological Significance
  
  
Monuments
Used
  
Used
  
Famous Monuments
Data Not Available
  
Data Not Available
  
Sculpture
Used
  
Not Yet Used
  
Famous Sculptures
Data Not Available
  
Not Applicable
  
Pictographs
Used
  
Not Used
  
Petroglyphs
Used
  
Not Used
  
Figurines
Used
  
Not Yet Used
  
Fossils
Absent
  
Present
  
Formation
Foidolites 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.
  
Chert forms when microcrystals of silicon dioxide grow within soft sediments that become limestone or chalk. The chert formation can be either of chemical or biological origin.
  
Composition
  
  
Mineral Content
Amphibole, Biotite, Feldspar, Olivine, Plagioclase, Pyroxene
  
Quartz, Silicon
  
Compound Content
Aluminium Oxide, CaO, Iron(III) Oxide, FeO
  
Silicon Dioxide
  
Transformation
  
  
Metamorphism
Yes
  
No
  
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism
  
Not Applicable
  
Weathering
No
  
No
  
Types of Weathering
Not Applicable
  
Not Applicable
  
Erosion
No
  
Yes
  
Types of Erosion
Not Applicable
  
Chemical Erosion
  
Physical Properties
  
  
Hardness
1.5
  
6.5-7
  
Grain Size
Medium to Fine Coarse Grained
  
Very fine-grained
  
Fracture
Conchoidal
  
Uneven, Splintery or Conchoidal
  
Streak
White
  
White
  
Porosity
Very Less Porous
  
Highly Porous
  
Luster
Subvitreous to Dull
  
Waxy and Dull
  
Compressive Strength
Not Available
  
450.00 N/mm
2
  
1
Cleavage
Perfect
  
Non-Existent
  
Toughness
Not Available
  
1.5
  
Specific Gravity
2.86
  
2.5-2.8
  
Transparency
Translucent
  
Translucent to Opaque
  
Density
Not Available
  
2.7 g/cm3
  
Thermal Properties
  
  
Specific Heat Capacity
Not Available
  
0.74 kJ/Kg K
  
19
Resistance
Heat Resistant, Wear Resistant
  
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
  
Deposits in Eastern Continents
  
  
Asia
Russia
  
China, India, Iran, Japan, Oman, Russia, Saudi Arabia, Taiwan, Thailand, Vietnam
  
Africa
South Africa, Western Africa
  
Kenya, Morocco, South Africa, Tanzania
  
Europe
Not Yet Found
  
Austria, France, Greece, Italy, Malta, Poland, Portugal, Serbia, Spain, Sweden, United Kingdom
  
Others
Not Yet Found
  
Greenland, Mid-Atlantic Ridge
  
Deposits in Western Continents
  
  
North America
Canada, USA
  
Canada, Mexico, USA
  
South America
Not Yet Found
  
Bolivia, Brazil
  
Deposits in Oceania Continent
  
  
Australia
Central Australia, Western Australia
  
New South Wales, Queensland, South Australia, Western Australia
  
All about Foidolite and Chert Properties
Know all about Foidolite and Chert properties here. All properties of rocks are important as they define the type of rock and its application. Foidolite belongs to Igneous Rocks while Chert belongs to Sedimentary Rocks.Texture of Foidolite is Earthy whereas that of Chert is Banded, Rough. Foidolite appears Dull and Chert appears Glassy or Pearly. The luster of Foidolite is subvitreous to dull while that of Chert is waxy and dull. Foidolite is available in black, brown, colourless, green, grey, pink, white colors whereas Chert is available in black, brown, green, grey, red, white colors. The commercial uses of Foidolite are cemetery markers, commemorative tablets, creating artwork and that of Chert are creating artwork, gemstone, in fire-starting tools, jewelry, to ignite fire, used in flintlock firearms.