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Jasperoid and Porphyry


Porphyry and Jasperoid


Definition

Definition
Jasperoid is a rare, peculiar type of metasomatic alteration of rocks   
Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix   

History
  
  

Origin
USA   
Egypt   

Discoverer
Unknown   
Unknown   

Etymology
From silica, the main mineral content of Jasperoid   
From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites   

Class
Sedimentary Rocks   
Igneous Rocks   

Sub-Class
Durable Rock, Medium Hardness Rock   
Durable Rock, Hard Rock   

Family
  
  

Group
Not Applicable   
Plutonic   

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

Texture

Texture
Earthy   
Porphyritic   

Color
Black, Brown, Colourless, Green, Grey, Pink, White   
Black, Brown, Colourless, Green, Grey, Red, Rust, White   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
No   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
Yes   

Wind Resistant
No   
No   

Acid Resistant
No   
Yes   

Appearance
Glassy or Pearly   
Dull   

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Floor Tiles, Homes, Interior Decoration   
Decorative Aggregates, Interior Decoration   

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement, Manufacture of Magnesium and Dolomite Refractories, Production of Glass and Ceramics, Serves as an Oil and Gas Reservoir rock   
Construction Aggregate   

Medical Industry
Taken as a Supplement for Calcium or Magnesium   
Not Yet Used   

Antiquity Uses
Artifacts, Jewellery, Monuments, Sculpture   
Artifacts, Monuments, Sculpture   

Other Uses
  
  

Commercial Uses
An Oil and Gas Reservoir, As a Feed Additive for Livestock, Gemstone, Metallurgical Flux, Production of Lime, Soil Conditioner, Source of Magnesia (MgO)   
Creating Artwork, Gemstone, Jewelry   

Types

Types
Not Available   
Rhomb Porphyry   

Features
Host Rock for Lead, Traps for subsurface fluids like Oil and Natural Gas., Zinc and Copper Deposits   
Generally rough to touch, Is one of the oldest rock, Surfaces are often shiny   

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
Present   
Absent   

Formation

Formation
Jasperoid is a rare and peculiar type of metasomatic alteration of rocks. It is formed by extreme alteration of wall rocks within a shear zone which may occur in sediments, andesites, trachytes and basalts.   
Porphyry is formed in two stages: the magma cools slowly deep within the crust or the magma is cools rapidly as it erupts from a volcano, creating small grains that are usually invisible to naked eye.   

Composition
  
  

Mineral Content
Clay Minerals, Pyrite, Quartz, Sulfides   
Biotite, Chert, Feldspar, Garnet, Graphite, Quartz, Silica   

Compound Content
NaCl, CaO, Carbon Dioxide, Magnesium Carbonate, MgO   
Aluminium Oxide, CaO, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Titanium Dioxide   

Transformation
  
  

Metamorphism
Yes   
Yes   

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

Weathering
No   
Yes   

Types of Weathering
Not Applicable   
Biological Weathering, Chemical Weathering, Not Registered   

Erosion
No   
Yes   

Types of Erosion
Not Applicable   
Chemical Erosion, Coastal Erosion, Glacier Erosion   

Properties

Physical Properties
  
  

Hardness
3.5-4   
6-7   

Grain Size
Medium to Fine Coarse Grained   
Fine Grained   

Fracture
Conchoidal   
Irregular   

Streak
White   
White   

Porosity
Less Porous   
Less Porous   

Luster
Vitreous and Pearly   
Dull   

Compressive Strength
140.00 N/mm2   
15
Not Available   

Cleavage
Perfect   
Imperfect   

Toughness
1   
1.7   

Specific Gravity
2.8-3   
2.5-4   

Transparency
Transparent to Translucent   
Translucent to Opaque   

Density
2.8-2.9 g/cm3   
2.5-2.52 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
0.92 kJ/Kg K   
10
Not Available   

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

Reserves

Deposits in Eastern Continents
  
  

Asia
China, India   
China, Kazakhstan, South Korea, Thailand, Turkey, Vietnam   

Africa
Morocco, Namibia   
Egypt, Ethiopia, Ghana, South Africa   

Europe
Austria, Italy, Romania, Spain, Switzerland   
Finland, France, Germany, Great Britain, Hungary, Iceland, Ireland, Italy, Netherlands, Norway, Romania, Sweden, Switzerland   

Others
Not Yet Found   
Greenland   

Deposits in Western Continents
  
  

North America
Mexico, USA   
Canada, Cuba, Jamaica, USA   

South America
Brazil, Colombia   
Bolivia, Brazil, Colombia, Ecuador, Paraguay   

Deposits in Oceania Continent
  
  

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

Summary >>
<< Reserves

All about Jasperoid and Porphyry Properties

Know all about Jasperoid and Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Jasperoid belongs to Sedimentary Rocks while Porphyry belongs to Igneous Rocks.Texture of Jasperoid is Earthy whereas that of Porphyry is Porphyritic. Jasperoid appears Glassy or Pearly and Porphyry appears Dull. The luster of Jasperoid is vitreous and pearly while that of Porphyry is dull. Jasperoid is available in black, brown, colourless, green, grey, pink, white colors whereas Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors. The commercial uses of Jasperoid are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo) and that of Porphyry are creating artwork, gemstone, jewelry.

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