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Gossan
Gossan

Porphyry
Porphyry



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Gossan vs Porphyry

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Definition

Definition

Gossan is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein.
Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix

History

Origin

Indonesia
Egypt

Discoverer

Cornish Gossen
Unknown

Etymology

From Cornish gossen from gos, blood from Old Cornish guit
From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites

Class

Metamorphic Rocks
Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock

Family

Group

-
Plutonic

Other Categories

Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock

Texture

Texture

Rough, Sandy
Porphyritic

Color

Brown, Brown- Black, Gold, Green, Rust
Black, Brown, Green, Grey, Red, Rust, White

Maintenance

Less
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Dull and Banded
Dull

Uses

Architecture

Interior Uses

Countertops, Decorative Aggregates, Interior Decoration
Decorative Aggregates, Interior Decoration

Exterior Uses

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

Other Architectural Uses

Curbing
Curbing

Industry

Construction Industry

As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate
Construction Aggregate

Medical Industry

-
-

Antiquity Uses

Artifacts
Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

Cemetery Markers, Commemorative Tablets, Gemstone
Creating Artwork, Gemstone, Jewelry

Types

Types

Translocated gossan and Leakage gossan
Rhomb Porphyry

Features

Clasts are smooth to touch, Easily splits into thin plates
Generally rough to touch, Is one of the oldest rock, Surfaces are often shiny

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Absent

Formation

Formation

Earth movements can cause rocks to be either deeply buried or squeezed and hence the rocks are heated and put under great pressure.
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

Apatite, Augite, Biotite, Bronzite, Calcite, Chert, Epidote, Feldspar, Hornblende, Micas, Plagioclase, Pyroxene, Quartz, Sulfides, Zircon
Biotite, Chert, Feldspar, Garnet, Graphite, Quartz, Silica

Compound Content

Aluminium Oxide, CaO, Fe, FeO, Silicon Dioxide, Sulphur
Aluminium Oxide, CaO, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Titanium Dioxide

Transformation

Metamorphism

Types of Metamorphism

-
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

Types of Weathering

-
Biological Weathering, Chemical Weathering

Erosion

Types of Erosion

Chemical Erosion, Sea Erosion, Wind Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion

Properties

Physical Properties

Hardness

4-56-7
1 7
👆🏻

Grain Size

Fine to Medium Grained
Fine Grained

Fracture

Conchoidal
Irregular

Streak

White to Grey
White

Porosity

Highly Porous
Less Porous

Luster

Metallic
Dull

Compressive Strength

-150.00 N/mm2
0.15 450
👆🏻

Cleavage

-
-

Toughness

-
1.7

Specific Gravity

2.02.5-4
0 8.4
👆🏻

Transparency

Opaque
Translucent to Opaque

Density

-9999 g/cm32.5-2.52 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

0.24 kJ/Kg K0.71 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant
Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Indonesia, Russia, Singapore, South Korea
China, Kazakhstan, South Korea, Thailand, Turkey, Vietnam

Africa

Cape Verde, Ethiopia, Ghana, South Africa, Western Africa
Egypt, Ethiopia, Ghana, South Africa

Europe

Albania, France, Germany, Great Britain, United Kingdom
Finland, France, Germany, Great Britain, Hungary, Iceland, Ireland, Italy, Netherlands, Norway, Romania, Sweden, Switzerland

Others

-
Greenland

Deposits in Western Continents

North America

Canada, USA
Canada, Cuba, Jamaica, USA

South America

Brazil, Colombia, Ecuador
Bolivia, Brazil, Colombia, Ecuador, Paraguay

Deposits in Oceania Continent

Australia

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

Gossan vs Porphyry Information

Earth’s outer layer is covered by rocks and these rocks have different physical and chemical properties. As two rocks are not same, it’s fun to compare them. You can also know more about Gossan and Porphyry Reserves. Gossan is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein.. Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix. These rocks are composed of many distinct minerals. The process of formation of rocks is different for various rocks. Rocks are quarried from many years for various purposes. You can check out Gossan vs Porphyry information and Gossan vs Porphyry characteristics in the upcoming sections.

Gossan vs Porphyry 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. Gossan vs Porphyry characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Gossan and Properties of Porphyry. Learn more about Gossan vs Porphyry in the next section. The interior uses of Gossan include Countertops, Decorative aggregates and Interior decoration whereas the interior uses of Porphyry include Decorative aggregates and Interior decoration. Due to some exceptional properties of Gossan and Porphyry, they have various applications in construction industry. The uses of Gossan in construction industry include As dimension stone, Cement manufacture, Construction aggregate, For road aggregate and that of Porphyry include Construction aggregate.

More about Gossan and Porphyry

Here you can know more about Gossan and Porphyry. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Gossan and Porphyry consists of mineral content and compound content. The mineral content of Gossan includes Apatite, Augite, Biotite, Bronzite, Calcite, Chert, Epidote, Feldspar, Hornblende, Micas, Plagioclase, Pyroxene, Quartz, Sulfides, Zircon and mineral content of Porphyry includes Biotite, Chert, Feldspar, Garnet, Graphite, Quartz, Silica. You can also check out the list of all Metamorphic Rocks. When we have to compare Gossan vs Porphyry, the texture, color and appearance plays an important role in determining the type of rock. Gossan is available in brown, brown- black, gold, green, rust colors whereas, Porphyry is available in black, brown, green, grey, red, rust, white colors. Appearance of Gossan is Dull and Banded and that of Porphyry is Dull. Properties of rock is another aspect for Gossan vs Porphyry. The hardness of Gossan is 4-5 and that of Porphyry is 6-7. The types of Gossan are Translocated gossan and Leakage gossan whereas types of Porphyry are Rhomb Porphyry. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Gossan is white to grey while that of Porphyry is white. The specific heat capacity of Gossan is 0.24 kJ/Kg K and that of Porphyry is 0.71 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Gossan is heat resistant, impact resistant, pressure resistant whereas Porphyry is heat resistant, impact resistant.