Trachyte

Gossan

Trachyte and Gossan

Trachyte

Gossan

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Definition

Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar

Gossan is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein.

History

Origin

Indonesia

Discoverer

Alexandre Brongniart and René Just Haüy

Cornish Gossen

Etymology

From Greek trakhus rough’ or trakhutēs roughness

From Cornish gossen from gos, blood from Old Cornish guit

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Rough, Sandy

Color

Black, Brown, Dark Greenish - Grey, Green, Grey, Light to Dark Grey, White

Brown, Brown- Black, Gold, Green, Rust

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Banded

Dull and Banded

Uses

Architecture

Interior Uses

Decorative Aggregates, Flooring, Homes, Interior Decoration

Countertops, Decorative Aggregates, Interior Decoration

Exterior Uses

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

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Manufacture of Magnesium and Dolomite Refractories

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

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts

Other Uses

Commercial Uses

Cemetery Markers, Creating Artwork

Cemetery Markers, Commemorative Tablets, Gemstone

Types

Felsic volcanic rock

Translocated gossan and Leakage gossan

Features

Available in Lots of Colors and Patterns, Is one of the oldest rock, Matrix variable

Clasts are smooth to touch, Easily splits into thin plates

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Trachyte is an igneous volcanic rock with an aphanitic to porphyritic texture. It is the volcanic equivalent of syenite rock and forms as a result of magmatic differentiation.

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

Composition

Mineral Content

Augite, Biotite, Feldspar, Hornblade, Plagioclase, Quartz

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

Compound Content

Potassium Oxide, Sodium Oxide, Silicon Dioxide

Aluminium Oxide, CaO, Fe, FeO, Silicon Dioxide, Sulphur

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

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

Chemical Erosion, Sea Erosion, Wind Erosion

Properties

Physical Properties

Hardness

64-5

1 7

👆🏻

Grain Size

Fine Grained

Fine to Medium Grained

Fracture

Conchoidal

Streak

White

White to Grey

Porosity

Less Porous

Highly Porous

Luster

Metallic

Compressive Strength

150.00 N/mm²-

0.15 450

👆🏻

Cleavage

Toughness

Specific Gravity

2.72.0

0 8.4

👆🏻

Transparency

Opaque

Density

2.43-2.45 g/cm³-9999 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.84 kJ/Kg K0.24 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Wear Resistant

Heat Resistant, Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Iran, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Vietnam

China, India, Indonesia, Russia, Singapore, South Korea

Africa

Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa

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

Europe

Bulgaria, England, Germany, Norway, Romania, Switzerland

Albania, France, Germany, Great Britain, United Kingdom

Others

Deposits in Western Continents

North America

USA

Canada, USA

South America

Brazil, Chile

Brazil, Colombia, Ecuador

Deposits in Oceania Continent

Australia

New Zealand, Queensland, South Australia, Western Australia

New South Wales, South Australia, Western Australia

All about Trachyte and Gossan Properties

Know all about Trachyte and Gossan properties here. All properties of rocks are important as they define the type of rock and its application. Trachyte belongs to Igneous Rocks while Gossan belongs to Metamorphic Rocks.Texture of Trachyte is Aphanitic to Porphyritic whereas that of Gossan is Rough, Sandy. Trachyte appears Banded and Gossan appears Dull and Banded. The luster of Trachyte and Gossan is metallic. Trachyte is available in black, brown, dark greenish - grey, green, grey, light to dark grey, white colors whereas Gossan is available in brown, brown- black, gold, green, rust colors. The commercial uses of Trachyte are cemetery markers, creating artwork and that of Gossan are cemetery markers, commemorative tablets, gemstone.