Tachylite

Gossan

Tachylite and Gossan

Tachylite

Gossan

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Definition

Tachylite is a vitreous form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt

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

History

Origin

Iceland

Indonesia

Discoverer

Unknown

Cornish Gossen

Etymology

From German Tachylite, from tachy- + Greek lutos soluble, melting

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

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

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Vitreous

Rough, Sandy

Color

Black, Dark Brown

Brown, Brown- Black, Gold, Green, Rust

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Glassy

Dull and Banded

Uses

Architecture

Interior Uses

Decorative Aggregates, Interior Decoration

Countertops, Decorative Aggregates, Interior Decoration

Exterior Uses

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

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

Other Architectural Uses

Curbing

Industry

Construction Industry

Cutting Tool, Knives, Landscaping, Scrapers

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

Medical Industry

Antiquity Uses

Artifacts

Other Uses

Commercial Uses

Cemetery Markers, Creating Artwork

Cemetery Markers, Commemorative Tablets, Gemstone

Types

Volcanic glass

Translocated gossan and Leakage gossan

Features

Available in Lots of Colors and Patterns, Clasts are smooth to touch

Clasts are smooth to touch, Easily splits into thin plates

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Tachylite 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.

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

Feldspar, Olivine

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

Compound Content

Fe, Mg

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

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, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion

Chemical Erosion, Sea Erosion, Wind Erosion

Properties

Physical Properties

Hardness

5.54-5

1 7

👆🏻

Grain Size

Medium to Fine Coarse Grained

Fine to Medium Grained

Fracture

Conchoidal

Streak

Vermilion

White to Grey

Porosity

Less Porous

Highly Porous

Luster

Resinous

Metallic

Compressive Strength

206.00 N/mm²-

0.15 450

👆🏻

Cleavage

Toughness

Specific Gravity

2.42.0

0 8.4

👆🏻

Transparency

Opaque

Density

3.058 g/cm³-9999 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.56 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

Cambodia, Russia, South Korea

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

Africa

East Africa

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

Europe

England, Germany, Hungary, Iceland, Scotland, Sweden

Albania, France, Germany, Great Britain, United Kingdom

Others

Hawaii Islands

Deposits in Western Continents

North America

USA

Canada, USA

South America

Brazil, Colombia, Ecuador

Deposits in Oceania Continent

Australia

Victoria

New South Wales, South Australia, Western Australia

All about Tachylite and Gossan Properties

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