Gossan

Blueschist

Gossan and Blueschist

Gossan

Blueschist

Add ⊕

Definition

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

Blueschist is a metamorphic rock which is generally blue in color and is formed under conditions of high pressure and low temperature

History

Origin

Indonesia

USA

Discoverer

Cornish Gossen

Edgar Bailey

Etymology

From Cornish gossen from gos, blood from Old Cornish guit

From French schiste, Greek skhistos i.e. split

Class

Metamorphic Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Other Categories

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Rough, Sandy

Foliated

Color

Brown, Brown- Black, Gold, Green, Rust

Blue, Bluish - Grey, Purple, Shades of Blue

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Banded

Uses

Architecture

Interior Uses

Countertops, Decorative Aggregates, Interior Decoration

Floor Tiles, Flooring, Homes, Hotels, Kitchens

Exterior Uses

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

Garden Decoration, Office Buildings

Other Architectural Uses

Curbing

Industry

Construction Industry

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

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

Medical Industry

Antiquity Uses

Artifacts

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

Cemetery Markers, Commemorative Tablets, Gemstone

Cemetery Markers, Commemorative Tablets, Creating Artwork, Curling, Tombstones

Types

Translocated gossan and Leakage gossan

Metamorphic rock

Features

Clasts are smooth to touch, Easily splits into thin plates

Has High structural resistance against erosion and climate, Very fine grained rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

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

Blueschist forms due to the metamorphism of basalt and other rocks with similar composition at high pressures and low temperatures and approximately corresponding to a depth of 15 to 30 kilometers and 200 to 500 °C.

Composition

Mineral Content

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

Albite, Chlorite, Epidote, Garnet, Glaucophane, Lawsonite, Muscovite or Illite, Quartz

Compound Content

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

Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Weathering

✔ ✘

Types of Weathering

Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Sea Erosion, Wind Erosion

Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

4-53.5-4

1 7

👆🏻

Grain Size

Fine to Medium Grained

Fracture

Conchoidal

Streak

White to Grey

Porosity

Highly Porous

Luster

Metallic

Dull

Compressive Strength

-220.00 N/mm²

0.15 450

👆🏻

Cleavage

Slaty

Toughness

1.5

Specific Gravity

2.03-3.2

0 8.4

👆🏻

Transparency

Opaque

Density

-9999 g/cm³2.8-2.9 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.24 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant

Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

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

Japan, Turkey

Africa

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

Egypt, Ethiopia, South Africa

Europe

Albania, France, Germany, Great Britain, United Kingdom

France, Greece, Iceland

Others

Deposits in Western Continents

North America

Canada, USA

USA

South America

Brazil, Colombia, Ecuador

Deposits in Oceania Continent

Australia

New South Wales, South Australia, Western Australia

New Zealand

All about Gossan and Blueschist Properties

Know all about Gossan and Blueschist properties here. All properties of rocks are important as they define the type of rock and its application. Gossan and Blueschist belong to Metamorphic Rocks.Texture of Gossan is Rough, Sandy whereas that of Blueschist is Foliated. Gossan appears Dull and Banded and Blueschist appears Dull and Banded. The luster of Gossan is metallic while that of Blueschist is dull. Gossan is available in brown, brown- black, gold, green, rust colors whereas Blueschist is available in blue, bluish - grey, purple, shades of blue colors. The commercial uses of Gossan are cemetery markers, commemorative tablets, gemstone and that of Blueschist are cemetery markers, commemorative tablets, creating artwork, curling, tombstones.