Basanite

Tuff

Basanite and Tuff

Basanite

Tuff

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Definition

Basanite is a black basaltic rock which mainly contains plagioclase, augite, olivine and nepheline and is formerly used as a touchstone

Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption

History

Origin

Italy

Discoverer

Unknown

Etymology

From Latin basanites + -ite

From a Latin word tophous then in Italian tufo and finally tuff

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Clastic, Pyroclastic

Color

Black, Brown, Green, Grey, Red, White

Brown, Grey, Yellow

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

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Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Glassy or Pearly

Dull, Vesicular and Foilated

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes

Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration

Exterior Uses

As Building Stone, Garden Decoration, Office Buildings

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

Other Architectural Uses

Whetstones

Curbing

Industry

Construction Industry

Arrowheads, Construction Aggregate, Cutting Tool, Spear Points

Building houses or walls, Construction Aggregate

Medical Industry

Antiquity Uses

Artifacts, Monuments

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

As a touchstone, Creating Artwork, Gemstone, In fire-starting tools, Manufacture of tools, Metallurgical Flux, Jewelry, To ignite fire, Used in flintlock firearms

Creating Artwork

Types

Nepheline-Basanite, Analcite-Basanite and Leucite-Basanite

Welded tuff, Rhyolitic tuff, Basaltic tuff, Trachyte tuff, Andesitic tuff and Ignimbrite.

Features

Clasts are smooth to touch, Easily splits into thin plates, Has High structural resistance against erosion and climate, Used as a touchstone

Always found as volcanic pipes over deep continental crust

Archaeological Significance

Monuments

Famous Monuments

Easter Island in the Polynesian Triangle, Pacific Ocean

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Basanite is a fine-grained, hard rock that forms when bits of lava shoot out of volcanoes.

Tuff is formed when large masses of ash and sand which are mixed with hot gases are ejected by a volcano and avalanche rapidly down its slopes.

Composition

Mineral Content

Augite, Feldspar, Ilmenite, Olivine, Plagioclase

Calcite, Chlorite

Compound Content

Potassium Oxide, Sodium Oxide, Silicon Dioxide

Hydrogen Sulfide, Sulfur Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism

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

Weathering

✔ ✘

Types of Weathering

Chemical Weathering, Mechanical Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

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

Properties

Physical Properties

Hardness

74-6

1 7

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Grain Size

Fine Grained

Fracture

Uneven, Splintery or Conchoidal

Uneven

Streak

White

Porosity

Highly Porous

Luster

Waxy and Dull

Vitreous to Dull

Compressive Strength

100.00 N/mm²243.80 N/mm²

0.15 450

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Cleavage

Toughness

1.5

Specific Gravity

2.5-2.82.73

0 8.4

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Transparency

Translucent to Opaque

Opaque

Density

2.7 g/cm³1-1.8 g/cm³

0 1400

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Thermal Properties

Specific Heat Capacity

0.74 kJ/Kg K0.20 kJ/Kg K

0.14 3.2

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Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Afghanistan, Armenia, Azerbaijan, Burma, Cambodia, China, India, Indonesia, Iran, Japan, Malaysia, Mongolia, Nepal, North Korea, Pakistan, Saudi Arabia, Syria, Taiwan, Thailand, Turkey, Vietnam, Yemen

Africa

Uganda

Cameroon, Cape Verde, Eritrea, Ethiopia, Kenya, Libya, Madagascar, Nigeria, Rwanda, South Africa, Sudan, Uganda

Europe

Germany, Hungary, Italy, Spain

France, Georgia, Germany, Greece, Iceland, Italy, Netherlands, Poland, Portugal, Spain, United Kingdom

Others

Greenland, Mid-Atlantic Ridge

Antarctica, Hawaii Islands

Deposits in Western Continents

North America

USA

Canada, Costa Rica, Panama, USA

South America

Bolivia, Brazil

Argentina, Bolivia, Brazil, Chile, Ecuador, Paraguay

Deposits in Oceania Continent

Australia

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

Central Australia, Western Australia

All about Basanite and Tuff Properties

Know all about Basanite and Tuff properties here. All properties of rocks are important as they define the type of rock and its application. Basanite and Tuff belong to Igneous Rocks.Texture of Basanite is Aphanitic to Porphyritic whereas that of Tuff is Clastic, Pyroclastic. Basanite appears Glassy or Pearly and Tuff appears Dull, Vesicular and Foilated. The luster of Basanite is waxy and dull while that of Tuff is vitreous to dull. Basanite is available in black, brown, green, grey, red, white colors whereas Tuff is available in brown, grey, yellow colors. The commercial uses of Basanite and Tuff are as a touchstone, creating artwork, gemstone, in fire-starting tools, manufacture of tools, metallurgical flux, jewelry, to ignite fire, used in flintlock firearms.