Tuff

Lamprophyre

Tuff and Lamprophyre

Tuff

Lamprophyre

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Definition

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

Lamprophyre is uncommon igneous rocks primarily occurring as dikes, lopoliths, laccoliths, stocks and small intrusions

History

Origin

Italy

Discoverer

Unknown

Etymology

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

From Greek lampros bright and shining + porphureos purple

Class

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Plutonic

Other Categories

Fine Grained Rock, Opaque Rock

Coarse Grained Rock, Fine Grained Rock, Opaque Rock

Texture

Clastic, Pyroclastic

Porphyritic

Color

Brown, Grey, Yellow

Black, Bluish - Grey, Brown, Dark Greenish - Grey, Green, Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull, Vesicular and Foilated

Dull, Banded and Foilated

Uses

Architecture

Interior Uses

Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration

Decorative Aggregates, Interior Decoration

Exterior Uses

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

As Building Stone, Office Buildings

Other Architectural Uses

Curbing

Industry

Construction Industry

Building houses or walls, Construction Aggregate

As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement, Manufacture of Magnesium and Dolomite Refractories

Medical Industry

Taken as a Supplement for Calcium or Magnesium

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

Creating Artwork

An Oil and Gas Reservoir, As a Feed Additive for Livestock, Gemstone, Metallurgical Flux, Production of Lime, Soil Conditioner, Source of Magnesia (MgO)

Types

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

Minette, Alnoite, Camptonite, Monchiquite, Fourchite, Vogesite, Appinite and Spessartite

Features

Always found as volcanic pipes over deep continental crust

Always found as volcanic pipes over deep continental crust, Host rock for Diamond, Is one of the oldest rock, Surfaces are often shiny

Archaeological Significance

Monuments

Famous Monuments

Easter Island in the Polynesian Triangle, Pacific Ocean

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

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.

Lamprophyre formation takes place deep beneath the Earth’s surface at around 150 to 450 kilometres, and are erupted rapidly and violently.

Composition

Mineral Content

Calcite, Chlorite

Amphibole, Carbonate, Garnet, Micas, Olivine, Phlogopite, Pyroxene

Compound Content

Hydrogen Sulfide, Sulfur Dioxide

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

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

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

Cataclastic Metamorphism, Impact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering

Erosion

✔ ✘

Types of Erosion

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

Chemical Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

4-65-6

1 7

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Grain Size

Fine Grained

Fine to Coarse Grained

Fracture

Uneven

Conchoidal

Streak

White

Porosity

Highly Porous

Very Less Porous

Luster

Vitreous to Dull

Subvitreous to Dull

Compressive Strength

243.80 N/mm²120.00 N/mm²

0.15 450

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Cleavage

Conchoidal

Toughness

Specific Gravity

2.732.86-2.87

0 8.4

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Transparency

Opaque

Translucent to Opaque

Density

1-1.8 g/cm³2.95-2.96 g/cm³

0 1400

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Thermal Properties

Specific Heat Capacity

0.20 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Impact 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

Russia

Africa

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

Angola, Botswana, Cameroon, Ethiopia, South Africa

Europe

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

England, Hungary, Iceland, United Kingdom

Others

Antarctica, Hawaii Islands

Antarctica, Greenland

Deposits in Western Continents

North America

Canada, Costa Rica, Panama, USA

Canada, Mexico, USA

South America

Argentina, Bolivia, Brazil, Chile, Ecuador, Paraguay

Argentina, Colombia, Ecuador

Deposits in Oceania Continent

Australia

Central Australia, Western Australia

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

All about Tuff and Lamprophyre Properties

Know all about Tuff and Lamprophyre properties here. All properties of rocks are important as they define the type of rock and its application. Tuff and Lamprophyre belong to Igneous Rocks.Texture of Tuff is Clastic, Pyroclastic whereas that of Lamprophyre is Porphyritic. Tuff appears Dull, Vesicular and Foilated and Lamprophyre appears Dull, Banded and Foilated. The luster of Tuff is vitreous to dull while that of Lamprophyre is subvitreous to dull. Tuff is available in brown, grey, yellow colors whereas Lamprophyre is available in black, bluish - grey, brown, dark greenish - grey, green, grey colors. The commercial uses of Tuff are creating artwork and that of Lamprophyre are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo).