Ignimbrite and Trondhjemite

Ignimbrite

Trondhjemite

Definition

Ignimbrite is a volcanic rock consisting mainly of pumice fragments, formed by the consolidation of material deposited by pyroclastic flows

Trondhjemite is a leucocratic (light-colored) intrusive igneous rock. It is a variety of tonalite in which the plagioclase is mostly in the form of oligoclase. Trondhjemites are sometimes known as plagiogranites.

History

Origin

New Zealand

Tonale, Italy

Discoverer

Patrick Marshall

Unknown

Etymology

From Latin ignis fire + imber, imbr- shower of rain, storm cloud + -ite

Not Available

Class

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Hard Rock

Family

Group

Volcanic

Plutonic

Other Categories

Fine Grained Rock, Opaque Rock

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

Texture

Aphanitic

Phaneritic

Color

Beige, Black, Brown, Grey, Pink, White

Black, Brown, Light to Dark Grey, White

Maintenance

Less

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Yes

Stain Resistant

Yes

Wind Resistant

Yes

Acid Resistant

Appearance

Dull, Vesicular and Foilated

Banded and Foilated

Uses

Architecture

Interior Uses

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration

Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration

Exterior Uses

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

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

Other Architectural Uses

Curbing

Industry

Construction Industry

Building houses or walls, Construction Aggregate

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

Medical Industry

Not Yet Used

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Cemetery Markers, Commemorative Tablets, Creating Artwork

Cemetery Markers, Creating Artwork

Types

Not Available

Features

Always found as volcanic pipes over deep continental crust

Is one of the oldest rock, Typically speckled black and white.

Archaeological Significance

Monuments

Used

Not Yet Used

Famous Monuments

Data Not Available

Not Applicable

Sculpture

Used

Famous Sculptures

Data Not Available

Pictographs

Used

Not Used

Petroglyphs

Used

Not Used

Figurines

Used

Fossils

Absent

Formation

Ignimbrites are formed from very poorly sorted mixture of volcanic ash or tuff and pumice lapilli, commonly with scattered lithic fragments.

When alkali feldspar is extracted from granite, it changes to granitoid and later, it becomes trondhjemite with quartz as major mineral.

Composition

Mineral Content

Apatite, Biotite, Calcite, Chlorite, Feldspar, Hematite, Hornblade, Ilmenite, Magnetite, Olivine, Pyroxene, Quartz

Albite, Amphibole, Apatite, Biotite, Feldspar, Hornblade, Ilmenite, Magnetite, Manganese Oxides, Olivine, Plagioclase, Pyroxene, Quartz, Sulfides, Titanite, Zircon

Compound Content

Ca, NaCl

NaCl, CaO, MgO, Silicon Dioxide

Transformation

Metamorphism

Yes

Types of Metamorphism

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

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

Weathering

Yes

Types of Weathering

Biological Weathering, Chemical Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

Yes

Types of Erosion

Chemical Erosion, Coastal Erosion

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

Properties

Physical Properties

Hardness

4-6

6-7

Grain Size

Fine Grained

Medium to Fine Coarse Grained

Fracture

Uneven

Conchoidal

Streak

White

Bluish Black

Porosity

Highly Porous

Very Less Porous

Luster

Vitreous to Dull

Subvitreous to Dull

Compressive Strength

243.80 N/mm²

Not Available

Cleavage

Not Available

Toughness

Not Available

2.1

Specific Gravity

2.73

2.86-3

Transparency

Opaque

Density

1-1.8 g/cm³

2.73 g/cm³

Thermal Properties

Specific Heat Capacity

0.20 kJ/Kg K

0.92 kJ/Kg K

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Heat 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

Not Yet Found

Africa

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

Egypt

Europe

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

Finland, Germany, Italy, Romania, Sweden, Turkey

Others

Antarctica, Hawaii Islands

Not Yet Found

Deposits in Western Continents

North America

Canada, Costa Rica, Panama, USA

USA

South America

Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador

Argentina, Bolivia, Chile, Colombia, Ecuador, Peru

Deposits in Oceania Continent

Australia

Central Australia, Western Australia

New Zealand, South Australia, Western Australia

Summary >>

<< Reserves

All about Ignimbrite and Trondhjemite Properties

Know all about Ignimbrite and Trondhjemite properties here. All properties of rocks are important as they define the type of rock and its application. Ignimbrite and Trondhjemite belong to Igneous Rocks.Texture of Ignimbrite is Aphanitic whereas that of Trondhjemite is Phaneritic. Ignimbrite appears Dull, Vesicular and Foilated and Trondhjemite appears Banded and Foilated. The luster of Ignimbrite is vitreous to dull while that of Trondhjemite is subvitreous to dull. Ignimbrite is available in beige, black, brown, grey, pink, white colors whereas Trondhjemite is available in black, brown, light to dark grey, white colors. The commercial uses of Ignimbrite and Trondhjemite are cemetery markers, commemorative tablets, creating artwork.