Trondhjemite and Harzburgite

Trondhjemite

Harzburgite

Definition

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.

Harzburgite is a plutonic rock of the peridotite group consisting largely of orthopyroxene and olivine

History

Origin

Tonale, Italy

Germany

Discoverer

Unknown

Etymology

Not Available

From the name of a town in Harzburg, Germany

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

Family

Group

Plutonic

Other Categories

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

Coarse Grained Rock, Opaque Rock

Texture

Phaneritic

Color

Black, Brown, Light to Dark Grey, White

Dark Greenish - Grey

Maintenance

Less

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Yes

Stain Resistant

Yes

Wind Resistant

Yes

Acid Resistant

Appearance

Banded and Foilated

Rough and Shiny

Uses

Architecture

Interior Uses

Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration

Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

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

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

Other Architectural Uses

Curbing

Industry

Construction Industry

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

As Dimension Stone, Cobblestones

Medical Industry

Not Yet Used

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Cemetery Markers, Creating Artwork

Creating Artwork, Gemstone, Jewelry, Source of Chromite, Platinum, Nickel and Garnet, Source of Diamonds

Types

Not Available

Features

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

Constitutes upper part of the Earth's mantle, Generally rough to touch, Is one of the oldest rock

Archaeological Significance

Monuments

Not Yet Used

Used

Famous Monuments

Not Applicable

Data Not Available

Sculpture

Used

Famous Sculptures

Data Not Available

Pictographs

Not Used

Used

Petroglyphs

Not Used

Used

Figurines

Used

Fossils

Absent

Formation

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

Harzburgite 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.

Composition

Mineral Content

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

Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene

Compound Content

NaCl, CaO, MgO, Silicon Dioxide

Ca, Fe, Mg, Potassium, Silicon Dioxide, Sodium, Titanium Dioxide

Transformation

Metamorphism

Yes

Types of Metamorphism

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

Impact Metamorphism

Weathering

Yes

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Chemical Weathering, Mechanical Weathering

Erosion

Yes

Types of Erosion

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

Chemical Erosion, Sea Erosion

Properties

Physical Properties

Hardness

6-7

5.5-6

Grain Size

Medium to Fine Coarse Grained

Coarse Grained

Fracture

Conchoidal

Irregular

Streak

Bluish Black

White

Porosity

Very Less Porous

Less Porous

Luster

Subvitreous to Dull

Shiny

Cleavage

Not Available

Imperfect

Toughness

2.1

Specific Gravity

2.86-3

3-3.01

Transparency

Opaque

Translucent to Opaque

Density

2.73 g/cm³

3.1-3.4 g/cm³

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K

1.25 kJ/Kg K

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

Not Yet Found

Japan, Oman

Africa

Egypt

South Africa

Europe

Finland, Germany, Italy, Romania, Sweden, Turkey

France, Germany, Italy, Venezuela

Others

Not Yet Found

Hawaii Islands, Mid-Atlantic Ridge

Deposits in Western Continents

North America

USA

Canada, USA

South America

Argentina, Bolivia, Chile, Colombia, Ecuador, Peru

Not Yet Found

Deposits in Oceania Continent

Australia

New Zealand, South Australia, Western Australia

Not Yet Found

Summary >>

<< Reserves

All about Trondhjemite and Harzburgite Properties

Know all about Trondhjemite and Harzburgite properties here. All properties of rocks are important as they define the type of rock and its application. Trondhjemite and Harzburgite belong to Igneous Rocks.Texture of Trondhjemite is Phaneritic whereas that of Harzburgite is Phaneritic. Trondhjemite appears Banded and Foilated and Harzburgite appears Rough and Shiny. The luster of Trondhjemite is subvitreous to dull while that of Harzburgite is shiny. Trondhjemite is available in black, brown, light to dark grey, white colors whereas Harzburgite is available in dark greenish - grey colors. The commercial uses of Trondhjemite are cemetery markers, creating artwork and that of Harzburgite are creating artwork, gemstone, jewelry, source of chromite, platinum, nickel and garnet, source of diamonds.