Trondhjemite

Tephrite

Trondhjemite and Tephrite

Trondhjemite

Tephrite

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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.

Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock

History

Origin

Tonale, Italy

Germany

Discoverer

Unknown

Van Tooren

Etymology

From Trondheim, Norway

From Greek tephra, ashes from Indo-European base, to burn

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Plutonic

Volcanic

Other Categories

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

Texture

Phaneritic

Aphanitic to Porphyritic

Color

Black, Brown, Light to Dark Grey, White

Black, Brown, Green, Grey, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Banded and Foilated

Vesicular

Uses

Architecture

Interior Uses

Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration

Decorative Aggregates, Flooring, 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

Other Architectural Uses

Curbing

Industry

Construction Industry

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

Landscaping

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Sculpture

Other Uses

Commercial Uses

Cemetery Markers, Creating Artwork

Production of Lime, Soil Conditioner

Types

Intermediate intrusive rock

Igneous rock

Features

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

Host Rock for Lead

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

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

Tephrite 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

Alkali feldspar, Nepheline, Plagioclase, Pyroxene

Compound Content

NaCl, CaO, MgO, Silicon Dioxide

CaO, Carbon Dioxide, MgO, Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

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

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

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

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

Properties

Physical Properties

Hardness

6-76.5

1 7

👆🏻

Grain Size

Medium to Fine Coarse Grained

Fracture

Conchoidal

Uneven

Streak

Bluish Black

Porosity

Very Less Porous

Luster

Subvitreous to Dull

Compressive Strength

130.00 N/mm²90.00 N/mm²

0.15 450

👆🏻

Cleavage

Crenulation and Pervasive

Toughness

2.1

2.4

Specific Gravity

2.86-32.86

0 8.4

👆🏻

Transparency

Opaque

Density

2.73 g/cm³2.8-2.9 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

Africa

Egypt

Namibia, Uganda

Europe

Finland, Germany, Italy, Romania, Sweden, Turkey

Germany, Hungary, Italy, Portugal, Spain

Others

Deposits in Western Continents

North America

USA

South America

Argentina, Bolivia, Chile, Colombia, Ecuador, Peru

Deposits in Oceania Continent

Australia

New Zealand, South Australia, Western Australia

New Zealand, Western Australia

All about Trondhjemite and Tephrite Properties

Know all about Trondhjemite and Tephrite properties here. All properties of rocks are important as they define the type of rock and its application. Trondhjemite and Tephrite belong to Igneous Rocks.Texture of Trondhjemite is Phaneritic whereas that of Tephrite is Aphanitic to Porphyritic. Trondhjemite appears Banded and Foilated and Tephrite appears Vesicular. The luster of Trondhjemite and Tephrite is subvitreous to dull. Trondhjemite is available in black, brown, light to dark grey, white colors whereas Tephrite is available in black, brown, green, grey, white colors. The commercial uses of Trondhjemite are cemetery markers, creating artwork and that of Tephrite are production of lime, soil conditioner.