Tephrite and Phyllite

Tephrite

Phyllite

Definition

Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock

Phyllite is a fine-grained metamorphic rock with a well-developed laminar structure, and is intermediate between slate and schist rocks

History

Origin

Germany

Unknown

Discoverer

Van Tooren

Unknown

Etymology

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

From Greek phullon leaf + -ite1

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Soft Rock

Family

Group

Volcanic

Not Applicable

Other Categories

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

Texture

Aphanitic to Porphyritic

Phyllitic Sheen, Slaty

Color

Black, Brown, Colourless, Green, Grey, White

Black to Grey, Light Greenish Grey

Maintenance

Less

Durability

Durable

Water Resistant

Yes

Scratch Resistant

Yes

Stain Resistant

Wind Resistant

Yes

Acid Resistant

Appearance

Vesicular

Crinkled or Wavy

Uses

Architecture

Interior Uses

Decorative Aggregates, Flooring, Homes, Interior Decoration

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration

Exterior Uses

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

As Building Stone, As Facing Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

Landscaping

As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Raw material for the manufacture of mortar, Roadstone

Medical Industry

Not Yet Used

Antiquity Uses

Artifacts, Sculpture

Other Uses

Commercial Uses

Production of Lime, Soil Conditioner

Cemetery Markers, Commemorative Tablets, Creating Artwork, Writing Slates

Types

Not Available

Features

Host Rock for Lead

Easily splits into thin plates, Is one of the oldest rock, Surfaces are often shiny

Archaeological Significance

Monuments

Not Yet Used

Famous Monuments

Not Applicable

Sculpture

Used

Famous Sculptures

Data Not Available

Pictographs

Not Used

Used

Petroglyphs

Not Used

Used

Figurines

Used

Fossils

Absent

Formation

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.

Phyllite is a metamorphic rock which is formed by regional metamorphism of argillaceous sediments since their cleavage arose due to deviatoric stress.

Composition

Mineral Content

Alkali feldspar, Nepheline, Plagioclase, Pyroxene

Albite, Alusite, Amphibole, Apatite, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc, Zircon

Compound Content

CaO, Carbon Dioxide, MgO, Silicon Dioxide

CaO, Carbon Dioxide, MgO

Transformation

Metamorphism

Yes

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

Not Applicable

Weathering

Yes

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

Yes

Types of Erosion

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

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

Properties

Physical Properties

Hardness

6.5

1-2

Grain Size

Medium to Fine Coarse Grained

Fracture

Uneven

Conchoidal

Streak

Bluish Black

White

Porosity

Very Less Porous

Highly Porous

Luster

Subvitreous to Dull

Phyllitic

Compressive Strength

90.00 N/mm²

Not Available

Cleavage

Crenulation and Pervasive

Toughness

2.4

1.2

Specific Gravity

2.86

2.72-2.73

Transparency

Opaque

Density

2.8-2.9 g/cm³

2.18-3.3 g/cm³

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K

Not Available

Resistance

Heat Resistant, Impact Resistant

Heat Resistant, Pressure Resistant, Water Resistant

Reserves

Deposits in Eastern Continents

Asia

Not Yet Found

Afghanistan, Bangladesh, Bhutan, China, India, Japan, Kazakhstan, Malaysia, Pakistan, Russia, Thailand, Turkey, Vietnam

Africa

Namibia, Uganda

Egypt, Ethiopia, Morocco, Nigeria, South Africa

Europe

Germany, Hungary, Italy, Portugal, Spain

Austria, England, France, Georgia, Germany, Italy, Liechtenstein, Monaco, Norway, Slovenia, Spain, Sweden, Switzerland

Others

Not Yet Found

Deposits in Western Continents

North America

USA

Canada, Costa Rica, Cuba, Mexico, Panama, USA

South America

Not Yet Found

Brazil, Colombia, Guyana

Deposits in Oceania Continent

Australia

New Zealand, Western Australia

New South Wales, New Zealand, Queensland

Summary >>

<< Reserves

All about Tephrite and Phyllite Properties

Know all about Tephrite and Phyllite properties here. All properties of rocks are important as they define the type of rock and its application. Tephrite belongs to Igneous Rocks while Phyllite belongs to Metamorphic Rocks.Texture of Tephrite is Aphanitic to Porphyritic whereas that of Phyllite is Phyllitic Sheen, Slaty. Tephrite appears Vesicular and Phyllite appears Crinkled or Wavy. The luster of Tephrite is subvitreous to dull while that of Phyllite is phyllitic. Tephrite is available in black, brown, colourless, green, grey, white colors whereas Phyllite is available in black to grey, light greenish grey colors. The commercial uses of Tephrite are production of lime, soil conditioner and that of Phyllite are cemetery markers, commemorative tablets, creating artwork, writing slates.