×

Tephrite
Tephrite

Hornfels
Hornfels



ADD
Compare
X
Tephrite
X
Hornfels

Tephrite and Hornfels

Add ⊕
1 Definition
1.1 Definition
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
Hornfels is a metamorphic rock formed by the contact between mudstone or other clay rich rock, and a hot igneous body, and represents a heat altered equivalent of the original rock
1.2 History
1.2.1 Origin
Germany
New Zealand
1.3.1 Discoverer
Van Tooren
Unknown
1.4 Etymology
From Greek tephra, ashes from Indo-European base, to burn
From German which means hornstone
1.5 Class
Igneous Rocks
Metamorphic Rocks
1.5.1 Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
1.6 Family
1.6.1 Group
Volcanic
Not Applicable
1.7 Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock
2 Texture
2.1 Texture
Aphanitic to Porphyritic
Granular, Platy
2.2 Color
Black, Brown, Colourless, Green, Grey, White
Brown, Dark Greenish - Grey, Green, Reddish Brown
2.3 Maintenance
Less
Less
2.4 Durability
Durable
Durable
2.4.1 Water Resistant
2.4.2 Scratch Resistant
2.4.3 Stain Resistant
2.4.4 Wind Resistant
2.4.5 Acid Resistant
2.5 Appearance
Vesicular
Dull
3 Uses
3.1 Architecture
3.1.1 Interior Uses
Decorative Aggregates, Flooring, Homes, Interior Decoration
Decorative Aggregates, Flooring, Homes, Interior Decoration
3.1.2 Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
3.1.3 Other Architectural Uses
Curbing
Curbing
3.2 Industry
3.2.1 Construction Industry
Landscaping
for Road Aggregate, Roadstone
3.2.2 Medical Industry
Not Yet Used
Not Yet Used
3.3 Antiquity Uses
Artifacts, Sculpture
Artifacts, Monuments
3.4 Other Uses
3.4.1 Commercial Uses
Production of Lime, Soil Conditioner
Cemetery Markers, Commemorative Tablets, Creating Artwork
4 Types
4.1 Types
Not Available
Biotite hornfels
4.2 Features
Host Rock for Lead
Smooth to touch
4.3 Archaeological Significance
4.3.1 Monuments
Not Yet Used
Used
4.3.2 Famous Monuments
Not Applicable
Data Not Available
4.3.3 Sculpture
Used
Not Yet Used
4.3.4 Famous Sculptures
Data Not Available
Not Applicable
4.3.5 Pictographs
Not Used
Used
4.3.6 Petroglyphs
Not Used
Used
4.3.7 Figurines
Used
Not Yet Used
4.4 Fossils
Absent
Absent
5 Formation
5.1 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.
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Hornfels is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.
5.2 Composition
5.2.1 Mineral Content
Alkali feldspar, Nepheline, Plagioclase, Pyroxene
Andalusite
5.2.2 Compound Content
CaO, Carbon Dioxide, MgO, Silicon Dioxide
Fe, Mg
5.3 Transformation
5.3.1 Metamorphism
5.3.2 Types of Metamorphism
Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism
Not Applicable
5.3.3 Weathering
5.3.4 Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Biological Weathering
5.3.5 Erosion
5.3.6 Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion
Chemical Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion
6 Properties
6.1 Physical Properties
6.1.1 Hardness
6.52-3
Coal
1 7
6.1.2 Grain Size
Medium to Fine Coarse Grained
Fine Grained
6.1.3 Fracture
Uneven
Conchoidal
6.1.4 Streak
Bluish Black
Unknown
6.1.5 Porosity
Very Less Porous
Highly Porous
6.1.6 Luster
Subvitreous to Dull
Shiny
6.1.7 Compressive Strength
90.00 N/mm25.80 N/mm2
What Is Obsidian
0.15 450
6.1.8 Cleavage
Crenulation and Pervasive
Perfect
6.1.9 Toughness
2.4
Not Yet Found
6.1.10 Specific Gravity
2.863.4-3.9
Granite
0 8.4
6.1.11 Transparency
Opaque
Opaque
6.1.12 Density
2.8-2.9 g/cm30.25-0.30 g/cm3
Granite
0 1400
6.2 Thermal Properties
6.2.1 Specific Heat Capacity
0.92 kJ/Kg K0.84 kJ/Kg K
What Is Granulite
0.14 3.2
6.2.2 Resistance
Heat Resistant, Impact Resistant
Heat Resistant, Impact Resistant, Pressure Resistant
7 Reserves
7.1 Deposits in Eastern Continents
7.1.1 Asia
Not Yet Found
Bangladesh, Bhutan, China, India, North Korea, Qatar, Russia, Saudi Arabia, South Korea, Thailand
7.1.2 Africa
Namibia, Uganda
Cameroon, East Africa, Tanzania, Western Africa
7.1.3 Europe
Germany, Hungary, Italy, Portugal, Spain
United Kingdom
7.1.4 Others
Not Yet Found
Not Yet Found
7.2 Deposits in Western Continents
7.2.1 North America
USA
Canada, USA
7.2.2 South America
Not Yet Found
Bolivia, Brazil, Colombia, Ecuador
7.3 Deposits in Oceania Continent
7.3.1 Australia
New Zealand, Western Australia
New South Wales, New Zealand, Queensland, Western Australia

All about Tephrite and Hornfels Properties

Know all about Tephrite and Hornfels properties here. All properties of rocks are important as they define the type of rock and its application. Tephrite belongs to Igneous Rocks while Hornfels belongs to Metamorphic Rocks.Texture of Tephrite is Aphanitic to Porphyritic whereas that of Hornfels is Granular, Platy. Tephrite appears Vesicular and Hornfels appears Dull. The luster of Tephrite is subvitreous to dull while that of Hornfels is shiny. Tephrite is available in black, brown, colourless, green, grey, white colors whereas Hornfels is available in brown, dark greenish - grey, green, reddish brown colors. The commercial uses of Tephrite are production of lime, soil conditioner and that of Hornfels are cemetery markers, commemorative tablets, creating artwork.