1 Definition
1.1 Definition
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
1.2 History
1.2.1 Origin
Germany
1.2.2 Discoverer
Van Tooren
1.3 Etymology
From Greek tephra, ashes from Indo-European base, to burn
1.4 Class
Igneous Rocks
1.4.1 Sub-Class
Durable Rock, Hard Rock
1.5 Family
1.5.1 Group
Volcanic
1.6 Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
2 Texture
2.1 Texture
Aphanitic to Porphyritic
2.2 Color
Black, Brown, Colourless, Green, Grey, White
2.3 Maintenance
Less
2.4 Durability
Durable
2.4.1 Water Resistant
✔
✘
81% - Igneous Rocks Rocks have it !
▶
2.4.2 Scratch Resistant
✔
✘
86% - Igneous Rocks Rocks have it !
▶
2.4.3 Stain Resistant
✔
✘
66% - Igneous Rocks Rocks have it !
▶
2.4.4 Wind Resistant
✔
✘
49% - Igneous Rocks Rocks have it !
▶
2.4.5 Acid Resistant
✔
✘
48% - Igneous Rocks Rocks have it !
▶
2.5 Appearance
Vesicular
3 Uses
3.1 Architecture
3.1.1 Interior Uses
Decorative Aggregates, Flooring, Homes, Interior Decoration
3.1.2 Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings
3.1.3 Other Architectural Uses
Curbing
3.2 Industry
3.2.1 Construction Industry
Landscaping
3.2.2 Medical Industry
Not Yet Used
3.3 Antiquity Uses
Artifacts, Sculpture
3.4 Other Uses
3.4.1 Commercial Uses
Production of Lime, Soil Conditioner
4 Types
4.1 Types
Not Available
4.2 Features
Host Rock for Lead
4.3 Archaeological Significance
4.3.1 Monuments
Not Yet Used
4.3.2 Famous Monuments
Not Applicable
4.3.3 Sculpture
Used
4.3.4 Famous Sculptures
Data Not Available
4.3.5 Pictographs
Not Used
4.3.6 Petroglyphs
Not Used
4.3.7 Figurines
Used
4.4 Fossils
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.
5.2 Composition
5.2.1 Mineral Content
Alkali feldspar, Nepheline, Plagioclase, Pyroxene
5.2.2 Compound Content
CaO, Carbon Dioxide, MgO, Silicon Dioxide
5.3 Transformation
5.3.1 Metamorphism
✔
✘
97% - Igneous Rocks Rocks have it !
▶
5.3.2 Types of Metamorphism
Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism
5.3.3 Weathering
✔
✘
99% - Igneous Rocks Rocks have it !
▶
5.3.4 Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
5.3.5 Erosion
✔
✘
92% - Igneous Rocks Rocks have it !
▶
5.3.6 Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion
6 Properties
6.1 Physical Properties
6.1.1 Hardness
6.1.2 Grain Size
Medium to Fine Coarse Grained
6.1.3 Fracture
Uneven
6.1.4 Streak
Bluish Black
6.1.5 Porosity
Very Less Porous
6.1.6 Luster
Subvitreous to Dull
6.1.7 Compressive Strength
90.00 N/mm2
Rank: 22 (Overall) ▶
0.15
450
6.1.8 Cleavage
Crenulation and Pervasive
6.1.9 Toughness
2.4
6.1.10 Specific Gravity
6.1.11 Transparency
Opaque
6.1.12 Density
6.2 Thermal Properties
6.2.1 Specific Heat Capacity
0.92 kJ/Kg K
Rank: 10 (Overall) ▶
0.14
3.2
6.2.2 Resistance
Heat Resistant, Impact Resistant
7 Reserves
7.1 Deposits in Eastern Continents
7.1.1 Asia
Not Yet Found
7.1.2 Africa
Namibia, Uganda
7.1.3 Europe
Germany, Hungary, Italy, Portugal, Spain
7.1.4 Others
Not Yet Found
7.2 Deposits in Western Continents
7.2.1 North America
USA
7.2.2 South America
Not Yet Found
7.3 Deposits in Oceania Continent
7.3.1 Australia
New Zealand, Western Australia