Definition
Definition
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
History
Origin
Germany
Discoverer
Van Tooren
Etymology
From Greek tephra, ashes from Indo-European base, to burn
Class
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Family
Group
Volcanic
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Texture
Texture
Aphanitic to Porphyritic
Color
Black, Brown, Green, Grey, White
Maintenance
Less
Durability
Durable
Water Resistant
✔
✘
81% - Igneous Rocks Rocks have it !
Scratch Resistant
✔
✘
86% - Igneous Rocks Rocks have it !
Stain Resistant
✔
✘
66% - Igneous Rocks Rocks
Wind Resistant
✔
✘
49% - Igneous Rocks Rocks have it !
Acid Resistant
✔
✘
48% - Igneous Rocks Rocks
Appearance
Vesicular
Uses
Architecture
Interior Uses
Decorative Aggregates, Flooring, Homes, Interior Decoration
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings
Other Architectural Uses
Curbing
Industry
Construction Industry
Landscaping
Medical Industry
Not Available
Antiquity Uses
Artifacts, Sculpture
Other Uses
Commercial Uses
Production of Lime, Soil Conditioner
Types
Types
Not Available
Features
Host Rock for Lead
Archaeological Significance
Monuments
Not Yet Used
Famous Monuments
Not Applicable
Sculpture
Used
Famous Sculptures
Not Available
Pictographs
Not Used
Petroglyphs
Not Used
Figurines
Used
Fossils
Absent
Formation
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.
Composition
Mineral Content
Alkali feldspar, Nepheline, Plagioclase, Pyroxene
Compound Content
CaO, Carbon Dioxide, MgO, Silicon Dioxide
Transformation
Metamorphism
✔
✘
97% - Igneous Rocks Rocks have it !
Types of Metamorphism
Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism
Weathering
✔
✘
99% - Igneous Rocks Rocks have it !
Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Erosion
✔
✘
92% - Igneous Rocks Rocks have it !
Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion
Properties
Physical Properties
Hardness
6.5
1
7
👆🏻
Grain Size
Medium to Fine Coarse Grained
Fracture
Uneven
Streak
Bluish Black
Porosity
Very Less Porous
Luster
Subvitreous to Dull
Compressive Strength
90.00 N/mm2
Rank: 22 (Overall)
0.15
450
👆🏻
Cleavage
Crenulation and Pervasive
Toughness
2.4
Specific Gravity
2.86
0
8.4
👆🏻
Transparency
Opaque
Density
2.8-2.9 g/cm3
0
1400
👆🏻
Thermal Properties
Specific Heat Capacity
0.92 kJ/Kg K
Rank: 10 (Overall)
0.14
3.2
👆🏻
Resistance
Heat Resistant, Impact Resistant
Reserves
Deposits in Eastern Continents
Asia
Not Available
Africa
Namibia, Uganda
Europe
Germany, Hungary, Italy, Portugal, Spain
Others
Not Available
Deposits in Western Continents
North America
USA
South America
Not Available
Deposits in Oceania Continent
Australia
New Zealand, Western Australia