Definition
Diabase is a fine-grained igneous rock which is composed mostly of pyroxene and feldspar
  
Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.
  
History
  
  
Origin
Germany
  
USA
  
Discoverer
Christian Leopold von Buch
  
Unknown
  
Etymology
From Greek di + base
  
From pseudo- + tachylite, a glassy rock generated by frictional heat within faults.
  
Class
Igneous Rocks
  
Metamorphic Rocks
  
Sub-Class
Durable Rock, Hard Rock
  
Durable Rock, Hard Rock
  
Family
  
  
Group
Volcanic
  
Not Applicable
  
Other Categories
Fine Grained Rock, Medium Grained Rock, Opaque Rock
  
Fine Grained Rock, Opaque Rock
  
Texture
Aphanitic, Granular
  
Quench
  
Color
Dark Grey to Black
  
Black, Brown, Colourless, Green, Grey, Pink, White
  
Maintenance
Less
  
Less
  
Durability
Durable
  
Durable
  
Water Resistant
Yes
  
Yes
  
Scratch Resistant
Yes
  
Yes
  
Stain Resistant
Yes
  
No
  
Wind Resistant
Yes
  
Yes
  
Acid Resistant
Yes
  
Yes
  
Appearance
Vesicular
  
Dull and Soft
  
Architecture
  
  
Interior Uses
Countertops, Decorative Aggregates, Homes, Interior Decoration, Kitchens
  
Decorative Aggregates, Entryways, Interior Decoration
  
Exterior Uses
As Building Stone, As Facing Stone, Paving Stone, Garden Decoration, Office Buildings
  
As Building Stone, As Facing Stone, Garden Decoration
  
Other Architectural Uses
Curbing
  
Curbing
  
Industry
  
  
Construction Industry
As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate
  
As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement
  
Medical Industry
Not Yet Used
  
Not Yet Used
  
Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines
  
Artifacts, Monuments
  
Other Uses
  
  
Commercial Uses
An Oil and Gas Reservoir, Cemetery Markers, Commemorative Tablets, Laboratory bench tops, Jewelry, Sea Defence, Tombstones
  
Creating Artwork, Gemstone
  
Types
Not Available
  
Not Available
  
Features
Smooth to touch
  
Host Rock for Lead
  
Archaeological Significance
  
  
Monuments
Used
  
Used
  
Famous Monuments
Stonehenge in English county of Wiltshire
  
Data Not Available
  
Sculpture
Used
  
Not Yet Used
  
Famous Sculptures
Data Not Available
  
Not Applicable
  
Pictographs
Not Used
  
Not Used
  
Petroglyphs
Not Used
  
Not Used
  
Figurines
Used
  
Not Yet Used
  
Fossils
Absent
  
Absent
  
Formation
Diabase forms when molten igneous rock is squeezed up into a vertical crack in other rocks, the crack is usually forced apart and the molten rock cools in the space to form a tabular igneous intrusion cutting across the surrounding rocks and is known as a dike.
  
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Pseudotachylite is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.
  
Composition
  
  
Mineral Content
Augite, Chlorite, Olivine, Plagioclase, Pyroxene, Pyrrhotite, Serpentine
  
Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides
  
Compound Content
Aluminium Oxide, CaO, Chromium(III) Oxide, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Sulfur Trioxide
  
Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur
  
Transformation
  
  
Metamorphism
Yes
  
Yes
  
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism
  
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism
  
Weathering
Yes
  
No
  
Types of Weathering
Biological Weathering, Chemical Weathering
  
Not Applicable
  
Erosion
Yes
  
No
  
Types of Erosion
Chemical Erosion, Coastal Erosion, Water Erosion
  
Not Applicable
  
Physical Properties
  
  
Hardness
7
  
7
  
Grain Size
Fine to Medium Grained
  
Very fine-grained
  
Fracture
Conchoidal
  
Uneven
  
Streak
Black
  
Light to dark brown
  
Porosity
Highly Porous
  
Less Porous
  
Luster
Not Available
  
Vitreous
  
Compressive Strength
225.00 N/mm2
  
7
60.00 N/mm2
  
25
Cleavage
Not Available
  
Irregular
  
Toughness
1.6
  
Not Available
  
Specific Gravity
2.86-2.87
  
2.46-2.86
  
Transparency
Opaque
  
Transparent to Translucent
  
Density
2.7-3.3 g/cm3
  
2.7-2.9 g/cm3
  
Thermal Properties
  
  
Specific Heat Capacity
Not Available
  
0.92 kJ/Kg K
  
10
Resistance
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
  
Heat Resistant
  
Deposits in Eastern Continents
  
  
Asia
India
  
South Korea
  
Africa
South Africa, Tanzania
  
Western Africa
  
Europe
Germany, Greece, Italy, Scotland, Turkey
  
Great Britain, Switzerland
  
Others
Antarctica, Greenland
  
Not Yet Found
  
Deposits in Western Continents
  
  
North America
Canada, USA
  
Not Yet Found
  
South America
Argentina, Brazil, Colombia, Venezuela
  
Not Yet Found
  
Deposits in Oceania Continent
  
  
Australia
Central Australia, New Zealand, Queensland, Western Australia
  
Central Australia, Western Australia
  
Diabase vs Pseudotachylite Characteristics
Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Diabase vs Pseudotachylite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Diabase and Properties of Pseudotachylite. Learn more about Diabase vs Pseudotachylite in the next section. The interior uses of Diabase include Countertops, Decorative aggregates, Homes, Interior decoration and Kitchens whereas the interior uses of Pseudotachylite include Decorative aggregates, Entryways and Interior decoration. Due to some exceptional properties of Diabase and Pseudotachylite, they have various applications in construction industry. The uses of Diabase in construction industry include As dimension stone, Building houses or walls, Cement manufacture, Construction aggregate, For road aggregate and that of Pseudotachylite include As dimension stone, Cement manufacture, For road aggregate, Making natural cement.
More about Diabase and Pseudotachylite
Here you can know more about Diabase and Pseudotachylite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Diabase and Pseudotachylite consists of mineral content and compound content. The mineral content of Diabase includes Augite, Chlorite, Olivine, Plagioclase, Pyroxene, Pyrrhotite, Serpentine and mineral content of Pseudotachylite includes Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides. You can also check out the list of all Igneous Rocks. When we have to compare Diabase vs Pseudotachylite, the texture, color and appearance plays an important role in determining the type of rock. Diabase is available in dark grey to black colors whereas, Pseudotachylite is available in black, brown, colourless, green, grey, pink, white colors. Appearance of Diabase is Vesicular and that of Pseudotachylite is Dull and Soft. Properties of rock is another aspect for Diabase vs Pseudotachylite. Hardness of Diabase and Pseudotachylite is 7. The types of Diabase are Not Available whereas types of Pseudotachylite are Not Available. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Diabase is black while that of Pseudotachylite is light to dark brown. The specific heat capacity of Diabase is Not Available and that of Pseudotachylite is 0.92 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Diabase is heat resistant, impact resistant, pressure resistant, wear resistant whereas Pseudotachylite is heat resistant.