igneous
Diabase
Diabase (Dolerite)
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, dark gray to black color, submetallic to dull luster, ophitic texture with interlocking plagioclase and pyroxene crystals, specific gravity of 2.8-3.0.
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Physical properties
Hardness of 6-7 on Mohs scale, dark gray to black color, submetallic to dull luster, ophitic texture with interlocking plagioclase and pyroxene crystals, specific gravity of 2.8-3.0.
Formation & geological history
Formed from cooling mafic magma intruded as shallow dikes and sills within the Earth's crust, typically during active rifting or volcanic events.
Uses & applications
Widely used as crushed stone for construction, aggregate in concrete, road ballast, and occasionally for dimensional stone and monuments.
Geological facts
Also known as dolerite, it is chemically equivalent to basalt and gabbro but differs in crystal grain size and intrusive cooling depth.
Field identification & locations
Identify in the field by its distinct dark, speckled appearance featuring needle-like plagioclase laths embedded in a finer pyroxene matrix; commonly found worldwide in ancient and active volcanic provinces.
