Diabase normally has a fine but visible texture of euhedral lath-shaped plagioclase crystals (62%) set in a finer matrix of clinopyroxene, typically augite (20–29%), with minor olivine (3% up to 12% in olivine diabase), magnetite (2%), and ilmenite (2%). [3]

In the United States and Canada, the name "diabase" is used for a dark gray to black, fine-grained, intrusive igneous rock that has a composition similar to basalt and gabbro. The difference between basalt, diabase, and gabbro is in their grain size - …

diabase, fine- to medium-grained, dark gray to black intrusive igneous rock. It is extremely hard and tough and is commonly quarried for crushed stone, under the name of trap. Although not popular, it makes an excellent monumental stone and is one of the dark-coloured rocks commercially known as black granite .

Aug 26, 2023 · Diabase, also known as dolerite, is a type of igneous rock that holds significance in the field of geology due to its unique characteristics and formation process. It is an intrusive rock, which means it forms from molten magma that …

Diabase is a dark-colored, fine-grained, igneous rock that consists mostly of plagioclase feldspar and pyroxene. It forms from the solidification of magma in the Earth’s crust and is thus an intrusive rock.

The diabase can be identified by its dark coloration, fine grain size, and the presence of plagioclase feldspar and pyroxene. The naked eye can generally tell if a rock is a diabase if it is fine-grained and has a dark color.

Diabase (dolerite) is a dark-colored igneous rock. It is compositionally equivalent to gabbro and basalt but texturally between them. Diabase is a common rock type. It occurs mostly in shallow intrusions (dikes and sills) of basaltic composition.

Feb 28, 2015 · Diabase is an intrusive igneous rock with the same mineral composition as basalt. It cools under basaltic volcanoes, like those at mid-ocean ridges. Diabase cools moderately …

Basalt and its intrusive equivalents (dolerite and gabbro) are by far the most abundant igneous rocks on the surface of the Earth and other rocky planets and satellites in the solar system. By definition, basalt is a fine-grained basic igneous rock composed of calcic plagioclase and augite, with or without olivine.

It is a fine grained, dark colored igneous rock composed of lath shaped plagioclase (feldspar) crystals surrounded by smaller grains of pyroxene and olivine. It is equivalent to the coarser grained gabbros or diorities in chemical composition.