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www.britannica.com/science/diabase

Diabase, also called Dolerite, 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.Diabase is widespread and occurs in dikes (tabular bodies ...

en.wikipedia.org/wiki/Diabase

Diabase (/ ˈ d aɪ. ə b eɪ s /) or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite (dark mafic glass).

www.encyclopedia.com/.../geology-and-oceanography/diabase

dolerite (diabase, microgabbro) A dark-coloured, medium-grained igneous rock which contains plagioclase feldspar of labradorite composition and pyroxene of augite or titanaugite composition as essential minerals, and magnetite, titano-magnetite, or ilmenite as accessory minerals.

www.reference.com/science/dolerite-59a0b40f4aff9fc4

It is also referred to as a volcanic rock. The dolerite rock is similar to basalt, but it is coarser in texture and contains crystals that can be viewed with a hand-held lens because dolerite cools more slowly than basalt. Several dolerites are present in Ireland. The most famous is the dolerite plug at Slemish.

www.collecting-rocks-and-minerals.com/dolerite.html

Minerals in this rock include olivine, plagioclase feldspar, pyroxene, quartz and sometimes ilmenite, biotite, hornblende and magnetite. Dolerite. By Oor Woolie via Flickr.com It often forms in basaltic provinces as sills and dykes, (which are igneous intrusions). By brewbooks via Flickr.com

www.thefullwiki.org/Dolerite

In non-North American usage dolerite is preferred due to the various conflicting uses of diabase.Dolerite (Greek: doleros, meaning "deceptive") was the name given by Haüy in his 1822 Traité de minéralogie.In continental Europe diabase was reserved by Brongniart for pre-Tertiary (pre-Cenozoic) material [5], with dolerite used for more recent rock. The use of diabase in the this sense was ...

www.sandatlas.org/diabase

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.

facts.thefullwiki.org/Dolerite

Dolerite: Facts Advertisements the rock gong was a neolithic musical instrument made out of dolerite that would resonate with a metallic tone when struck with a small igneous stone?

geology.com/rocks/diorite.shtml

Diorite is an intrusive igneous rock of intermediate composition. Uses of Diorite. In areas where diorite occurs near the surface, it is sometimes mined for use as a crushed stone.It has a durability that compares favorably to granite and trap rock.It is used as a base material in the construction of roads, buildings, and parking areas.

www.softschools.com/facts/geology/dolomite_facts/376

Dolomite is a mineral and a rock that has a unique saddle-shaped crystal. It is made up of calcium magnesium carbonate and most likely exists in sedimentary or metamorphic rocks. Dolomite is commonly found in many European areas, Canada, and Africa.