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Skye's Black Cuillin, composed of basalt and rough gabbro, is generally regarded as the most serious mountain terrain in Britain with bare rock, jagged in outline and steep cliffs and deep cut corries.

Dolerite is similar in composition to basalt, which is eruptive (from volcanoes), and gabbro, which is plutonic.

Individual rock types can be grouped into a troctolite phase or series, a gabbro phase or series and a gabbronorite phase or series.

It is supported by two large concrete pylons also faced with gabbro.

The cumulate rock is a plagioclase-pyroxene cumulate (a gabbro) and the melt is now more felsic and aluminous in composition (trending towards andesite compositions).

All the major landmarks in Jay Cooke are built with local basalt or gabbro stone and dark planks and logs.

Eucrite is also a now obsolete term for bytownite-gabbro, an igneous rock formed in the Earth's crust.

It is a conical body, approximately 7"nbsp;km thick, primarily composed of layered gabbroic rocks, which intrude into c.

However, unlike gabbro, no troctolite corresponds in composition to a partial melt of peridotite.

A layer with 50% plagioclase, 40% pyroxene, 5% olivine and 5% groundmass (in essence a gabbro) would be termed a plagioclase-pyroxene Adcumulate with accessory olivine.

The minerals can be precipitated in any ratio within the cumulate; such cumulates can be 90% plagioclase:10% enstatite, through to 10% plagiclase:90% enstatite and remain a gabbro.

The differing crystal sizes are due to the different rate of cooling, basalt cools quickly and has a very fine structure, while gabbro cools very slowly, at great depth, and large crystals develop.

The rock types are primarily pyroxene gabbro to amphibolite, with rare serpentinised peridotite and dunite, occasionally containing relict igneous or metamorphic olivine.