What is it made of?
Gabbro is composed of calcium-rich plagioclase feldspar and clinopyroxene. There are some small amounts of olivine and orthopyroxene in the rock.
Physical characteristics: Gabbro is usually black or dark green in color. Gabbro has large crystals.
How and where is it formed?
Gabbro is formed when molten rock is trapped beneath the lands surface and cools into a hard coarsely crystalline mass.
What is Gabbro used for?
Gabbro can be polished to a brilliant black luster. Brightly polish gabbro is used to make cemetery markers, kitchen counter tops, floor tiles, facing stone and other dimension stone products. It is a highly desirable rock that stands up to weathering and wear.