gabbro
/ˈɡæbroʊ/
noun
- A dark, coarse-grained igneous rock that forms when magma cools slowly beneath the Earth's surface. It is often used in construction and as a source of crushed stone.
- The mountain road was paved with crushed gabbro, giving it a dark, speckled appearance.
- Gabbro is sometimes polished and used as a decorative stone for countertops and monuments.
- Geologists identified the black, speckled cliff as a large deposit of gabbro.