The rock on which they sit is composed of oxidized brass.

Serpentinite is a rock composed of one or more serpentine group minerals.

So volcanic rocks are composed of only a few mineral groups, each group having its own characteristic atomic structure.

The other essential elements of a scholar garden were plants, trees, and rocks, all carefully composed into small perfect landscapes.

A rock composed of quartz and epidote is known as epidosite.

But more often the plates stick because the rocks on either side are strong and composed of complicated strata that do not easily slide.

The red rocks are composed of dark purple sand gravel laid down during the Permian period.

The rock of the mountain is composed of smooth, fine-grained granite.

The huge rocks are composed of solid black, crystalline Karst limestone.

The rocks are composed of a mixture of sandstone and conglomerate.