trachyte's Usage Examples:

of the best rubble masonry, an ashlar floor of blocks of close-grained trachyte being laid directly under the bridge, where the action was severest.

In the south of the island there are sills and dykes of felsite, quartz-porphyry, rhyolite, trachyte and pitchstone.

), are both solid masses of trachyte; and both rise above the limits of perpetual snow.

Large areas are overlain with trachyte, basalt, obsidian, tuff and pumice.

The mountain is quarried, and from 1267 onward supplied stone (trachyte) for the building of Cologne cathedral.

They are, first, plutonic rocks, especially granite; secondly, volcanic rocks, chiefly trachyte and dolerite; and thirdly, palaeozoic schists.

Basic lavas, with andesites, trachytes, tuffs and agglomerates are the most common Scottish rocks of this period.

The two leading types of volcanic areas are the plateaus, in which sheets of porphyrites, basalts and even trachytes were emitted, sometimes with wide discharge of volcanic ashes, and the puys, or isolated vents, or scattered groups of vents, which discharged comparatively a small amount of lava and ashes.

They are formed of trachyte, dolerite and basalt.

- Recent volcanic eruptive rocks (including rhyolite, trachyte, phonolite, andesite and basalt) have been examined at a number of points throughout both the geological regions of the island.