dacite

[dā′sīt′]

A fine-grained light gray volcanic rock consisting primarily of quartz, plagioclase feldspar, and potassium feldspar, and also containing biotite, hornblende, or pyroxene. It is the fine-grained equivalent of granodiorite.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Examples from the Web for dacite

Historical Examples of dacite

I wonder if they are visible from the dacite elevation on which SHE lives.
Of All Things
Robert C. Benchley
Dacite is the lava of Krakatoa and some of the volcanoes of Japan.
Volcanoes: Past and Present
Edward Hull
The lavas and ashes ejected by these volcanoes consist of liparite, dacite, andesite and basalt.
Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 2
Various