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dacite

[dā′sīt′]
  1. 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.
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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

  • 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.

  • The lavas and ashes ejected by these volcanoes consist of liparite, dacite, andesite and basalt.