dacite

American  

[day-sahyt] / ˈdeɪˌsaɪt /

noun

plural

dacites

1. Geology. a gray volcanic rock similar to andesite but bearing quartz as a distinct characteristic.

---

dacite Scientific  

/ 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.

---

Other Word Forms

• dacitic adjective