tūhua
1. (noun) obsidian - a hard, dark, glass-like volcanic rock which was used for cutting.
Ka tere mātao te tokarewa, ā, ka hua mai he toka matarehu pērā i te ōnewa, te tokapata me te tūhua (RP 2009:406). / The magma cools quickly and fine-grained rocks like basalt, granite and obsidian are produced.
Synonyms: matā, matā tūhua, mātara