hắc diện thạch

== Vietnamese == === Etymology === Sino-Vietnamese word from 黑 (“black”), 涎 (“shiny”) and 石 (“rock”). Compare Chinese 黑曜石 (hēiyàoshí, “obsidian”). === Pronunciation === (Hà Nội) IPA(key): [hak̚˧˦ ziən˧˨ʔ tʰajk̟̚˧˨ʔ] (Huế) IPA(key): [hak̚˦˧˥ jiəŋ˨˩ʔ tʰat̚˨˩ʔ] (Saigon) IPA(key): [hak̚˦˥ jiəŋ˨˩˨ tʰat̚˨˩˨] === Noun === hắc diện thạch (geology) obsidian; volcanic glass Synonym: đá vỏ chai