How do you say “obsidian” in Vietnamese?

Vietnamese words for “obsidian”

• đá vỏ chaiListennoun
  Hanoi [ʔɗaː˧˦ vɔ˧˩ t͡ɕaːj˧˧] · Saigon [ʔɗaː˦˥ vɔ˨˩˦ caːj˧˧]đá rising vỏ dipping chai level

  obsidian; volcanic glass

  for “obsidian” meaning: A type of naturally occurring black glass produced by volcanoes.

• hắc diện thạchListennoun
  Hanoi [hak̚˧˦ ziən˧˨ʔ tʰajk̟̚˧˨ʔ] · Saigon [hak̚˦˥ jiəŋ˨˩˨ tʰat̚˨˩˨]hắc rising diện heavy thạch heavy

  obsidian; volcanic glass

  for “obsidian” meaning: A type of naturally occurring black glass produced by volcanoes.

• hắc diệu thạchListennoun
  Hanoi [hak̚˧˦ ziəw˧˨ʔ tʰajk̟̚˧˨ʔ] · Saigon [hak̚˦˥ jiw˨˩˨ tʰat̚˨˩˨]hắc rising diệu heavy thạch heavy

  obsidian

  for “obsidian” meaning: A type of naturally occurring black glass produced by volcanoes.