thạch tín

== Vietnamese == === Etymology === Sino-Vietnamese word from 石 (“stone”) and 信 (“arsenolite”), calque of Chinese 信石 (arsenolite). === Pronunciation === (Hà Nội) IPA(key): [tʰajk̟̚˧˨ʔ tin˧˦] (Huế) IPA(key): [tʰat̚˨˩ʔ tin˦˧˥] (Saigon) IPA(key): [tʰat̚˨˩˨ tɨn˦˥] === Noun === thạch tín (mineralogy) arsenolite