Flintstones often have a rough lumpy surface but when they are broken, they look like dark glass. It has been one of the most useful types of stone to humankind.
f l ɪ n t s t oʊ n z WORD_BOUNDARY ɔ f ə n WORD_BOUNDARY h æ v WORD_BOUNDARY ʌ WORD_BOUNDARY ɹ ʌ f WORD_BOUNDARY l ʌ m p i WORD_BOUNDARY s ɜː f ɪ s WORD_BOUNDARY b ʌ t WORD_BOUNDARY w ɛ n WORD_BOUNDARY ð eɪ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY b ɹ oʊ k ə n WORD_BOUNDARY ð eɪ WORD_BOUNDARY l ʊ k WORD_BOUNDARY l aɪ k WORD_BOUNDARY d ɑ ɹ k WORD_BOUNDARY ɡ l æ s WORD_BOUNDARY ɪ t WORD_BOUNDARY h æ z b iː n WORD_BOUNDARY w ʌ n WORD_BOUNDARY ʌ v ð ə WORD_BOUNDARY m oʊ s t WORD_BOUNDARY j uː s f ə l WORD_BOUNDARY t aɪ p s WORD_BOUNDARY ʌ v WORD_BOUNDARY s t oʊ n WORD_BOUNDARY t ə WORD_BOUNDARY h j uː m ʌ ŋ k aɪ n d WORD_BOUNDARY