ʌnfˈɔːɹtʃənətli, nˌɑːt ˈɔːl sˈʌtʃ tˈuːl stˈoʊnz wɜː hˈiːttɹˈiːɾᵻd, ænd nˌɑːt ˈɔːl hˈiːttɹˈiːtmənt ɪz dˈuː tə hjˈuːmən ˈeɪdʒənsi.
Unfortunately, not all such tool stones were heat-treated, and not all heat-treatment is due to human agency.