ðə mətˈɪɹiəl ɪz fˈɔːɹmd baɪ hˈiːɾɪŋ sˈɪlɪkən ænd sˈʌlfɜːɹ ɔːɹ baɪ ðɪ ɛkstʃˈeɪndʒ ɹɪˈækʃən bᵻtwˌiːn sˈiː ˈoʊ tˈuː ænd ˈæl tˈuː z θɹˈiː.
The material is formed by heating silicon and sulfur or by the exchange reaction between SiO2 and Al2S3.