The manufacture of glass made up of silica was completed both because of the Egyptians—at the least as early as 1500 bce—and by the Phoenicians. Unquestionably, many of the Obviously happening compounds termed silicates were Utilized in various forms of mortar for construction of dwellings with the earliest people. 1 https://www.collcard.com/post/425137_alumina-crucible-a-high-temperature-resistant-ceramic-container-for-metallurgy-a.html