Yakagadzirwa uchishandisa mold, yayo huru mbishi jecha requartz uye alkali uye zvimwe zvekubatsira. Mushure mekunyunguduka pamusoro pe1200 ° C tembiricha yakakwira, inogadzirwa mumhando dzakasiyana nekuumbwa kwekushisa kwepamusoro zvichienderana nechimiro che mold. Kwete-chepfu uye isinganhuhwi. Inokodzera zvizorwa, chikafu, ...
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