Yenziwe kusetshenziswa isikhunta, izinto zayo zokusetshenziswa eziyinhloko yisihlabathi se-quartz ne-alkali nezinye izinto ezisizayo. Ngemva kokuncibilika ngaphezu kwe-1200 ° C izinga lokushisa eliphezulu, ikhiqizwa ngezindlela ezihlukene ngokubunjwa kwezinga lokushisa eliphezulu ngokuvumelana nokubunjwa kwesikhunta. Ayinabuthi futhi ayinaphunga. Ilungele izimonyo, ukudla, ...
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