Yashi ma'adini shine muhimmin albarkatun ma'adinai na masana'antu. Abu ne mai haɗari wanda ba na sinadari ba kuma yana da nau'ikan aikace-aikace, kamar: gilashin, yumbu, kayan gyarawa, jigilar ruwa, jigilar jirgin ƙasa, gine-gine, masana'antar sinadarai da sauran masana'antu. Domin ba shi da haɗari, babu matsala tare da kowace hanyar sufuri. Duk da haka, bayyanar yashi gilashin ƙananan ƙananan ƙwayoyin cuta ne kuma marasa daidaituwa. Bayan da aka gasa a zafin jiki mai zafi na kusan 520-580, yashin gilashin yana hade da yanki na aikin gilashi don samar da yanayi mara kyau mai girma uku, wanda aka fi amfani dashi don yin kayayyakin gilashi. Gilashin yashi ya kasu kashi yashi mai launin gilashi da yashi gilashin m. Bayyanar yashi gilashin gaskiya kamar farin sukari ne. Yashin gilashin ya samo asali ne saboda kayan ado na gilashin, kamar gilashin, vases, fitilu da sauransu. Yashi mai launin gilashi, wanda kuma aka sani da yashi mai launi, ana iya amfani dashi azaman kayan ado.
