Yagawidwa m'magulu atatu: yopyapyala, yapakatikati ndi yolongosoka. Unyolo wopyapyala ndi wofiira wakuda, unyolo wapakati ndi wofiira pang'ono, ndipo unyolo wopyapyala ndi wofiira ndi woyera. Kukula kwa unyolo uliwonse ndi kofanana, ndipo mawonekedwe a unyolo ndi ofanana. Umatchedwa kristalo wozungulira wokhala ndi m'mbali zakuthwa komanso mphamvu yopera kwambiri.

Popera miyala ya marble ndi zinthu zina zofewa mumakampani a miyala.

Makampani opanga magalasi amagwiritsa ntchito ma glass burrs, ma TV picture tubes, zida zowunikira, ma lens, ma prism, ma clock glass, ndi zina zotero.

Kupukuta mchenga m'mafakitale achitsulo, kuchotsa zinyalala, kupukuta. Makampani osindikizira amapukuta mbale ya offset, ndipo makampani opanga magetsi amakonza chitsanzo cha pulasitiki, chikopa, sandpaper ndi zina zotero.

Mphamvu yopera ya corundum yachilengedwe ndi yotsika pang'ono kuposa ya corundum yoyera yamagetsi, koma kulimba kwake ndi kwamphamvu, ndipo ili ndi mawonekedwe ofanana ndi chipolopolo. Ubwino wake ndi kusalala kwa zigawo zopera, mchenga wochepa komanso wosaya. Malo opera ndi abwino komanso ofanana, zomwe zingathandize kuti zinthu ziyende bwino, zomwe ndi zapadera za mankhwalawa. Emery yachilengedwe ili ndi nthawi yochepa yopera, magwiridwe antchito apamwamba komanso mtengo wotsika, zomwe zingathandize kuti ntchito yake ikhale yochepa.