Mchenga wamitundu yachilengedwe umachokera ku Dziko Lapansi. Umachokera ku miyala ndi mchere zomwe zimakhala ndi utoto wosiyanasiyana. Iron oxide ndi imodzi mwa mitundu yachilengedwe yodziwika bwino, yomwe imayambitsa mithunzi yofiira, lalanje, ndi bulauni yomwe imapezeka m'michenga yambiri yamitundu yachilengedwe. Mwachitsanzo, mitundu yofiira - bulauni ya mchenga wina wa m'chipululu imachokera ku kuchuluka kwa iron oxide. Manganese imatha kuyambitsa mitundu yakuda kapena yofiirira, pomwe mankhwala amkuwa amatha kuyambitsa mitundu yobiriwira ndi yabuluu. Kutulutsa mchenga wamitundu yachilengedwe kumayamba ndi ntchito zofukula m'matanthwe kapena m'mphepete mwa mitsinje komwe kuli utoto uwu. Ukangofukulidwa, zinthu zopangirazo zimadutsa munjira zingapo zokonzera. Kuphwanya miyala ikuluikulu kukhala zidutswa zing'onozing'ono, kutsatiridwa ndi kupukutira kuti mchengawo ukhale wosiyana kukula. Kenako kutsukidwa kumachitika kuti kuchotse zonyansa monga dongo, fumbi, ndi tinthu tina tosafunikira, kuonetsetsa kuti mchengawo uli ndi chiyero chapamwamba komanso mtundu womwe ukufunidwa.

Mchenga wopangidwa ndi utoto wopangidwa ndi anthu, mosiyana, umapangidwa kudzera mu njira zopangidwa ndi anthu. Kawirikawiri, chinthu choyambira, nthawi zambiri mchenga wa quartz chifukwa cha kuchuluka kwake, kuuma kwake, komanso mtundu wake wosalowerera, chimagwiritsidwa ntchito ngati maziko. Njira zamakono zopangira utoto zimagwiritsidwa ntchito popaka kapena kupaka utoto tinthu ta mchenga wa quartz. Opanga amagwiritsa ntchito utoto wapamwamba komanso zinthu zomangira bwino kuti atsimikizire kuti mtunduwo ukugwirizana kwambiri ndi tinthu ta mchenga. Njira zapadera zokutira utoto zimatha kupanga mtundu wofanana komanso wokhalitsa, zomwe zimapangitsa kuti mitundu yambiri ikhale yovuta kupeza mwachilengedwe. Kudzera mu kuwongolera mosamala njira zopangira, mchenga wopangidwa ndi utoto wopangidwa ukhoza kukhala ndi mtundu wabwino komanso kugawa tinthu, kukwaniritsa zofunikira za mafakitale osiyanasiyana.