Ko te kōhatu puia (e mōhiotia whānuitia ana ko te pumice, ko te basalt porous rānei) he rauemi whai hua, he rauemi taiao hoki, he kōhatu porous tino utu nui i hangaia e te karāhe puia, ngā kohuke, me ngā mirumiru i muri i te pahūtanga o te puia. Kei roto i te kōhatu puia he maha ngā kohuke me ngā huānga iti pēnei i te konutai, te konupūmā, te konumohe, te silicon, te konupūmā, te titanium, te manganese, te rino, te nickel, te cobalt, me te molybdenum. Kāore e pā ki te hihi, ā, he ngaru aukume infrared tawhiti. Whai muri i te pahūtanga o te puia, i muri i ngā tekau mano tau, kei te piki haere te kitea e te tangata tōna uara. Kua whānui ake ōna mara tono ki ngā mara pēnei i te hoahoanga, te tiaki wai, te huri, ngā rauemi tātari, te waro tunutunu, te whakapaipai whenua, te whakatipu kore oneone, me ngā hua whakapaipai, ā, he mahi nui tana i roto i ngā momo ahumahi.

He momo rauemi hou te kōhatu puia, he rauemi whai hua, he rauemi taiao hoki, he kōhatu tino utu nui i hangaia mai i te karāhe puia, ngā kohuke, me ngā mirumiru i muri i ngā pahūtanga o te puia. He maha ngā kohuke me ngā huānga iti kei roto i te kōhatu puia pērā i te konutai, te konupūmā, te konumohe, te silicon, te konupūmā, te titanium, te manganese, te rino, te lithium, te nickel, te cobalt, me te molybdenum.

Ko ōna āhuatanga he māmā, he kaha teitei, he ārai wera, he mimiti oro, he ātete ahi, he ātete waikawa me te kawakore, he ātete waikura, kāore he parahanga, kāore he hihi, me te maha o ngā pūwero iti i runga i te mata, pērā i ngā pūwero i runga i te kiri. Mā te rumaki ki te hinu miihini ka taea te mimiti haere i ngā wāhanga hinu kakara, kātahi ka tukuna mārire ki te kiri, ka taea ai e rātou te uru ki roto i te tinana tangata. Hei tāpiri, ka honoa ki ngā hua hinu kakara kua hangaia me ngā tikanga whakakore paitini taiapa motuhake, kua piki haere te whakamahinga o ngā kōhatu puia i roto i te rongoā me te ataahua i ngā tau tata nei nā te mea ka taea e rātou te whakaoti i ngā raruraru kiri whakarihariha maha.