Ko te wāhanga matua o te talc ko te hydrotalcite hydrous magnesium silicate me te tātai ngota o mg3 [si4o10] (OH) 2. Nō te pūnaha monoclinic te talc. He pseudohexagonal, he rhombic rānei te tioata, i ētahi wā. He maha ngā wā he matotoru, he rau, he radial, he muka ngā mea kohikohinga. Kāore he tae, he mārama, he mā rānei, engari he kakariki mārama, he kōwhai mārama, he parauri mārama, he whero mārama rānei nā te iti o ngā poke; he kanapa te mata o te wehenga. Te pakeketanga 1, te taumaha motuhake 2.7-2.8.

He tino pai ngā āhuatanga ā-tinana, ā-matū hoki o te paura tāke pērā i te whakahinuhinu, te ātete ahi, te ātete waikawa, te ārai wera, te teitei o te ira rewa, te kore mahi matū, te kaha hipoki pai, te ngawari, te kanapa pai, te kaha mimiti, me ētahi atu. Nā te mea he paparanga te hanganga tioata o te tāke, he ngāwari te wehewehe ki ngā unahi me te whakahinuhinu motuhake. Mena he tino teitei te ihirangi o te Fe2O3, ka heke tōna ārai wera.

Te whakamahinga o te talc:

(1) Te taumata whakapaipai (Hz): e whakamahia ana mō ngā momo paura whakamakuku katoa, paura ataahua, paura papa, me ētahi atu.

(2) Rongoā kai kounga (YS): papa rongoā, paninga huka, paura werawera, whakahaunga rongoā Hainamana, tāpiringa kai, kaihoko wehe, me ētahi atu.

(3) Te taumata paninga (TL): e whakamahia ana mō te tae tinana mā me ngā momo paninga wai-hanga, hinu-hanga, kapia ahumahi, paninga tuatahi, peita tiaki, me ētahi atu.

(4) Te taumata pepa (zz): hei whakakī mō ngā momo pepa me ngā papa pepa katoa, hei whakahaere uku rakau.

(5) Te karaehe kirihou (SL): hei whakakī mō te polypropylene, te nairona, te polyvinyl chloride, te polyethylene, te polystyrene, te polyester me ētahi atu kirihou.

(6) Te karaehe rapa (AJ): e whakamahia ana mō te whakakī rapa me te ārai piri o ngā hua rapa.