Kaolin waa macdan aan bir ahayn, taas oo ah nooc dhoobo iyo dhagax dhoobo ah oo inta badan ka kooban macdanta dhoobada ah ee kooxda Kaolinite.Muuqaalkeeda cad ee jilicsan awgeed, waxaa sidoo kale loo yaqaannaa ciidda Bayuun.Waxaa loo magacaabay tuulada Gaoling ee Jingdezhen, Gobolka Jiangxi.

Kaolin-keeda saafiga ah waa caddaan, jilicsan iyo sida Mollisol, oo leh caag wanaagsan, iska caabin dab ah iyo waxyaabo kale oo jireed iyo kiimiko ah.Halabuurka macdanta ayaa inta badan ka kooban Kaolinite, halloysite, hydromica, Illite, Montmorillonite, quartz, feldspar iyo macdano kale.Kaolin waxaa si weyn loogu isticmaalaa samaynta waraaqaha, ceramics, iyo alaabta refractory, oo ay ku xigto daahan, caag buuxinaya, dhaldhalaalka dhaldhalaalka, iyo sibidhka cad alaabta ceeriin.Qadar yar ayaa loo isticmaalaa balaastikada, rinjiga, midabada, giraangiraha wax lagu shiidi karo, qalinleyda, waxyaalaha la isku qurxiyo ee maalinlaha ah, saabuunta, sunta cayayaanka, dawooyinka, dunta, batroolka, kiimikooyinka, qalabka dhismaha, difaaca qaranka, iyo qaybaha kale ee warshadaha.

Macdanta Kaolin waxay ka kooban tahay Kaolinite, dickite, dhagax luul, halloysite iyo macdano kale oo Kaolinite ah, qaybta ugu muhiimsan ee macdanta waa Kaolinite.

Qaacidada kimistariga Crystal ee Kaolinite waa 2SiO2 ● Al2O3 ● 2H2O, iyo ka kooban yahay kimistari Theoretical waa 46.54% SiO2, 39.5% Al2O3, 13.96% H2O.Macdanta Kaolin waxay ka tirsan tahay 1: 1 silicate lakab ah, iyo crystal inta badan wuxuu ka kooban yahay silica tetrahedron iyo alumina Octahedron.Tetrahedron-ka silica wuxuu ku xiran yahay jihada laba-geesoodka ah iyadoo la wadaagayo xagasha vertex si loo sameeyo lakab xargo leh, iyo ogsijiinta ugu sarreysa ee aan la wadaagin silica tetrahedron kasta waxay wajihi doontaa hal dhinac;Lakabka unugga nooca 1:1 waxa uu ka kooban yahay lakabka tetrahedron silicon oxide iyo aluminium oxide Octahedron lakabka, kaas oo wadaaga ogsijiinta caarada lakabka tetrahedron silicon oxide.