Kaolin waa macdan aan bir ahayn, oo ah nooc ka mid ah dhagaxa dhoobada iyo dhoobada oo inta badan ka kooban macdanta dhoobada ee kooxda Kaolinite. Sababo la xiriira muuqaalkeeda cad iyo jilicsan, waxaa sidoo kale loo yaqaan ciidda Baiyun. Waxaa loogu magac daray Tuulada Gaoling ee Jingdezhen, Gobolka Jiangxi.

Kaolin saafi ah waa caddaan, jilicsan oo la mid ah Mollisol, oo leh dabacsanaan wanaagsan, iska caabin dab iyo sifooyin kale oo jireed iyo kiimiko ah. Macdanta ku jirta waxaa inta badan ka kooban Kaolinite, halloysite, hydromica, Illite, Montmorillonite, quartz, feldspar iyo macdano kale. Kaolin waxaa si weyn loogu isticmaalaa sameynta waraaqaha, dhoobada, iyo walxaha aan la karin, waxaana ku xiga dahaarka, buuxinta caagga ah, muraayadaha dhaldhalaalka, iyo walxaha ceeriin ee sibidhka cad. Qadar yar ayaa loo isticmaalaa balaastikada, rinjiga, midabada, giraangiraha shiididda, qalinka, qurxinta maalinlaha ah, saabuunta, sunta cayayaanka, daawooyinka, dharka, batroolka, kiimikada, qalabka dhismaha, difaaca qaranka, iyo qaybaha kale ee warshadaha.

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

Qaacidada kiimikada ee Crystal ee Kaolinite waa 2SiO2 ● Al2O3 ● 2H2O, halabuurka kiimikada aragtiyeedna waa 46.54% SiO2, 39.5% Al2O3, 13.96% H2O. Macdanta Kaolin waxay ka tirsan tahay silicate nooca 1:1 ah oo lakab leh, kiristaalkuna wuxuu inta badan ka kooban yahay tetrahedron silica iyo alumina Octahedron. Tetrahedron silica waxay ku xiran tahay jihada laba-geesoodka ah iyadoo la wadaagayo xagasha leexashada si ay u sameyso lakab shabag oo lix-geesood ah, oksijiinta ugu sarreysa ee aan la wadaagin tetrahedron silica kastana waxay u jeesataa hal dhinac; Lakabka cutubka nooca 1:1 wuxuu ka kooban yahay lakabka tetrahedron ee silicon oxide iyo lakabka aluminium oxide Octahedron, kuwaas oo wadaaga oksijiinta caarada ee lakabka tetrahedron ee silicon oxide.