Kaolinite
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Kaolinite is a clay mineral, with the chemical composition Al₂Si₂O₅(OH)₄. It is a layered silicate mineral, with one tetrahedral sheet of silica linked through oxygen atoms to one octahedral sheet of alumina. Wikipedia
Colors: white
Cleavage: Perfect on
Crystal class: Pedial (1); (same H-M symbol)
Crystal system: Triclinic
IMA symbol: Kln
Luster: Pearly to dull earthy
Mohs scale hardness: 2–2.5