M MineralystRock & Mineral Guide
Mineral

Kaolinite

Kaolinite — reference photo

Kaolinite is a mineral with the chemical formula Al2Si2O5(OH)4. It has a Mohs hardness of 2-2.5 and pearly to dull luster.

Kaolinite properties

TypeMineral
Chemical formulaAl2Si2O5(OH)4
Mohs hardness2-2.5
LusterPearly to dull
Typical colorsWhite, yellowish, gray, greenish
FormationForms from the weathering of feldspar-rich rocks
Rarity3 / 10

Mohs hardness 2–2.5 — very soft

1 · Talc5 · Apatite10 · Diamond
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