Mineralogical

Chemical

Physical

CaCO3

Cu

Grain size distribution

CaCO3 + MgCO3

Mg

Oil sorption

Fe2O

Mn

Al2O3

As

Fe2O + AlO3

Pb

SiO2

Fe

CaO

P

Alkali metals

Hg

FI

LoI

pH

Acids insoluble

C > 12