Portland Cement

Oxide	Analysis	Formula
CaO	62.28%	0.95
MgO	2.22%	0.05
Al2O3	7.55%	0.06
SiO2	22.65%	0.32
Fe2O3	2.11%	0.01
LOI	3.20%	n/a
Oxide Weight		83.09
Formula Weight		85.83

Notes

Manufactured using limestone and shale. Powder is mixed and fired in a rotary kiln to near-stoneware temperatures. The clinker is finely ground to produce a grey powder that reacts with water to form a hydrous calcium silicate with some CaO left over.

Acids do attack cement however as soluble materials are removed less reactive remaining materials are quite stable.

By Tony Hansen
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