Vermiculite

Oxide	Analysis	Formula
CaO	10.99%	0.26
Li2O	0.06%	-
MgO	22.20%	0.74
Al2O3	7.96%	0.10
SiO2	49.00%	1.09
LOI	9.80%	n/a
Oxide Weight		120.48
Formula Weight		133.57

Notes

Clay-making mineral of the ideal form (Mg, Ca)x(Si8-x Alx(Mg, Fe)6O20, 8H₂O of varying typical analyses.
Hardness 1.6 Density 2.3-2.7 Water insoluble
Used principally in refractory materials for purposes of insulation.

By Tony Hansen
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