La Borne Clay

Alternate Names: St. Amand Clay, GSA

Oxide	Analysis	Formula
Al2O3	19.22%	1.00
SiO2	66.30%	5.85
TiO2	0.86%	0.06
Fe2O3	1.41%	0.05
CaO	0.22%	0.02
MgO	0.15%	0.02
K2O	1.68%	0.09
Na2O	0.32%	0.03
MnO	0.02%	-
LOI	8.27%	n/a
Oxide Weight		478.58
Formula Weight		521.73

Notes

Dug in St. Amand France buy local potters for their own consumption, but Solargil (belongs to the WBB group) is digging it and retailing it as stoneware clay with the commercial name GSA .

Related Information

Links

Typecodes	Clay Other Clays that are not kaolins, ball clays or bentonites. For example, stoneware clays are mixtures of all of the above plus quartz, feldspar, mica and other minerals. There are also many clays that have high plasticity like bentonite but are much different mineralogically.

Data

Drying Shrinkage	4.8% at 19% H2O
Firing Shrinkage	11% total shrinkage at 1280Ã‚Â°C
Water absorption	0.2% water absorption (fired at 1280Ã‚Â°C)

By Tony Hansen
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