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Arroyo Slip

Oxide Analysis Formula
SiO2 64.00% 5.55
Al2O3 14.30% 0.73
Fe2O3 8.50% 0.28
TiO2 0.90% 0.06
MgO 3.50% 0.45
CaO 3.80% 0.35
K2O 3.50% 0.19
Oxide Weight 513.72
Formula Weight 513.72


It is a low-melting iron stained clay (hits zero porosity around cone 1). Very plastic (11% drying shrinkage) and slow drying (Albany Slip, by contrast, is non plastic and fast drying). Alberta Slip is more plastic than Albany, but not nearly as plastic as this.

Related Information

Arroyo Slip powder

Melt fluidity of Albany Slip vs. Arroyo Slip at cone 10R

Arroyo Slip fired test bars show its fired maturity at low temperatures

Fired at cone 01, 02, 03, 06 (top to bottom).


Materials Albany Slip
Materials Alberta Slip
Materials Jasper Slip
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.

By Tony Hansen

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