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Saint Rose Red

Oxide Analysis Formula
CaO 0.61% 0.07
K2O 0.14% 0.01
MgO 0.16% 0.03
Na2O 0.10% 0.01
TiO2 1.09% 0.09
Al2O3 15.94% 1.00
P2O5 0.04% 0.00
SiO2 66.45% 7.08
Fe2O3 8.44% 0.34
MnO 0.09% 0.01
Oxide Weight 595.49
Formula Weight 640.31


St. Rose red is a unique low plasticity highly iron stained refractory clay that is useful for imparting red coloration to high and medium temperature clay bodies. While many iron bearing plastic clays are on the market, almost all of these are low temperature materials and thus flux to produce brown rather than red colors and higher temperatures. St. Rose Red also contains particulate iron materials which produce a fired character at coarser mesh sizes that is unique in the industry.

Trace Elements ppm Nov 97:
Ba 167
Sr 26
Y 20
Sc 10
Zr 724
be <1
V 122

Pre Nov 97 Analysis:
CaO... 0.44%
K2O... 0.10%
MgO... 0.14%
Na2O.. 0.05%
TiO2.. 1.09%
P2O5.. 0.15%
Fe2O3. 6.91%
MnO... 0.02%
LOI... 7.00%

Related Information

Plainsman St. Rose Red fireclay fired test bars

Top to bottom: Cone 10 reduction, cone 11, 9, 8, 7 oxidation. This is a refractory material despite the fact that it is high in iron.

An iron fireclay? Yes.

The natural Plainsman St. Rose Red clay before it is ground. This has about 6% iron oxide and is used to color high temperature throwing and sculpture bodies. It is quite refractory, very unusual for a clay this high in iron. It is from St. Rose, Manitoba.

Varying sizes of iron speckle in a high-iron reduction stoneware clay

Cone 10R firing of Plainsman Fire-Red (left), St. Rose Red 42 mesh (center) and St. Rose Red 10 mesh (right). The 10 mesh material produces a reduction speckle and deep red color that is very unique.


Materials M2 Red Stoneware
Materials Fire-Red
Materials Plainsman Red Fireclay
Materials A1 Ball Clay
Materials Newman Red Clay
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.
Suppliers Plainsman Clays

By Tony Hansen

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