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Cresta BB

Alternate Names: Gulgong clay

OxideAnalysisFormula
CaO0.10%0.007
MgO0.50%0.049
K2O0.20%0.008
Na2O0.30%0.019
TiO21.00%0.050
Al2O325.60%1.000
SiO263.10%4.183
Fe2O30.61%0.015
LOI8.60
Oxide Weight364.21
Formula Weight398.48
If this formula is not unified correctly please contact us.

The mine at Gulgong, NSW, Australia, produced a white, plastic raw clay that was used by many people (and manufacturers) to make clay bodies of many types (especially stoneware). It was prized as the best combination of whiteness and plasticity available in the country. It has a very low iron content and very low concentration of fluxes.

In 2015 it was determined to be uneconomic by the manufacturer so not more stockpiles have been made. In addition the last of the stockpiled Gulgong clay appears to be slightly different (less white and plastic). As a result companies had to reformulate their bodies, often the replacement being of lower quality.


Gulgong Clay from NSW, Australia

Gulgong Clay from NSW, Australia

Prized for its whiteness and plasticity. A base for many stonewares.


By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Cresta BB" descrip="" searchkey="Gulgong clay" loi="0.00" casnumber=""> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.100" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.500" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="0.200" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.300" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="1.000" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="U" percent="25.600" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="63.100" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.610" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="8.600" tolerance=""/> </volatiles> </material>


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