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Petunse

Alternate Names: Porcelain stone, petuntse, lithium china stone

Oxide Analysis Formula
CaO 0.28% 0.03
K2O 3.30% 0.22
MgO 0.60% 0.09
Na2O 1.97% 0.20
TiO2 0.05% -
Al2O3 16.03% 1.00
SiO2 75.14% 7.96
Fe2O3 0.42% 0.02
LOI 2.21%n/a
Oxide Weight 622.24
Formula Weight 636.31

Notes

A low-iron, high quality material found in China. It forms the basis of a historic porcelain industry. The material has a chemistry similar to Cornwall Stone (15% Al2O3, 75% SiO2), it can be mixed with kaolin to produce a fine porcelain. The percentage of Petuntse required to produce a vitreous fired product means the remaining kaolin must assume the burden to produce all the plasticity (thus bodies are very non-plastic compared to western tastes). A Chinese supplier, Amanda International describes it this way (edited to English and to remove redundancy):

"Lithium porcelain stone is pure in quality, with good whiteness, high content of alkali metal oxides Li2O, K2O and Na2O. Widely used in tableware, building porcelain, sanitaryware, high white porcelain brick, ceramic glaze and frit (even in cosmetics). Lithium porcelain stone has very low content of iron and titanium. The contents of Li2O, K2O and Na2O in the composition are relatively high, which makes it have a strong melting ability. The sericite mineral content also is said to impart good plasticity (we. The material is thought to be unique to China."

The chemistry from another supplier was 68% SiO2, 18% Al2O3, 1.0% Li2O, 2.8% K2O, 3.2% Na2O, 1.4% CaO, 4% LOI.

Haicheng Bright Future Mineral (Amanda International Private Ltd) claims their material contains lithium also, imparting "strong melting ability", and that it also has good plasticity because of "large amount of sericite mineral content". They also say: "Lithium porcelain stone is widely used in daily porcelain, building porcelain, sanitary porcelain, high white porcelain brick, especially ceramic glaze and frit".

Related Information

Links

URLs https://en.wikipedia.org/wiki/Petuntse
Petuntse at Wikipedia
Also know as "porcelain stone", in China this is mixed with kaolin to produce porcelain, "Jingdezhen ware" being the most well known.
URLs https://en.wikipedia.org/wiki/Jingdezhen_porcelain
Jingdezhen Porcelain at Wikipedia
Porcelain made in China using the petuntse (porcelain stone) material.
URLs https://m.made-in-china.com/amp/product/High-Quanlity-Lithium-China-Stone-Powder-for-Building-Glass-797681522.html
Lithium China Stone from Amanda International in China
Materials Cornwall Stone
By Tony Hansen
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