Pegmatite
Pegmatite is a coarse-grained rock, composed mainly of feldspar, quartz and mica, which forms in the later stages of the cooling of a magma. In ceramics, pegmatite is used as a flux because of its ability to lower the melting point of glazes and improve the melting of ceramic mixtures. By acting as a flux, pegmatite facilitates the vitrification of glazes, allowing them to melt at lower temperatures, which not only reduces energy consumption during firing, but also improves the efficiency of the process.
Pegmatite is appreciated in the production of decorative and utilitarian ceramics, where a resistant, high quality, low melting point glaze is required. Its presence in clay bodys and glazes contributes to the mechanical strength of fired pieces, making them better able to withstand extreme thermal conditions.Interesting Fact
Pegmatite also contains rare and precious minerals such as quartz, feldspar and sometimes gems, making it valuable in both the ceramic and jewelry industries. In ceramics, its feldspar content makes it an excellent flux for high quality glazes.Helpful Tip
If you are experiencing problems with the vitrification of your glazes, try incorporating pegmatite into the formula. Conduct several test firings to adjust the proper amount according to the temperature of your kiln and the type of clay you are using.
