Spodumene (substitute) is a silicate mineral often referred to as lithium feldspar. Commonly used in ceramics as a source of lithia which is used as a powerful flux especially when used with potash and soda feldspars. As one of only a few natural lithium source materials, spodumene is a valuable component in glass and ceramic/enamel glazes reducing thermal expansion, melting temperature and viscosity of the glaze melt. Useful to prevent crazing. It also affects glaze colour, promoting blue from copper and pink from cobalt.

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