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This is being sold as an equivalent to old G200 Feldspar (the old mine of the latter is being closed during 2013 because the deposit is depleted).
It is 70% K Feldspar, 23% Na Feldspar, 7% quartz.
Particle size:
+200 mesh: 0.5%
+325 mesh: 6.2%
On paper the chemistry is pretty similar to G-200.
– A potassium based feldspar used as a flux in high temperature glaze and clay body formulas.
