| Monthly Tech-Tip | No tracking! No ads! | 
Texas talc contains some amorphous carbon. The carbon is not stand-alone, but as CO2 in the dolomitic part of the ore. It produces ~7% LOI between 750-850C. Even though the powder color is so much darker in the raw form, it fires whiter! But there is more going on here. On paper, both contain about 0.5% Fe2O3. But the iron species in the two talcs are different. In Texas talcs, the iron is part of the crystal lattice. But, in the Montana material, that 0.5% Fe2O3 is an external iron oxide mineral species, a physical contaminant. While the Montana material fires much darker because of this that iron seems to have little affect on the color of the raw white powder.
| Materials | Talc A source of MgO for ceramic glazes, a flux or thermal expansion additive in clay bodies, also used in the manufacture of cordierite. | 
| Materials | Pioneer 2661 Talc | 
| Materials | Amtalc-C98 | 
| Materials | Silverline 303 Talc | 
| Materials | Natural Talc C-98 | 
Buy me a coffee and we can talk