The front tile was fired vitreous and strong at cone 01 (2050F) from a clay mined in Elkwater, Alberta (98Mix). It is fine grained and plastic, clean and low in soluble salts. The back tile is made from a silty clay from Ravenscrag, Saskatchewan (3D). It fires vitreous at cone 6 (2200F). The glaze on that tile is made using a high percentage of another clay similar to 98Mix, it melts at the higher temperature of 2200F. These tiles have dried and fired flat despite the fact they were made from plastic clay (rather than dust pressed).
Mother Nature's Porcelain 2 - Plainsman 3D