| Monthly Tech-Tip | No tracking! No ads! | 
The stoneware is made from sedimentary clays mined in a in southwestern Saskatchewan quarry, they have a higher quartz grain content and enough natural feldspar to produce functional density (the practical porosity is about 2.5%). The porcelain on the right is a 45:35:20 kaolin:feldspar:silica blend (there is enough feldspar for about 0.5% porosity). The stoneware has more quartz particles to impose their high thermal expansion because fewer are taken into solution by the feldspar. That means that the body has a whole can put the squeeze on the glaze to prevent it from crazing.
| Minerals | Quartz Quartz is the most abundant mineral on earth, it is the main crystalline mineral form of silica (SiO | 
| Troubles | Glaze Crazing Ask the right questions to analyse the real cause of glaze crazing. Do not just treat the symptoms, the real cause is thermal expansion mismatch with the body. | 
Buy me a coffee and we can talk