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Mother Nature's porcelain - From a Cretaceous dust storm!
During a 6 week of mining in 2018 in Ravenscrag, Saskatchewan we extracted marine sediment layers of the late Cretaceous period. The center portion of the "B layer", as we call it, is so fine that it may have been wind-transported (impossibly smooth, like a body that is pure terra sigillata)! The feldspar and silica are built-in, producing the glassiest body surface I have ever seen, starting at cone 4 and lasting to cone 8. Despite this, pieces are not warping in the firings! I have not glazed the outside of this mug for demo purposes. I got away with it this time because the Ravenscrag clear glaze GR6-A is very compatible (the thermal expansion is high enough to avoid glaze compression issues and low enough not to craze). With other less compatible glazes these mugs cracked when I poured in hot coffee. To make this body I am slurrying it up as a slip and processing it to 325 mesh (using a vibrating sieve).
Related Pictures
Clay in "dinosaur country" of southern Saskatchewan
This is a "badlands" slope in the Frenchman river valley. The valley exposes the "Whitemud Formation" in many places (clearly visible here half way down on the left). Two surface mines of Plainsman Clays are nearby (over the top and down the other side), in a place where lower-lying rolling hills leave much less over-burden to remove. These materials were laid down as marine sediments during the Cretaceous period. The skeleton of the world's largest T.Rex, dubbed "Scotty", was found 50km east of here (in the layers just above the Whitemuds). Where are the layers of Scotty's ancestors from the Jurassic period? Straight down until you hit the bed rock!
Mother Nature's stoneware and glaze!
Of all the pieces I make, ones like these mean the most to me. To make this mug I slake and slurry up raw lump Plainsman MNS clay and process it through a 325 mesh vibrating sieve. This natural porcelain vitrifies to zero porosity at cone 6, yielding incredibly strong ware. I make these outside and inside glazes, GA6-C and GA6-B, from clays we mine in Montana and Alberta. Using glaze chemistry I can maximize the clay percentage to more than 70% of the recipe (for firing at 2200F).
Links
| Materials |
B Clay
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| Projects |
Mother Nature's Porcelain - Plainsman 3B
This Saskatchewan clay contains natural feldspar, quartz and a variety of clay minerals, all blended by nature, to produce a porcelain, that although not white-burning, rivals or exceeds the strength achievable using industrial imported minerals |
| Articles |
How to Find and Test Your Own Native Clays
Some of the key tests needed to really understand what a clay is and what it can be used for can be done with inexpensive equipment and simple procedures. These practical tests can give you a better picture than a data sheet full of numbers. |
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