Tag Archives | chalk

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Jurassic coast

We recently visited the Dorset Jurassic coast, so named because it features layers of Jurassic limestone: 145 million year old Portland stone and Purbeck stone, as well as layers of Wealden clay, Greensand and Cretaceous chalk cliffs. Some of these layers contain fossil sea urchins and shells, and there is a even a fossil forest, with […]

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chalk and limesone, glaze material

Glaze materials

Stoneware and porcelain glazes are made up of at least four ingredients: silica, feldspar, whiting and clay.  This is what they look like in their raw mineral forms. Silica is ground flint or quartz, usually from sand or sandstone. These are large pieces of milky quartz from a vein in igneous rock. Silica has a high […]

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