Sommario
What is ironstone?
Ironstone is a sedimentary rock, either deposited directly as a ferruginous sediment or created by chemical replacement, that contains a substantial proportion of an iron compound from which iron can be smelted commercially.
How much iron is in an ironstone?
Ironstones are sedimentary rocks consisting of at least 15% iron by weight, which may be quoted as 19% FeO or 21% Fe2O3 or an equivalent admixture in a chemical analysis. From: Encyclopedia of Geology, 2005
Who invented ironstone china?
It was first patented by Charles James Mason in 1813 and other manufacturers followed suit. At one point, there were almost 200 makers of ironstone china and they made everything from plates and bowls to tureens, covered casseroles, and gravy boats.
What are the characteristics of sedimentary ironstones?
Sedimentary ironstones may be hard and calcareous and contain quartz grains, ooliths, pebbles, and a wide variety of macrofossils. They are used for building locally and are characterized by their strong yellow–brown or orange–brown colours when weathered. Sign in to download full-size image 76.
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Ironstone was first patented in 1813 by Charles Mason as a cheap alternative to porcelain. A type of stoneware introduced in England early in the 19 th century by the Staffordshire potters who looked for a substitute for porcelain that could be mass-produced for the cheaper market.
When was Derbyshire ironstone made?
A variety of ironstone types was being produced by the mid-19th century. ” Derbyshire ironstone” became a particularly popular variety in the 19th century, as well as “yellow ironstone”. Patterns with raised edges became popular in the mid-19th century, including “cane-coloured” Derbyshire ironstone.
What is ironstone tableware called?
Undecorated tableware was most popular in the United States, and British potteries produced white ironstone ware, known as “White Ironstone” or “White Granite” ware, for the American market. During the mid-19th century it was the largest export market for Staffordshire’s potteries.