A 2005 work has shown that the slip is a matrix of mainly silicon and aluminium oxides, within which are suspended sub-microscopic crystals of haematite and corundum.
42.
Some of the individual stones of structure 1 were painted in yellows, reds and oranges using ochre pigment made of haematite mixed with animal fat, milk or eggs.
43.
A haematite cylinder seal of his servant and scribe Iliaka-um ul, son of S�n-ennam, has come to light from this city, suggesting prolonged occupation.
44.
He is further credited with optimising the yield of Haematite and Spathic iron ore from a fragmented patchwork of lodes in ground which was often soft, wet and difficult.
45.
Between 1871 and 1874, 940 tons of brown haematite were produced and it is thought that the ladders and steps to the beach were needed to reach the mine workings.
46.
Other examples of their use include reducing minerals like haematite to powder, for pigment, and crushing of hard nuts, such as hazel nuts, to extract the edible kernels.
47.
There is also iron in the leach product from the strong acid leach, which is removed in an intermediate step, in the form of goethite, jarosite, and haematite.
48.
Lead, copper, zinc, barite, haematite, tungsten, graphite, fluorite, and coal have all been mined at different times since as early as the 12th century.
49.
Continued oxidation of violarite leads to replacement by goethite and formation of a gossanous boxwork, with nickel tending to remain as impurities within the goethite or haematite, or rarely as carbonate minerals.
50.
Iron Crag Mine operated below the crag of that name from around 1864 to 1896.500 tons of haematite ore was raised in 1881, but the mine never proved a commercial success.
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