ANALYSES OF TYPICAL CLAYS _The samples were all dried at 105° C._ +-------------------+--------+-------+---------+--------+-------+-------+ | Clay | China | Ball |Fireclay | Brick |Boulder| Marl | | | Clay | Clay | | Clay | Clay | | +-------------------+--------+-------+---------+--------+-------+-------+ | Locality |Cornwall| Dorset|Yorkshire|Midlands| Lancs.|Suffolk| +-------------------+--------+-------+---------+--------+-------+-------+ |Ultimate Analysis: | | | | | | | | Silica | 47·1 | 49·1 | 68·9 | 57·7 | 63·7 | 43·7 | | Alumina | 39·1 | 33·7 | 19·3 | 24·3 | 20·4 | 15·5 | | Ferric oxide | ·6 | 1·2 | 1·0 | 5·0 | 3·0 | 5·2 | | Titanium oxide | -- | ·2 | 1·8 | ·1 | ·2 | -- | | Lime | ·4 | ·8 | ·9 | 3·7 | 4·3 | 16·3 | | Magnesia | ·2 | ·3 | ·3 | 2·5 | 2·7 | 2·1 | | Potash and Soda | ·3 | 2·5 | ·9 | 2·8 | 2·9 | ·7 | | Carbon | 2·6 | 4·3 | 1·8 | 1·6 | ·4 | 1·6 | | Water | 9·3 | 7·7 | 4·8 | 2·0 | 2·2 | 2·4 | | Other Matter | ·4 | ·2 | ·3 | ·3 | ·2 | 12·5 | +-------------------+--------+-------+---------+--------+-------+-------+ | Total | 100·0 | 100·0 | 100·0 | 100·0 | 100·0 | 100·0 | +-------------------+--------+-------+---------+--------+-------+-------+ |Proximate Analysis:| | | | | | | | Gravel and Sand | -- | 8·4 | 4·6 | 22·1 | 23·1 | 9·2 | | Silt | -- | 4·8 | 9·0 | 3·1 | 8·4 | 16·0 | | Felspar- and mica-| | | | | | | | dust | 5·2 | 15·4 | 10·3 | 24·3 | 18·5 | 8·9 | | Silica-dust | 3·1 | 4·0 | 38·0 | 3·1 | 12·6 | 2·0 | | Free calcium | | | | | | | | carbonate | -- | -- | -- | 2·1 | ·2 | 28·4 | | Free iron oxide | | | | | | | | and pyrites | ·4 | ·9 | ·7 | 4·2 | 1·6 | 3·9 | | 'True clay' | 91·3 | 66·5 | 37·4 | 41·1 | 35·6 | 31·6 | +-------------------+--------+-------+---------+--------+-------+-------+ | Total | 100·0 | 100·0 | 100·0 | 100·0 | 100·0 | 100·0 | +-------------------+--------+-------+---------+--------+-------+-------+ For other analyses the books in the Bibliography at the end of the present volume should be consulted, particularly No. 2, _i.e._ _British Clays, Shales and Sands_.