. Fig. 2.âwieliczk.\ sai,t mixes, galicia. The railway station on the third level. (By courtesy of Sir Isaac Pitman &â SonSy Ltd.) an ellipse with the longer axis running north-east to south-west, that is to say that the deposits attain their maximum thickness along this line, and thin out to the north-west and south-east of it. Sylvinite exists in two beds of 3 ft. to 8 ft. thick (locally up to 17 ft.) belonging to the Tertiary period. The roof in the mines is formed of hard clay, which renders the workings watertight. The horizontal layers of the salt are coloured in most beautiful shade
. Fig. 2.âwieliczk.\ sai,t mixes, galicia. The railway station on the third level. (By courtesy of Sir Isaac Pitman &â SonSy Ltd.) an ellipse with the longer axis running north-east to south-west, that is to say that the deposits attain their maximum thickness along this line, and thin out to the north-west and south-east of it. Sylvinite exists in two beds of 3 ft. to 8 ft. thick (locally up to 17 ft.) belonging to the Tertiary period. The roof in the mines is formed of hard clay, which renders the workings watertight. The horizontal layers of the salt are coloured in most beautiful shades of red, blue, and yellow, probably due to different percentages of salts which have separated out in the old salt-lake. The concentration of the Potassium Chloride is effected by immersing the Sj'lvinite in boUing Sodium Chloride brine, which dissolves Potassium Chloride only. This solution is gradually cooled for two or three days, when only important deposit in the British Isles. Its commercial value lies in the fact that it contains 90 per cent, of Strontium Sulphate, which is converted into Strontium Nitrate (by Nitric Acid) for the manufacture of fireworks and red flares. Also, another substance made from it, Strontium Hydroxide, attained by. roasting the sulphate with coal and iron ore, is used for separating sugar from beet-molasses. The small white crystals of Celestine are found in masses 2 ft. thick in the red marly clay at a depth of 2 ft. to 10 ft. below the surface. In Sicily, where there are large deposits, these crystals are coloured blue, a fact which gave rise to its name. The deposits are discovered by probing the clay with large iron rods until they strike the stone. A pocket or layer is thus
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