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Rock Salt   One halite crystal salt (lake crystal salt) sample   Element Results % Analysis Method Moisture 0.83 ASTM E534\2003 Purity (as sodium chloride) 99.25 Water insoluble matter 0.16 Ca ++ 0.10 Mg ++ 0.04 SO4 0.31 CaSO4 0.34 MgSO4 0.09 MgCI2 0.16 Cu++ 0.006 AAS K+ 0.009