Halite (NaCl) and hydrohalite (NaCl·2H2 O) have been found in the bottom sediments of Lake Bonney. These salts are in contact with the hypersaline bottom waters of the lake at depths below 28 m and occur with gypsum and calcite; a porous algal mat may be growing on at least a portion of the deposit. Hydrohalite formed during the coldest parts of the year is believed to be converted to halite during the slight warming during the austral summer. Thus, hydrohalite is only present on a year-to-year basis, whereas halite is preserved for long periods.

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