Urostealith is a fatty or resinous substance identified by the Austrian chemist J. F. Heller in 1845 as the main constituent of some bladder stones.
[1] According to Heller's and other contemporary descriptions, urostealith is a soft brown substance, insoluble in water, sparingly soluble in alcohol and easily soluble in ether.
Upon heating it softens at first, then expands and carbonizes before melting.
[2] The circumstances that lead to their formation, as well as the composition of the substance, are still obscure, and little has been published on the topic.
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