This online mineral identification key has helped me ID quite a few mystery lumps:
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http://www.minsocam.org/msa/collectors_corner/id/mineral_id_keyq1.htm
Homefire, Selsun blue contains salicylic acid. Is the acid the main cause for the color reaction with silver?
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http://www.thunting.com/smf/index.php/topic,34719.msg212807.html#msg212807
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"Gold rides an iron horse." (Old prospector Homefire)
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