Meteorite testing Washington University in St. Louis
Actlabs requests a 5gram sample (a US nickel weighs 5 grams). They can do the analysis on as little as 1 gram, however, if you request "no LOI" (loss on ignition,, % weight loss when the sample is heated to a high temperature). LOI is sometimes useful, but never critical, for determining whether or not a rock is a meteorite.
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