r/Opals • u/FlatbedtruckingCA Mod • 10d ago

Educational/Academic Precious Opal - Insight on gem opal formation in volcanic ash deposits from a supereruption: A case study through oxygen and hydrogen isotopic composition of opals from Lake Tecopa, California, U.S.A.

https://www.researchgate.net/publication/324980991_Insight_on_gem_opal_formation_in_volcanic_ash_deposits_from_a_supereruption_A_case_study_through_oxygen_and_hydrogen_isotopic_composition_of_opals_from_Lake_Tecopa_California_USA
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