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Start Over Object class Mineral and rock samples Collector Mrs. D. Riddell
Hearst Museum object titled Crystal fragment, accession number 1-177881, described as Quartz.
Hearst Museum object titled Pumice, accession number 1-177764, described as Pumice.
Hearst Museum object titled Pumice, accession number 1-177843, described as Pumice.
Hearst Museum object titled Pumice fragment, accession number 1-178092, described as Pumice fragment.
Hearst Museum object titled Pumice fragments, accession number 1-188272, described as Pumice fragments

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