Rocks and Minerals Section
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Obsidian
Obsidian

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Okenite  radial cluster of fibers with Apophyllite
Okenite radial cluster of fibers with Apophyllite

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Oligoclase
Oligoclase

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Oligoclase  variety Sunstone
Oligoclase variety Sunstone

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Olivenite  green crust of
Olivenite green crust of

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Olivine
Olivine

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Olivine  atomic structure
Olivine atomic structure

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Olivine  variety Peridot
Olivine variety Peridot

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Opal  variety Fire
Opal variety Fire

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Ordovician limestone with shale
Ordovician limestone with shale

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Orpiment
Orpiment

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Orpiment  crystal cluster
Orpiment crystal cluster

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Orpiment  monoclinic arsenic sulfide
Orpiment monoclinic arsenic sulfide

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Orthoclase
Orthoclase

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Orthoclase Hornblende
Orthoclase Hornblende

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Orthoclase  Carlsbad twinning
Orthoclase Carlsbad twinning

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Orthoclase  variety Adularia with Baveno twinning
Orthoclase variety Adularia with Baveno twinning

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Osarizawaite Hydrous Lead Copper sulfate
Osarizawaite Hydrous Lead Copper sulfate

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Osarizawaite Hydrous  Lead Copper sulfate
Osarizawaite Hydrous Lead Copper sulfate

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