Rocks and Minerals Section
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Ulexite  continuous optically active fibers
Ulexite continuous optically active fibers

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Ulexite  with clay and Realgar  hydrous Sodium Calcium borate
Ulexite with clay and Realgar hydrous Sodium Calcium borate

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Umber  raw pigment
Umber raw pigment

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Uraninite
Uraninite

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Uranophane
Uranophane

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ultramarine  natural pigment
ultramarine natural pigment

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