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Opal image.
Opal
 Sample #: V6347
Variety: Jelly
Opal image.
Opal
 Sample #: V964
Variety: hyalite
Opal image.
Opal
 Sample #: V966
Variety: hyalite
Orpiment image.
Orpiment
 Sample #: V2132
Variety:
Orpiment image.
Orpiment
 Sample #: V2133
Variety:
Orpiment image.
Orpiment
 Sample #: V2134
Variety:
Orpiment image.
Orpiment
 Sample #: V4303
Variety:
Orthoclase image.
Orthoclase
 Sample #: V081
Variety:
Orthoclase image.
Orthoclase
 Sample #: V1157
Variety:
Orthoclase image.
Orthoclase
 Sample #: V1845
Variety:
Orthoclase image.
Orthoclase
 Sample #: V1846
Variety:
Orthoclase image.
Orthoclase
 Sample #: V1847
Variety:
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