Gemmology
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Specimens of gemstones by colour: grey [gallery view] (Page 3)

Opal — specimen 0715
Opal — specimen 0716
Opal — specimen 0717
Opal — specimen 0718
Opal — specimen 0721
Opal — specimen 0347
Moonstone — specimen 0096
Moonstone — specimen 0366
Moonstone — specimen 0360
Sanidine — specimen 0017
Labradorite — specimen 0677
Psilomelane — specimen 0724
Psilomelane — specimen 0725
Psilomelane — specimen 0323
Hematite — specimen 0031
Hematite — specimen 0405
Hematite — specimen 0407
Hematite — specimen 0440
Hematite — specimen 0171

Specimens of gemstones by colour: grey — 59
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The specimens illustrated in this site do not exist in the collections of the National Museum of Natural History, Sofia.