Rock crystal is another name for Quartz, and is colorless, has little to no clevage, and has a silicon-oxygen framework.  

Objects: Rock Crystal Export: JSON - XML - CSV Clay Seals and Sealings

Object U Number Museum Number (UPM Date Reg Number) Museum Number (BM Registration Number) Museum Number (UPM B-number) Description (Catalog Card)
16743 31-43-46 (none) (none) Quartz cylinder. Unengraved. Unpierced. cf. U. 16606. [drawing 1:1]
18457 33-35-178 (none) (none) Cylinder seal. Milky crystal. Geometrical (?) designs in 2 registers.
6752 (none) (none) B16283 Cylinder seal. White crystal. Plain. E.
8714 (none) (none) B17033 Cylinder seal. Crystal. Two registers. Above: Male figure approaching from behind a lion? in front of the lion a fallen gazelle and in front of the gazelle a winged dragon. Below: A winged dragon, and second similar? and a rampant gazelle?
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Related Terms

Amethyst