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- Title
Dyed Blue CHALCEDONY Detected by UV-Vis-NIR Spectroscopy.
- Authors
Inns, Alethea
- Abstract
The article presents information on dyed blue chalcedony detected by ultraviolet-vis-near infrared spectroscopy. The bead was brought to the West Coast laboratory and examination showed refractive indices of 1.539-1.550, a granular fracture and a slightly banded structure identified the bead as chalcedony. The presence of dye was evident in color concentrations around the drill holes. Standard nondestructive gemological tests are often not enough to determine the presence of a copper-based dye in blue chalcedony.
- Subjects
GEMS &; precious stones; MINERALS; MINERALOGY; SILICA; COPPER; NEAR infrared spectroscopy
- Publication
Gems & Gemology, 2007, Vol 43, Issue 3, p245
- ISSN
0016-626X
- Publication type
Article