Chalcedony : CSIRO Spectroscopy Database

Chalcedony

Images

Shortwave UV photoluminescence of a specimen of chalcedony from Hidalgo Co., New Mexico. Size: 12cm

© Photo (C) 2003 James O. Hamblen (http://hamblen.ece.gatech.edu/uvminerals/). Reproduced with permission.

Photograph of a specimen of chalcedony from Hidalgo Co., New Mexico. Size: 12cm

© Photo (C) 2003 James O. Hamblen (http://hamblen.ece.gatech.edu/uvminerals/). Reproduced with permission.

Chalcedony specimen from El Paso, Texas. Size: 2 x 1.25" (5.5 cm x 3 cm). It contains trace amounts of the uranyl ion (uranium) which makes it fluoresce under short wave ultraviolet light.

© Photo (C) 2009 Hadley Paul Garland (via Wikimedia Commons), CC-BY-SA 2.0

Properties

Formula	SiO₂
Classification	Quartz, microcrystalline
Member	Onyx
Luminescence emitters	Triplet-singlet, UO2
Search other databases	webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags	Variety, Simple oxide

Composition

Element	Atoms
Si	1
O	2
Total:	3

References

Gorobets and Rogojine 2002

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Tarashchan 1978

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