Chalcedony : CSIRO Spectroscopy Database

Chalcedony [ SiO₂ ]

Images of Chalcedony

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

Material 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 for Chalcedony

Gorobets and Rogojine 2002

0

0

0

0

2

Tarashchan 1978

0

0

Specimens of Chalcedony

Name	Owner	Materials	Image
Chalcedony (#2, Hidalgo)	Hamblen, Prof James O., Georgia Tech	Chalcedony	Chalcedony (#2, Hidalgo) 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.