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Iris Quartz

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About Iris QuartzHide

A variety of Quartz

Quartz crystals displaying internal spectral colours under minor rhombohedral faces. This interference phenomenon is due to reflection and refraction on extremely thin parallel Brazil-law twinning lamellae or periodic etching of defects on z faces, resulting in a diffraction grating (Lin & Heaney, 2017). The quartz crystals themselves are generally colourless or faintly amethystine or citrine, and almost always from vugs in basalt or other trap rock.


Visit gemdat.org for gemological information about Iris Quartz.

Pronounciation of Iris QuartzHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Chemical Properties of Iris QuartzHide


Synonyms of Iris QuartzHide

Other Language Names for Iris QuartzHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Ferruginous Quartz2 photos of Iris Quartz associated with Ferruginous Quartz on mindat.org.
Quartz2 photos of Iris Quartz associated with Quartz on mindat.org.
Amethyst1 photo of Iris Quartz associated with Amethyst on mindat.org.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Iris QuartzHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
C.V. Raman (1950) 
Crystals of quartz with iridescent faces
. Proceedings of the Indian Academy of Sciences, Section A, 31, 275-279.
Xiayang Lin and Peter J. Heaney (2017): Causes of iridescence in natural quartz. Gems & Gemology, 53, 68-81.

Internet Links for Iris QuartzHide

Localities for Iris QuartzHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Rhineland-Palatinate
    • Kusel
Klaus Schäfer specimen, studied by Si and Ann Frazier.
  • Madhya Pradesh
Kazuhiro Yoshida, pers. comm.
  • Maharashtra
British Museum of Natural History, specimen # BM 55795.
  • Marrakesh-Safi
    • El Kelaâ des Sraghna Province
Specimen in Spirifer Society Collection, Poland
Jack Lowell specimens, studied by John Koivula, GIA.
Mineral and/or Locality  
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