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Rainbow Garnet
A variety of Andradite
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About Rainbow Garnet
Formula:
Ca3Fe3+2(SiO4)3
A trade name for a variety of andradite showing a distinct iridescence in rainbow colours.
The iridescence is caused by the interference of white light with an overgrowth built of very thin lamellae, oriented parallel to {110} or other crystal faces. These lamellae have compositions close to the end-member andradite composition which alternate with lamellae with a grossular-enriched composition.
The iridescence is caused by the interference of white light with an overgrowth built of very thin lamellae, oriented parallel to {110} or other crystal faces. These lamellae have compositions close to the end-member andradite composition which alternate with lamellae with a grossular-enriched composition.
Unique Identifiers
Mindat ID:
56015 (as Rainbow Garnet)
223 (as Andradite)
223 (as Andradite)
Long-form identifier:
mindat:1:1:56015:5 (as Rainbow Garnet)
mindat:1:1:223:5 (as Andradite)
mindat:1:1:223:5 (as Andradite)
Chemistry of Rainbow Garnet
Mindat Formula:
Ca3Fe3+2(SiO4)3
Element Weights:
Elements listed:
Synonyms of Rainbow Garnet
Common Associates
Associations Based on Photo Data:
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Rainbow Garnet
mindat.org URL:
https://www.mindat.org/min-56015.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
References for Rainbow Garnet
Reference List:
Akizuki, Mizuhiko, Nakai, Hiroto, Suzuki, Teruo (1984) Origin of iridescence in grandite garnet. American Mineralogist, 69 (9-10) 896-901
Hainschwang, Thomas, Notari, Franck (2006) The Cause of Iridescence in Rainbow Andradite From Nara, Japan. Gems & Gemology, 42 (4). 248-258 doi:10.5741/gems.42.4.248
Localities for Rainbow Garnet
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
China | |
| www.mindat.org (n.d.) |
Japan | |
| NAKAMURA et al. (2017) +1 other reference |
Niger | |
| Weiß et al. (2022) |
| Weiß et al. (2022) |
Kohse mine, Tenkawa village, Yoshino district, Nara Prefecture, Japan