Reidite

General
Category| Zircon group
Formula
(repeating unit)| ZrSiO4
Strunz classification| 9.AD.45
Crystal system| Tetragonal
Crystal class| Dipyramidal (4/m)
H-M symbol: (4/m)
Space group| I41/a
Unit cell| a = 4.738, c = 10.506 [Å], Z = 4
Identification
Formula mass| 183.31 g/mol
Color| Colorless to white
Crystal habit| Epitaxial - crystallographic alignment with a precursor mineral, occurs as inclusions in other minerals.
Cleavage| None
Fracture| Irregular/uneven
Tenacity| Brittle
Mohs scale hardness| 7.5
|re|er}}| Adamantine
Streak| White
Diaphaneity| Translucent
Specific gravity| 5.16
Optical properties| Uniaxial (+)
Refractive index| nω=1.64, nε=1.655
Birefringence| 0.0150
Pleochroism| None
References| [1][2]

Reidite is a rare polymorph of ZrSiO4 created when zircon experiences high pressure and temperature. Reidite is denser than zircon and has the same crystal structure as scheelite. All natural occurrences of reidite are associated with meteorite impact events.

On Earth, reidite has been reported from ten impact structures: the Chesapeake Bay Crater in Virginia; Ries Crater in Germany; Xiuyan Crater in China; Woodleigh Crater in Western Australia;[4] Rock Elm Crater in Wisconsin;[5] Dhala Crater in India;[6] Stac Fada in Scotland; Haughton in Canada; Steen River in Canada, and Rochechouart in France. Reidite has also been found in one lunar meteorite.[7]

## Contents

* 1 Name origin and discovery
* 2 Occurrence
* 3 Related silica minerals
* 4 See also
* 5 References
* 6 External links

## Name origin and discovery

Reidite is named after Alan F. Reid, the scientist who first synthesized it during high-pressure experiments in the laboratory in 1969.[8]

Reidite was first discovered in natural samples by B.P. Glass and Shaobin Liu in 2001.[9]

## Occurrence

Reidite is formed from zircon above ~30GPa in shock recovery experiments. However, the temperatures generated during meteorite impacts are much higher, and reidite can be formed down to ~9GPa under natural impact conditions.[10] Reidite has been found in lamellar, granular, and dendritic forms within host zircon, typically making up less than 10% of the grain. Reidite from Rochechouart impact structure has also been reported as bladed, wedged, and massive.[11]

Libyan desert glass may show lattice deformation in zircon that is interpreted as evidence of this material having previously contained reidite, and as such constitutes strong evidence for its impact origin.[12]

## Related silica minerals

Relationship of Reidite to Other Specimens  9.AD.25 | Uvarovite | Ca3Cr2(SiO4)3

|
|

9.AD.25 | Wadalite | (Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3
9.AD.25 | Holtstamite | Ca3(Al,Mn3+)2(SiO4)2(OH)4
9.AD.25 | Kerimasite | Ca3Zr2(SiO4)(Fe3+O4)2
9.AD.25 | Toturite | Ca3Sn2(SiO4)(Fe3+O4)2
9.AD.25 | Momoiite | (Mn2+,Ca)3V23+(SiO4)3
9.AD.25 | Eltyubyuite | Ca12Fe103+Si4O32Cl6
9.AD.25 | Hutcheonite | Ca3Ti2(SiAl2)O12
9.AD.30 | Coffinite | (U4+,Th)(SiO4)1-x(OH)4x
9.AD.30 | Hafnon | HfSiO4
9.AD.30 | Thorite | (Th,U)SiO4
9.AD.30 | Zircon | ZrSiO4
9.AD.30 | Stetindite | Ce4+SiO4
9.AD.35 | Huttonite | ThSiO4
9.AD.35 | Tombarthite-(Y) | Y4(Si,H4)4O12−x(OH)4+2x
9.AD.40 | Eulytine | Bi4(SiO4)3

## See also

* List of minerals

## References

1. ↑ "Reidite". Hudson Institute of Mineralogy. http://www.mindat.org/min-11467.html. Retrieved 18 March 2015.
2. ↑ "Reidite Mineral Data". https://webmineral.com/data/Reidite.shtml#.VQivio7F-So. Retrieved 18 March 2015.
3. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
4. ↑ Discovery of reidite, one of the rarest minerals on Earth, may reveal Australia's biggest crater ABC News, 16 October 2018. Retrieved 17 October 2018.
5. ↑ Oskin, Becky (3 November 2014). "Rare Mineral Discovered in Ancient Meteorite Impact Crater". Livescience. https://www.livescience.com/48584-reidite-discovered-rock-elm-wisconsin.html. Retrieved 24 March 2015.
6. ↑ Li, Shan-Shan; Keerthy, S.; Santosh, M.; Singh, S.P.; Deering, C.D.; Satyanarayanan, M.; Praveen, M.N.; Aneeshkumar, V. et al. (February 2018). "Anatomy of impactites and shocked zircon grains from Dhala reveals Paleoproterozoic meteorite impact in the Archean basement rocks of Central India". Gondwana Research 54: 81–101. doi:10.1016/j.gr.2017.10.006. Bibcode: 2018GondR..54...81L.
7. ↑ Xing, Weifan; Lin, Yangting; Zhang, Chi; Zhang, Mingming; Hu, Sen; Hofmann, Beda A.; Sekine, Toshimori; Xiao, Long et al. (2020-11-16). "Discovery of Reidite in the Lunar Meteorite Sayh al Uhaymir 169" (in en). Geophysical Research Letters 47 (21). doi:10.1029/2020GL089583. ISSN 0094-8276. Bibcode: 2020GeoRL..4789583X. https://onlinelibrary.wiley.com/doi/10.1029/2020GL089583.
8. ↑ Reid, A. F.; Ringwood, A. E. (1969-06-01). "Newly observed high pressure transformations in Mn3O4, CaAl2O4, and ZrSiO4" (in en). Earth and Planetary Science Letters 6 (3): 205–208. doi:10.1016/0012-821X(69)90091-0. ISSN 0012-821X. https://dx.doi.org/10.1016/0012-821X(69)90091-0.
9. ↑ Glass, B.P.; Liu, Shaobin (2001-04-01). "Discovery of high-pressure ZrSiO4 polymorph in naturally occurring shock-metamorphosed zircons". Geology 29 (4): 371–373. doi:10.1130/0091-7613(2001)029<0371:DOHPZP>2.0.CO;2. ISSN 0091-7613. https://doi.org/10.1130/0091-7613(2001)0292.0.CO;2.
10. ↑ Timms, Nicholas E.; Erickson, Timmons M.; Pearce, Mark A.; Cavosie, Aaron J.; Schmieder, Martin; Tohver, Eric; Reddy, Steven M.; Zanetti, Michael R. et al. (2017-02-01). "A pressure-temperature phase diagram for zircon at extreme conditions" (in en). Earth-Science Reviews 165: 185–202. doi:10.1016/j.earscirev.2016.12.008. ISSN 0012-8252. Bibcode: 2017ESRv..165..185T.
11. ↑ Plan, Anders; Kenny, Gavin G.; Erickson, Timmons M.; Lindgren, Paula; Alwmark, Carl; Holm-Alwmark, Sanna; Lambert, Philippe; Scherstén, Anders et al. (October 2021). "Exceptional preservation of reidite in the Rochechouart impact structure, France: New insights into shock deformation and phase transition of zircon" (in en). Meteoritics & Planetary Science 56 (10): 1795–1828. doi:10.1111/maps.13723. ISSN 1086-9379. Bibcode: 2021M&PS...56.1795P.
12. ↑ Cavosie, Aaron J. (22 May 2019). "How we solved the mystery of Libyan desert glass" (in en). http://theconversation.com/how-we-solved-the-mystery-of-libyan-desert-glass-117253.

## External links

* List of Minerals

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