Global InformationReidite information
| Reidite | |
|---|---|
| General | |
| Category | Zircon group |
| Formula (repeating unit) | ZrSiO4 |
| IMA symbol | Rei[1] |
| 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 |
| Luster | 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 | [2][3] |
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]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ "Reidite". mindat.org. Hudson Institute of Mineralogy. Retrieved 18 March 2015.
- ^ "Reidite Mineral Data". Webmineral.com. Retrieved 18 March 2015.
- ^ 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.
- ^ Oskin, Becky (3 November 2014). "Rare Mineral Discovered in Ancient Meteorite Impact Crater". Livescience.com. Livescience. Retrieved 24 March 2015.
- ^ Li, Shan-Shan; Keerthy, S.; Santosh, M.; Singh, S.P.; Deering, C.D.; Satyanarayanan, M.; Praveen, M.N.; Aneeshkumar, V.; Indu, G.K. (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. Bibcode:2018GondR..54...81L. doi:10.1016/j.gr.2017.10.006.
- ^ Xing, Weifan; Lin, Yangting; Zhang, Chi; Zhang, Mingming; Hu, Sen; Hofmann, Beda A.; Sekine, Toshimori; Xiao, Long; Gu, Lixin (2020-11-16). "Discovery of Reidite in the Lunar Meteorite Sayh al Uhaymir 169". Geophysical Research Letters. 47 (21). Bibcode:2020GeoRL..4789583X. doi:10.1029/2020GL089583. ISSN 0094-8276. S2CID 226337486.