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Reidite

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Formula:
ZrSiO4
System:
Tetragonal
Colour:
Colourless
Hardness:
Name:
Named in 2002 by Billy P. Glass, Shaobin Liu, and Peter B. Leavens in honor of Alan F. Reid, who first produced the phase in high-pressure laboratory experiments in 1969.
Dimorph of:
Zircon Group. A high-pressure polymorph of Zircon with the scheelite structure.

Classification of Reidite

Approved 2001
9.AD.45

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
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First Recorded Occurrence of Reidite

General Appearance of First Recorded Material:
skeletal crystals replacing zircon
Geological Setting of First Recorded Material:
in upper Eocene impact ejecta layer, probably from the Chesapeake Bay impact structure

Physical Properties of Reidite

Adamantine
Colour:
Colourless
Streak:
white
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
5.2 g/cm3 (Calculated)

Crystallography of Reidite

Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
I41/a
Cell Parameters:
a = 4.738Å, c = 10.506Å
Ratio:
a:c = 1 : 2.217
Unit Cell Volume:
V 235.84 ų
Z:
4
Morphology:
skeletal crystals up to 10 µm in length and 0.3 µm in width; also lamellar intergrowths in host zircon crystals.

Epitaxial Relationships of Reidite

Epitaxial Minerals:
ZirconZrSiO4

Optical Data of Reidite

Type:
Uniaxial
Pleochroism:
Non-pleochroic

Chemical Properties of Reidite

Formula:
ZrSiO4
Essential elements:
All elements listed in formula:

Relationship of Reidite to other Species

9.AD.05LarniteCa2SiO4
9.AD.10Calcio-olivineCa2SiO4
9.AD.15MerwiniteCa3Mg(SiO4)2
9.AD.20BredigiteCa7Mg(SiO4)4
9.AD.25AndraditeCa3Fe23+(SiO4)3
9.AD.25AlmandineFe32+Al2(SiO4)3
9.AD.25Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3
9.AD.25GoldmaniteCa3V23+(SiO4)3
9.AD.25GrossularCa3Al2(SiO4)3
9.AD.25HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4
9.AD.25HibschiteCa3Al2(SiO4)3-x(OH)4x
9.AD.25HydroandraditeCa3Fe23+(SiO4)3-x(OH)4x
9.AD.25KatoiteCa3Al2(SiO4)3-x(OH)4x
9.AD.25KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3
9.AD.25KnorringiteMg3Cr2(SiO4)3
9.AD.25MajoriteMg3(Fe2+,Si,Al)2(SiO4)3
9.AD.25MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3
9.AD.25PyropeMg3Al2(SiO4)3
9.AD.25SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
9.AD.25SpessartineMn32+Al2(SiO4)3
9.AD.25UvaroviteCa3Cr2(SiO4)3
9.AD.25Wadalite(Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3
9.AD.25HoltstamiteCa3(Al,Mn3+)2(SiO4)2(OH)4
9.AD.25KerimasiteCa3Zr2(SiO4)(Fe3+O4)2
9.AD.25ToturiteCa3Sn2(SiO4)(Fe3+O4)2
9.AD.25Momoiite(Mn2+,Ca)3V23+(SiO4)3
9.AD.25EltyubyuiteCa12Fe103+Si4O32Cl6
9.AD.25HutcheoniteCa3Ti2(SiAl2)O12
9.AD.30Coffinite(U4+,Th)(SiO4)1-x(OH)4x
9.AD.30HafnonHfSiO4
9.AD.30Thorite(Th,U)SiO4
9.AD.30ZirconZrSiO4
9.AD.30StetinditeCe4+SiO4
9.AD.35HuttoniteThSiO4
9.AD.35Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2x
9.AD.40EulytineBi4(SiO4)3

Other Names for Reidite

Name in Other Languages:
German:Reidit
Russian:Рейдит
Spanish:Reidita

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.

References for Reidite

Reference List:
Reid, Alan F. and Ringwood, A. E. (1969) Newly Observed high pressure transformations in Mn3O4 , CaAl2O4 , and ZrSiO4. Earth and Planetary Science Letters, v. 6, p. 205-208.
Glass, Billy P., Shaobin Liu, and P. B. Leavens (2002) Reidite: An impact-produced high-pressure polymorph of zircon found in marine sediments.- American Mineralogist: 87: 562-565.

Internet Links for Reidite

Localities for Reidite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Atlantic Ocean
 
  • Upper continental slope of New Jersey
B.P. Glass, S. Liu & P.B. Leavens (2002) Amer. Mineral. 87, 562-565
B.P. Glass, S. Liu & P.B. Leavens (2002) Amer. Mineral. 87, 562-565
B.P. Glass, S. Liu & P.B. Leavens (2002) Amer. Mineral. 87, 562-565
Barbados
 
B.P. Glass, S. Liu & P.B. Leavens (2002) Amer. Mineral. 87, 562-565
China
 
  • Liaoning Province (Manchuria; Dongbei Region)
    • Anshan Prefecture
      • Xiuyan Co.
        • Pianling
Chen, M., Yin, F., Li, X., Xie, X., Xiao, W., & Tan, D. (2013). Natural occurrence of reidite in the Xiuyan crater of China. Meteoritics & Planetary Science.
Germany
 
  • Bavaria
    • Swabia
Gucsik, A. (2006). Identification of Reidite from the Ries Impact Crater Using Micro-Raman Spectroscopy: A Review. Meteoritics and Planetary Science Supplement, 41, 5103.
USA
 
  • Wisconsin
    • Pierce Co.
      • Rock Elm
French, Bevan, Cordua, W.S. & Plescia, Jeff (2004) The Rock Elm Meteorite Impact Structure, Wisconsin: Geology and Shock Metamorphic Effects in Quartz: Geological Society of America Bulletin, vol. 116(1): 200-218. Cavosie, A.J, Erickson, T.M., & Timms, N.E. (2014) Reidite and shock-twinned zircon in polymict breccia from the Ordovician Rock Elm impact structure, USA: Geological Society of America: Annual Meeting: Abstracts with Programs, vol. 46, no. 6.
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