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Reidite

Formula:
Zr[SiO
 
4
]
System:TetragonalColour:Colourless
Hardness:7½
Name:after Alan F. Reid, who first produced the phase in high-pressure laboratory experiments in 1969
Dimorph of:Zircon


Zircon Group. A high-pressure polymorph of Zircon with the scheelite structure.

Classification of Reidite

IMA status:Approved 2001
Strunz 8th edition ID:8/A.09-15
Nickel-Strunz 10th (pending) edition ID:9.AD.45

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

Co-type Localities:Deep Sea Drilling Project Site 612, Upper continental slope of New Jersey, Atlantic Ocean
Ocean Drilling Program Hole 903C, Upper continental slope of New Jersey, Atlantic Ocean
Ocean Drilling Program Hole 904A, Upper continental slope of New Jersey, Atlantic Ocean
Bath Cliff, Barbados
General Appearance of Type Material:skeletal crystals replacing zircon
Geological Setting of type material:in upper Eocene impact ejecta layer, probably from the Chesapeake Bay impact structure

Physical Properties of Reidite

Lustre:Adamantine
Colour:Colourless
Streak:white
Hardness (Mohs):7½
Tenacity:Brittle
Cleavage:None Observed
Fracture:Irregular/Uneven
Density (calculated):5.2 g/cm3

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

Epitaxial Relationships of Reidite

Epitaxial Minerals:
Zircon

Optical Data of Reidite

Type:Uniaxial
Pleochroism:Non-pleochroic

Chemical Properties of Reidite

Formula:
Zr[SiO
 
4
]
Essential elements:
All elements listed in formula:O, Si, Zr

Relationship of Reidite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.AD.05Larnite
Ca
 
2
[SiO
 
4
]
9.AD.05Calcio-Olivine
Ca
 
2
[SiO
 
4
]
9.AD.15Merwinite
Ca
 
3
Mg[SiO
 
4
]
 
2
9.AD.20Bredigite
Ca
 
7
Mg[SiO
 
4
]
 
4
9.AD.25Andradite
Ca
 
3
Fe
3+
2
[SiO
 
4
]
 
3
9.AD.25Almandine
Fe
2+
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Calderite
(Mn
2+
 
,Ca)
 
3
(Fe
3+
 
,Al)
 
2
[SiO
 
4
]
 
3
9.AD.25Goldmanite
Ca
 
3
(V
3+
 
,Al,Fe
3+
 
)
 
2
[SiO
 
4
]
 
3
9.AD.25Grossular
Ca
 
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Henritermierite
Ca
 
3
(Mn
3+
 
,Al)
 
2
[(OH)
 
4
|(SiO
 
4
)
 
2
]
9.AD.25Hibschite
Ca
 
3
Al
 
2
[(OH)
 
6-1
|(SiO
 
4
)
 
1.5-2.5
]
9.AD.25Hydroandradite
9.AD.25Katoite
Ca
 
3
Al
 
2
[(OH)
 
8-6
|(SiO
 
4
)
 
1-1.5
]
9.AD.25Kimzeyite
Ca
 
3
(Zr,Ti)
 
2
[(Si,Al,Fe
3+
 
)O
 
4
]
 
3
9.AD.25Knorringite
Mg
 
3
Cr
 
2
[SiO
 
4
]
 
3
9.AD.25Majorite
Mg
 
3
(Fe
2+
 
,Si,Al)
 
2
[SiO
 
4
]
 
3
9.AD.25Morimotoite
Ca
 
3
(Ti,Fe
2+
 
,Fe
3+
 
)
 
2
[(Si,Fe
3+
 
)O
 
4
]
 
3
 (?)
9.AD.25Pyrope
Mg
 
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Schorlomite
Ca
 
3
(Ti,Fe
3+
 
)
 
2
[(Si,Fe
3+
 
,Fe
2+
 
)O
 
4
]
 
3
9.AD.25Spessartine
Mn
2+
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Uvarovite
Ca
 
3
Cr
 
2
[SiO
 
4
]
 
3
9.AD.25Wadalite
Ca
 
6
(Al,Mg)
 
4
[Cl
 
3
|O
 
4
|{(Si,Al,Fe
3+
 
)O
 
4
}
 
3
]
9.AD.25Holtstamite
Ca
 
3
(Al,Mn
3+
 
)
 
2
(SiO
 
4
)
 
2
(OH)
 
4
9.AD.30Coffinite
(U,Th)[(OH)
 
4x
|(SiO
 
4
)
 
1-x
]
9.AD.30Hafnon
(Hf,Zr)[SiO
 
4
]
9.AD.30Thorite
(Th,U)[SiO
 
4
]
9.AD.30Thorogummite
(Th,U)[(OH)
 
4x
|(SiO
 
4
)
 
1-x
]
9.AD.30Zircon
Zr[SiO
 
4
]
9.AD.35Huttonite
Th[SiO
 
4
]
9.AD.35Tombarthite-(Y)
Y
 
4
[HSiO
 
4
]
 
3
9.AD.40Eulytine
Bi
 
4
[SiO
 
4
]
 
3

Other Names for Reidite

Synonyms:
IMA2001-013
German names:
Reidit
Russian names:
Рейдит
Spanish names:
Reidita

Other Information

Health Warning: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:Glass, B.P., S. Liu & 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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Reidite in the Natural History Museum (London) online catalogue
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    Localities for Reidite

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    The 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.
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    (TL) indicates type locality. ? 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
    Laos
     
    • Muong Nong
    Mineral and/or Locality
    Google
     
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