Reidite Mineral Data

General Reidite Information

Chemical Formula:

ZrSiO4

Composition:

Molecular Weight = 183.31 gm

Zirconium 49.77 % Zr 67.22 % ZrO₂

Silicon 15.32 % Si 32.78 % SiO₂

Oxygen 34.91 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zr(SiO₄)

Environment:

Inclusions in shocked zircon grains with a scheelite-type structure. Pressures of 30 GPa to 53 GPa are required for this transition.

IMA Status:

Approved IMA 2001 (Dana # Added)

Locality:

Ejecta from the Chesapeake Bay impact structure (Eocene), found in upper Eocene sediments in the continental slope off New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Alan F. Reid who first produced this high pressure phase in the laboratory.

Synonym:

IMA2001-013

Reidite Image

Images:

Reidite

Comments: Scanning electron microscope photomicrograph of the surface of an etched shocked zircon with a skeletal crystalline phase that may be reidite. X-ray diffraction data indicate that this zircon contains minor amounts of reidite. (AmMin 87:563).
Location: Found in an upper Eocene impact ejecta layer in marine sediments on the upper continental slope off New Jersey and on Barbados. Scale: See Image.
© American Mineralogist

Reidite Crystallography

Axial Ratios:

a:c = 1:2.21739

Cell Dimensions:

a = 4.738, c = 10.506, Z = 4; V = 235.85 Den(Calc)= 5.16

Crystal System:

Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: I 4₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.81(1)(112), 1.755(0.6)(204), 1.437(0.5)(132),2.065(0.5)(211), 1.55(0.45)(116), 3.29(0.4), 4.3(0.4)(101), 1.805(0.3)(213),

Physical Properties of Reidite

Cleavage:

None

Color:

White.

Diaphaneity:

Translucent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Epitaxial - Crystallographic alignment with a precursor mineral

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

7.5 - Garnet

Luster:

Adamantine

Streak:

white

Optical Properties of Reidite

Gladstone-Dale:

CI calc= 0.403 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1255,KC= 0.21
Ncalc = 2.08

Optical Data:

Uniaxial (+), w=1.64, e=1.655, bire=0.0150.

Calculated Properties of Reidite

Electron Density:

Bulk Density (Electron Density)=4.84 gm/cc
note: Specific Gravity of Reidite =5.16 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Reidite= 68.77 barns/electron
U=PE_Reidite x rElectron Density= 332.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Reidite is Not Radioactive

Reidite Classification

Dana Class:

51.05.06.01 (51)Nesosilicate Insular SiO4 Groups Only

(51.05)with cations in >[6] coordination

(51.05.06)Dana Group

51.05.06.01 Reidite! ZrSiO4 I 4₁/a 4/m

Strunz Class:

09.AD.45 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AD -Nesosilicates without additional anions;

09.AD.45 Reidite! ZrSiO4 I 4₁/a 4/m

Other Reidite Information

References:

NAME( AmMin, Vol 87, p 562) PHYS. PROP.(AmMin, Vol 87, p 562) OPTIC PROP.(AmMin, Vol 87, p 562)

See Also:

Links to other databases for Reidite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Reidite Specimen Label here :

Reidite

ZrSiO4
Dana No: 51.05.06.01 Strunz No: 09.AD.45
Locality:

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