Gittinsite Mineral Data

Gittinsite Mineral Data +

General Gittinsite Information

Chemical Formula:

CaZrSi2O7

Composition:

Molecular Weight = 299.47 gm

Calcium 13.38 % Ca 18.73 % CaO

Zirconium 30.46 % Zr 41.15 % ZrO₂

Silicon 18.76 % Si 40.13 % SiO₂

Oxygen 37.40 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaZrSi₂O₇

IMA Status:

Approved IMA 1980

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 203131

IMA1970-034

PDF 33-322

Gittinsite Image

Images:

Gittinsite Eudialyte

Comments: White crystalline gittinsite with red eudialyte.
Location: Kipiwa Complex, Villedieu Township, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gittinsite Crystallography

Axial Ratios:

a:b:c =0.7929:1:0.5415

Cell Dimensions:

a = 6.878, b = 8.674, c = 4.697, Z = 2; beta = 101.74° V = 274.36 Den(Calc)= 3.62

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.155(1), 3.026(0.8), 3.232(0.8),

Crystal Structure:

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Roelofsen-Ahl J N , Peterson R C , The Canadian Mineralogist , 27 (1989) p.703-708, Gittinsite: A modification of the thortveitite structure

Physical Properties of Gittinsite

Cleavage:

None

Color:

Lemon white.

Density:

3.62

Hardness:

3.5-4 - Copper Penny-Fluorite

Streak:

white

Optical Properties of Gittinsite

Gladstone-Dale:

CI meas= 0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.202,KPDmeas= 0.202,KC= 0.2096

Optical Data:

Biaxial (-), a=1.72, b=1.736, g=1.738, bire=0.0180, 2V(Calc)=38, 2V(Meas)=30.

Calculated Properties of Gittinsite

Electron Density:

r_electron=3.48 gm/cc
note: r_Gittinsite=3.62 gm/cc.

Fermion Index

Fermion Index = 0.04329
Boson Index = 0.95671

Photoelectric:

PE_Gittinsite= 43.15 barns/electron
U=PE_Gittinsite x r_electron= 150.22 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gittinsite is Not Radioactive

Gittinsite Classification

Dana Class:

55.2.1a.1 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.2)with cations in [6] coordination

(55.2.1a)Thortveitite group

55.2.1a.1 Gittinsite CaZrSi2O7 C 2/m 2/m

55.2.1a.2 Keiviite-(Y) (Y,Yb)2Si2O7 C 2/m 2/m

55.2.1a.3 Keiviite-(Yb) (Yb,Y)2Si2O7 C 2/m 2/m

55.2.1a.4 Thortveitite (Sc,Y)2Si2O7 C 2/m 2/m

Strunz Class:

VIII/C.01-15 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.01 - Thortveitite - Rowlandite-(Y) series

VIII/C.01-10 Thortveitite (Sc,Y)2Si2O7 C 2/m 2/m

VIII/C.01-15 Gittinsite CaZrSi2O7 C 2/m 2/m

VIII/C.01-18 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1

VIII/C.01-20 Keiviite-(Y) (Y,Yb)2Si2O7 C 2/m 2/m

VIII/C.01-30 Keiviite-(Yb) (Yb,Y)2Si2O7 C 2/m 2/m

VIII/C.01-40 Yttrialite-(Y) (Y,Th)2Si2O7 P 2₁/m 2/m

VIII/C.01-45 Percleveite-(Ce)! (Ce,La,Nd)2Si2O7 P 4₁ 4

VIII/C.01-50 Rowlandite-(Y) Y4FeSi4O14F2(?) None

Other Gittinsite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Gittinsite

CaZrSi2O7
Dana No: 55.2.1a.1 Strunz No: VIII/C.01-15
Locality:

Notes: