Donnayite-(Y) Mineral Data

Donnayite-(Y) Mineral Data +

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General Donnayite-(Y) Information

Chemical Formula:

Sr3NaCaY(CO3)6·3(H2O)

Composition:

Molecular Weight = 828.93 gm

Sodium 2.77 % Na 3.74 % Na₂O

Strontium 31.71 % Sr 37.50 % SrO

Calcium 4.83 % Ca 6.76 % CaO

Yttrium 10.73 % Y 13.62 % Y₂O₃

Hydrogen 0.73 % H 6.52 % H₂O

Carbon 8.69 % C 31.86 % CO₂

Oxygen 40.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sr₃NaCaY(CO₃)₆·3(H₂O)

Environment:

Nepheline syenites.

IMA Status:

Approved IMA 1978

Locality:

Mt. St. Hilare, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Joseph Desire Hubert Donnay (1902-1994), Belgian-American-Canadian crystallographer and minereralogist and Gabrielle (Hamburger) Donnay (1920-1987), American Canadian mine ralogist, McGill Univeristy.

Synonym:

IMA1978-007

Donnayite-(Y) Image

Images:

Donnayite-(Y)

Comments: Brown micro-crystals of donnayite-(Y) covering matrix.
Location: Mont. St. Hilaire, Rouville Co., Quebec, Canada. Scale: Picture size 1.5 cm.
© Tom Loomis / Dakota Matrix

Donnayite-(Y) Crystallography

Axial Ratios:

a:b:c =1.0001:1:0.7548

Cell Dimensions:

a = 9, b = 8.999, c = 6.793, Z = 1; alpha = 102.77°, beta = 116.28°, gamma = 59.99° V = 416.61 Den(Calc)= 3.30

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: P1

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

By Intensity(I/I_o): 2.839(1), 4.368(0.7), 6.103(0.4),

Physical Properties of Donnayite-(Y)

Cleavage:

[???] Indistinct, [001] Distinct

Color:

Brown, Brownish yellow, Colorless, Gray, Gray white.

Density:

3.3

Diaphaniety:

Transparent to Translucent

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Donnayite-(Y)

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1873,KPDmeas= 0.1873,KC= 0.1882

Optical Data:

Biaxial (-), a=1.551-1.561, b=1.646, g=1.652, bire=0.0910-0.1010, 2V(Calc)=26-28, 2V(Meas)=0-20.

Calculated Properties of Donnayite-(Y)

Electron Density:

r_electron=3.14 gm/cc
note: r_{Donnayite-(Y)}=3.30 gm/cc.

Fermion Index

Fermion Index = 0.02341
Boson Index = 0.97659

Photoelectric:

PE_{Donnayite-(Y)}= 49.28 barns/electron
U=PE_{Donnayite-(Y)} x r_electron= 154.60 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Donnayite-(Y) is Not Radioactive

Donnayite-(Y) Classification

Dana Class:

15.3.4.1 (15)Hydrated Carbonates

(15.3)where A+m B++n (XO3)p · x(H2O), (m+n):p = 1:1 and containing U, Th, Zr, Y

(15.3.4)Dana Group

15.3.4.1 Donnayite-(Y) Sr3NaCaY(CO3)6·3(H2O) P1 1

15.3.4.2 Mckelveyite-(Y) Ba3Na(Ca,U)Y(CO3)6·3(H2O) P1 1

15.3.4.3 Mckelveyite-(Nd)* (Ba,Sr)(Ca,Na,Nd,REE)(CO3)2·3-10(H2O) P1 1

15.3.4.4 Weloganite Sr3Na2Zr(CO3)6·3(H2O) P1 1

Strunz Class:

V/D.04-10 V - Nitrates, Carbonates and Borates

V/D - Water-bearing carbonates without unfamiliar anions

V/D.04 - Donnayite-(Y) - Weloganite series

V/D.04-05 Ewaldite (Ba,Sr)(Ca,Na,Y,Ce)(CO3)2 P 6₃mc 6mm

V/D.04-10 Donnayite-(Y) Sr3NaCaY(CO3)6·3(H2O) P1 1

V/D.04-20 Mckelveyite-(Y) Ba3Na(Ca,U)Y(CO3)6·3(H2O) P1 1

V/D.04-25 Mckelveyite-(Nd)* (Ba,Sr)(Ca,Na,Nd,REE)(CO3)2·3-10(H2O) P1 1

V/D.04-30 Weloganite Sr3Na2Zr(CO3)6·3(H2O) P1 1

Other Donnayite-(Y) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Donnayite-(Y) :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 -Google Images 8 -Google Scholar 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas

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Donnayite-(Y)

Sr3NaCaY(CO3)6·3(H2O)
Dana No: 15.3.4.1 Strunz No: V/D.04-10
Locality:

Notes: