Donnayite-(Y) Mineral Data

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.

Name Pronunciation:

Donnayite-(Y) + Pronunciation

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 - Pedial H-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

Diaphaneity:

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= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1919,KPDmeas= 0.1873,KC= 0.1882
Ncalc = 1.61 - 1.62

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:

Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Donnayite-(Y) =3.30 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Donnayite-(Y) is Not Radioactive

Donnayite-(Y) Classification

Dana Class:

15.03.04.01 (15)Hydrated Carbonates

(15.03)where A+m B++n (XO3)p ï¿½ x(H2O), (m+n):p = 1:1 and containing U, Th, Zr, Y

(15.03.04)Mckelveyite Group

15.03.04.01 Donnayite-(Y) Sr3NaCaY(CO3)6•3(H2O) P1 1

15.03.04.02 Mckelveyite-(Y) NaCa(Ba,Sr)3(Y,REE)(CO3)6•3(H2O) Cc m

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

15.03.04.04 Weloganite Sr3Na2Zr(CO3)6•3(H2O) P1 1

Strunz Class:

05.CC.05 05 - CARBONATES (NITRATES)

05.C - Carbonates without Additional Anions, with H2O

05.CC -With rare-earth elements (REE)

05.CC.05 Donnayite-(Y) Sr3NaCaY(CO3)6•3(H2O) P1 1

05.CC.05 Mckelveyite-(Nd)* (Ba,Sr)(Ca,Na,Nd,REE)(CO3)2•3-10(H2O) P1 1

05.CC.05 Mckelveyite-(Y) NaCa(Ba,Sr)3(Y,REE)(CO3)6•3(H2O) Cc m

05.CC.05 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 - EUROmin Project
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Donnayite-(Y)

Sr3NaCaY(CO3)6•3(H2O)
Dana No: 15.03.04.01 Strunz No: 05.CC.05
Locality:

Notes:

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