Mckelveyite-(Y) Mineral Data

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General Mckelveyite-(Y) Information

Chemical Formula:

NaCa(Ba,Sr)3(Y,REE)(CO3)6•3(H2O)

Composition:

Molecular Weight = 971.59 gm

Barium 39.43 % Ba 44.03 % BaO

Sodium 2.53 % Na 3.41 % Na₂O

Strontium 2.80 % Sr 3.31 % SrO

Calcium 3.92 % Ca 5.48 % CaO

La,Ce,Pr,Nd,Sm, 1.93 % RE 2.25 % REE₂O₃

Yttrium 6.77 % Y 8.60 % Y₂O₃

Hydrogen 0.62 % H 5.56 % H₂O

Carbon 7.42 % C 27.18 % CO₂

Oxygen 34.58 % O

______ ______

100.00 % 99.82 % = TOTAL OXIDE

Empirical Formula:

NaCa_0.83Na_0.07Sr_0.11Ba_2.79Sr_0.2Y_0.74REE_0.13Ca_0.12(CO₃)₆·3(H₂O)

Environment:

Eocene-aged lacustrine deposits. Hydrothermal carbonate veins in dolomite.

IMA Status:

Approved IMA 1965

Locality:

Green River Formation, Sweetwater County, Wyoming, USA and Cava Fabi Talc quarry near Lanzada, Val Malenco, Sondrio, Lombardy, Italy. Link to MinDat.org Location Data.

Name Origin:

Named after Vincent E. McKelvey, 1916-1985), director of the U.S. Geological Survey.

Name Pronunciation:

Mckelveyite-(Y) + Pronunciation

Mckelveyite-(Y) Image

Images:

Mckelveyite-(Y)

Comments: Vitreous, gray, mckelveyite crystals in matrix.
Location: Mt. Kukisvumchorr, Khibiny Massif, Kola Peninsula, Russia. Scale: Specimen Size 2.8 x 1.9 x 1.9 cm.
© John Veevaert

Mckelveyite-(Y) Crystallography

Axial Ratios:

a:b:c =1.7316:1:1.5052

Cell Dimensions:

a = 15.8213, b = 9.1364, c = 13.7522, Z = 4; beta = 112.44° V = 1,837.35 Den(Calc)= 3.51

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cc

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

By Intensity(I/I_o): 2.915(1), 4.46(0.9), 2.638(0.8),

Crystal Structure:

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Demartin F , Gramaccioli C M , Campostrini I , Diella V , The Canadian Mineralogist , 46 (2008) p.195-203, The crystal structure of mckelveyite-(Y)-2M, a new monoclinic polytype from, Val Malenco, Italian Alps, Locality: Cava Fabi, talc quarry near Lanzada, Val Malenco, Lombardy, Italy

Physical Properties of Mckelveyite-(Y)

Cleavage:

{???} Indistinct

Color:

Yellow, Black, Greenish gray, White, Gray.

Density:

3.47 - 3.58, Average = 3.52

Diaphaneity:

Translucent to Opaque

Habit:

Pyramidal - Crystals are shaped like pyramids.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Mckelveyite-(Y)

Gladstone-Dale:

CI meas= 0.039 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1669,KPDmeas= 0.1662,KC= 0.173
Ncalc = 1.6 - 1.62

Optical Data:

Biaxial (-), a=1.55-1.554, b=1.55-1.554, g=1.649-1.658, bire=0.0990-0.1040, 2V(Calc)=0, 2V(Meas)=0.

Calculated Properties of Mckelveyite-(Y)

Electron Density:

Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Mckelveyite-(Y) =3.51 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_{Mckelveyite-(Y)}= 196.80 barns/electron
U=PE_{Mckelveyite-(Y)} x r_electron= 633.58 barns/cc.

Radioactivity:

GRapi = 1,891.83 (Gamma Ray American Petroleum Institute Units)
Concentration of Mckelveyite-(Y) per GRapi unit = 528.59 (PPM)

**Estimated Radioactivity from Mckelveyite-(Y)** - mild
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.16 cm	43,314	1.17E-06	1,891.83	0.62
100 gm / 3.79 cm	4,331	1.17E-07	189.18	0.06
10 gm / 1.76 cm	433	1.17E-08	18.92	0.01
1 gm / 8.16 mm	43	1.17E-09	1.89	0.00
0.1 gm / 3.79 mm	4	1.17E-10	0.19	0.00
0.01 gm / 1.76 mm	0	1.17E-11	0.02	0.00
0.001 gm / 0.82 mm	0	1.17E-12	0.00	0.00

Weight of pure Mckelveyite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.51 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.10 % Th) From Sum REE Elements ( 1.93 % REE)

Mckelveyite-(Y) Classification

Dana Class:

15.03.04.02 (15)Hydrated Carbonates

(15.03)where A+m B++n (XO3)p · 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 Mckelveyite-(Y) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin v93:1945) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Mckelveyite-(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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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Mckelveyite-(Y)

NaCa(Ba,Sr)3(Y,REE)(CO3)6•3(H2O)
Dana No: 15.03.04.02 Strunz No: 05.CC.05
Locality:

Notes: