Mckelveyite-(Y) Mineral Data

Mckelveyite-(Y) Mineral Data +

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General Mckelveyite-(Y) Information

Chemical Formula:

Ba3Na(Ca,U)Y(CO3)6·3(H2O)

Composition:

Molecular Weight = 1,027.54 gm

Barium 40.09 % Ba 44.76 % BaO

Sodium 2.24 % Na 3.02 % Na₂O

Calcium 2.93 % Ca 4.09 % CaO

Yttrium 8.65 % Y 10.99 % Y₂O₃

Uranium 5.79 % U 6.57 % UO₂

Hydrogen 0.59 % H 5.26 % H₂O

Carbon 7.01 % C 25.70 % CO₂

Oxygen 32.70 % O

______ ______

100.00 % 100.39 % = TOTAL OXIDE

Empirical Formula:

Ba₃NaCa_0.75U_0.25Y(CO₃)₆·3(H₂O)

Environment:

Eocene-aged lacustrine deposits.

IMA Status:

Approved IMA 1965

Locality:

Green River Formation, Sweetwater County, Wyoming, USA. Link to MinDat.org Location Data.

Name Origin:

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

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Mckelveyite-(Y) Crystallography

Axial Ratios:

a:b:c =1.0001:1:0.7657

Cell Dimensions:

a = 9.142, b = 9.141, c = 7, Z = 1; alpha = 102.51°, beta = 115.67°, gamma = 59.99° V = 445.71 Den(Calc)= 3.83

Crystal System:

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

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

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

Physical Properties of Mckelveyite-(Y)

Cleavage:

[???] Indistinct

Color:

Yellow, Black, Greenish gray, White, Gray.

Density:

3.47 - 3.58, Average = 3.52

Diaphaniety:

Translucent to Opaque

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Mckelveyite-(Y)

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.095 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.153,KPDmeas= 0.1662,KC= 0.169

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:

r_electron=3.20 gm/cc
note: r_{Mckelveyite-(Y)}=3.53 gm/cc.

Fermion Index

Fermion Index = 0.07284
Boson Index = 0.92716

Photoelectric:

PE_{Mckelveyite-(Y)}= 333.77 barns/electron
U=PE_{Mckelveyite-(Y)} x r_electron=1,067.16 barns/cc.

Radioactivity:

GRapi = 447,732.53 (Gamma Ray American Petroleum Institute Units)

Mckelveyite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 67.93 ± 16.98 grams of pure Mckelveyite-(Y) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 6793.5 ±1698.4 grams of pure Mckelveyite-(Y) .

**Estimated Radioactivity from Mckelveyite-(Y)** - strong
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 / 8.15 cm	10,366,266	2.80E-04	447,732.53	147.20
100 gm / 3.78 cm	1,036,627	2.80E-05	44,773.25	14.72
10 gm / 1.76 cm	103,663	2.80E-06	4,477.33	1.47
1 gm / 8.15 mm	10,366	2.80E-07	447.73	0.15
0.1 gm / 3.78 mm	1,037	2.80E-08	44.77	0.01
0.01 gm / 1.76 mm	104	2.80E-09	4.48	0.00
0.001 gm / 0.82 mm	10	2.80E-10	0.45	0.00

Weight of pure Mckelveyite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.53 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

Mckelveyite-(Y) Classification

Dana Class:

15.3.4.2 (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.04-20 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 Mckelveyite-(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 Mckelveyite-(Y) :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - Uranium Minerals

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Mckelveyite-(Y)

Ba3Na(Ca,U)Y(CO3)6·3(H2O)
Dana No: 15.3.4.2 Strunz No: V/D.04-20
Locality:

Notes: