Mckelveyite-(Nd) Mineral Data

Mckelveyite-(Nd) Mineral Data +

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General Mckelveyite-(Nd) Information

Chemical Formula:

(Ba,Sr)(Ca,Na,Nd,REE)(CO3)2·3-10(H2O)

Composition:

Molecular Weight = 456.93 gm

Barium 22.54 % Ba 25.17 % BaO

Sodium 1.01 % Na 1.36 % Na₂O

Strontium 4.79 % Sr 5.67 % SrO

Calcium 4.39 % Ca 6.14 % CaO

La,Ce,Pr,Nd,Sm, 3.15 % RE 3.68 % REE₂O₃

Hydrogen 3.53 % H 31.54 % H₂O

Carbon 5.26 % C 19.26 % CO₂

Neodymium 6.31 % Nd 7.36 % Nd₂O₃

Oxygen 49.02 % O

______ ______

100.00 % 100.17 % = TOTAL OXIDE

Empirical Formula:

Ba_0.75Sr_0.25Ca_0.5Na_0.2Nd_0.2REE_0.1(CO₃)₂·8(H₂O)

Environment:

An inadequately described species.

IMA Status:

Not Approved IMA 1993

Locality:

Vuoriyarvi massif, Kola Peninsula, Russia. 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-(Nd) Crystallography

Axial Ratios:

a:b:c =1.0001:1:0.7669

Cell Dimensions:

a = 9.183, b = 9.182, c = 7.042, Z = 2; alpha = 102.52°, beta = 115.66°, gamma = 59.99° V = 452.44 Den(Calc)= 3.35

Crystal System:

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

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

By Intensity(I/I_o): 2.933(1), 4.49(0.9), 2.655(0.8),

Physical Properties of Mckelveyite-(Nd)

Cleavage:

None

Color:

Brown, Yellow, Light green.

Density:

3.47 - 3.58, Average = 3.52

Diaphaniety:

Translucent

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Mckelveyite-(Nd)

Gladstone-Dale:

CI meas= 0.196 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.154 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.185,KPDmeas= 0.1758,KC= 0.2187

Optical Data:

Biaxial (-), a=1.556, b=1.65, g=1.653, bire=0.0970, 2V(Calc)=18, 2V(Meas)=10-13.

Calculated Properties of Mckelveyite-(Nd)

Electron Density:

r_electron=3.25 gm/cc
note: r_{Mckelveyite-(Nd)}=3.35 gm/cc.

Fermion Index

Fermion Index = 0.06319
Boson Index = 0.93681

Photoelectric:

PE_{Mckelveyite-(Nd)}= 151.52 barns/electron
U=PE_{Mckelveyite-(Nd)} x r_electron= 492.78 barns/cc.

Radioactivity:

GRapi = 9,813.25 (Gamma Ray American Petroleum Institute Units)

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

**Estimated Radioactivity from Mckelveyite-(Nd)** - 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 / 8.29 cm	212,269	5.74E-06	9,813.25	3.23
100 gm / 3.85 cm	21,227	5.74E-07	981.33	0.32
10 gm / 1.79 cm	2,123	5.74E-08	98.13	0.03
1 gm / 8.29 mm	212	5.74E-09	9.81	0.00
0.1 gm / 3.85 mm	21	5.74E-10	0.98	0.00
0.01 gm / 1.79 mm	2	5.74E-11	0.10	0.00
0.001 gm / 0.83 mm	0	5.74E-12	0.01	0.00

Weight of pure Mckelveyite-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.35 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 ( 0.47 % Th) From Sum REE Elements ( 9.46 % REE)

Mckelveyite-(Nd) Classification

Dana Class:

15.3.4.3 (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.04-25 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-(Nd) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.78,p236,1993)

See Also:

Links to other databases for Mckelveyite-(Nd) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Mckelveyite-(Nd)

(Ba,Sr)(Ca,Na,Nd,REE)(CO3)2·3-10(H2O)
Dana No: 15.3.4.3 Strunz No: V/D.04-25
Locality:

Notes: