Mckelveyite-(Nd) Mineral Data

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 % 100.18 % = 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.

Name Pronunciation:

Mckelveyite-(Nd) + Pronunciation

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 - Pinacoidal H-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

Diaphaneity:

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= 0.133 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1895,KPDmeas= 0.1758,KC= 0.2187
Ncalc = 1.72 - 1.78

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:

Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Mckelveyite-(Nd) =3.27 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_{Mckelveyite-(Nd)}= 151.52 barns/electron
U=PE_{Mckelveyite-(Nd)} x r_electron= 481.01 barns/cc.

Radioactivity:

GRapi = 9,813.26 (Gamma Ray American Petroleum Institute Units)
Concentration of Mckelveyite-(Nd) per GRapi unit = 101.90 (PPM)

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 / 8.36 cm	212,269	5.74E-06	9,813.26	3.23
100 gm / 3.88 cm	21,227	5.74E-07	981.33	0.32
10 gm / 1.80 cm	2,123	5.74E-08	98.13	0.03
1 gm / 8.36 mm	212	5.74E-09	9.81	0.00
0.1 gm / 3.88 mm	21	5.74E-10	0.98	0.00
0.01 gm / 1.80 mm	2	5.74E-11	0.10	0.00
0.001 gm / 0.84 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 3.27 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:

15.03.04.03 (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 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 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Print or Cut-and-Paste your Mckelveyite-(Nd) Specimen Label here :

Mckelveyite-(Nd)

(Ba,Sr)(Ca,Na,Nd,REE)(CO3)2•3-10(H2O)
Dana No: 15.03.04.03 Strunz No: 05.CC.05
Locality:

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