Mckelveyite-(Y) Mineral Data (original) (raw)

General Mckelveyite-(Y) Information

Help on Chemical Formula: Chemical Formula:

NaCa(Ba,Sr)3(Y,REE)(CO3)6•3(H2O)

Help on Composition: 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

Help on Empirical Formula: Empirical Formula:

NaCa0.83Na0.07Sr0.11Ba2.79Sr0.2Y0.74REE0.13Ca0.12(CO3)6�3(H2O)

Help on Environment: Environment:

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

Help on IMA Status: IMA Status:

Approved IMA 1965

Help on Locality: 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.

Help on Name Origin: Name Origin:

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

Help on Name Pronunciation: Name Pronunciation:

Mckelveyite-(Y) + Pronunciation Say MCKELVEYITE-(Y)

Mckelveyite-(Y) Image

Click Here for Larger Mckelveyite-(Y) Image in a New Browser Window Images:

Click Here for Larger Mckelveyite-(Y) Image 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

Help on Axial Ratios: Axial Ratios:

a:b:c =1.7316:1:1.5052

Help on Cell Dimensions: Cell Dimensions:

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

Help on Crystal System: Crystal System:

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

Help on X Ray Diffraction: X Ray Diffraction:

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

Click Here for Large Mckelveyite-(Y) Structure Window Crystal Structure:

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Help on Above

| | 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)

Help on Cleavage: Cleavage:

{???} Indistinct

Help on Color: Color:

Yellow, Black, Greenish gray, White, Gray.

Help on Density: Density:

3.47 - 3.58, Average = 3.52

Help on Diaphaneity: Diaphaneity:

Translucent to Opaque

Help on Habit: Habit:

Pyramidal - Crystals are shaped like pyramids.

Help on Hardness: Hardness:

3.5-4 - Copper Penny-Fluorite

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

white

Optical Properties of Mckelveyite-(Y)

Help on Gladstone-Dale: 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

Help on Optical Data: 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)

Help on Electron Density: Electron Density:

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

Help on Fermion Index: Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Help on Photoelectric: Photoelectric:

PEMckelveyite-(Y) = 196.80 barns/electron
U=PEMckelveyite-(Y) x relectron= 633.58 barns/cc.

Help on Radioactivity: 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

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor 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

Help on Dana Class: 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

Help on Strunz Class: 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

Help on References: References:

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

Help on See Also: 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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Print or Cut-and-Paste your Mckelveyite-(Y) Specimen Label here :

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: