Mineralogy Database

Mckelveyite-(Y) Mineral Data

Search Webmineral :
  
Advertisment

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   Image in a New Browser Window Images:
Click Here for Larger   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 - Domatic H-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),
 

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
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

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

Search for Mckelveyite-(Y) using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Mckelveyite-(Y) :

Ask about Mckelveyite-(Y) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaol

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:

 

 
   
 


Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.