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Mckelveyite-(Y)

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Vincent Ellis McKelvey
Formula:
NaCaBa3Y(CO3)6 · 3H2O
System:
Triclinic
Colour:
Yellow, orange-brown, ...
Hardness:
3½ - 4
Name:
For Vincent Ellis McKelvey (1916-1985), director of the USGS for his studies of the Phosphoria formation.
Donnayite Group

2M polytype known (proposal IMA2005-012a, now withdrawn).

Classification of Mckelveyite-(Y)

Approved
5.CC.05

5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
C : With rare earth elements (REE)
15.3.4.2

15 : HYDRATED NORMAL CARBONATES
3 : AmBn(XO3)p·xH2O, with (m+n):p = 1:1
11.8.20

11 : Carbonates
8 : Carbonates of the rare earths
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http://www.mindat.org/min-2617.html
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Type Occurrence of Mckelveyite-(Y)

Place of Conservation of Type Material:
Smithsonian
Geological Setting of Type Material:
From core in the Green River formation

Physical Properties of Mckelveyite-(Y)

Vitreous, Greasy, Dull
Diaphaneity (Transparency):
Transparent, Translucent, Opaque
Colour:
Yellow, orange-brown, gray, greenish-brown, nearly black.
Hardness (Mohs):
3½ - 4
Density:
3.25(5) g/cm3 (Measured)    3.37 g/cm3 (Calculated)

Crystallography of Mckelveyite-(Y)

Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Mckelveyite-(Y)-2M
 
Monoclinic 
 
 

 
 
 

Optical Data of Mckelveyite-(Y)

Type:
Biaxial (-)
RI values:
nα = 1.550 - 1.554 nβ = 1.550 - 1.554 nγ = 1.649 - 1.658
Max Birefringence:
δ = 0.099 - 0.104
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
weak to distinct
Pleochroism:
Visible
Comments:
In greens

Chemical Properties of Mckelveyite-(Y)

Formula:
NaCaBa3Y(CO3)6 · 3H2O
Essential elements:
All elements listed in formula:

Relationship of Mckelveyite-(Y) to other Species

5.CC.05Donnayite-(Y)NaCaSr3Y(CO3)6 · 3H2O
5.CC.05EwalditeBa(Na,Ca,Y,Ce,K)(CO3)2 · 2.6H2O
5.CC.05Mckelveyite-(Nd)(Ba,Sr)(Nd,Ce,La)(CO3)2 · 4-10H2O
5.CC.05WeloganiteNa2Sr3Zr(CO3)6 · 3H2O
5.CC.10Tengerite-(Y)Y2(CO3)3 · 2-3H2O
5.CC.15Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2O
5.CC.15Lokkaite-(Y)Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2O
5.CC.20Shomiokite-(Y)Na3Y[CO3]3 · 3H2O
5.CC.25Calkinsite-(Ce)(Ce,La)2(CO3)3 · 4H2O
5.CC.25Lanthanite-(Ce)(Ce,La,Nd)2(CO3)3 · 8H2O
5.CC.25Lanthanite-(La)(La,Ce)2(CO3)3 · 8H2O
5.CC.25Lanthanite-(Nd)(Nd,La)2(CO3)3 · 8H2O
5.CC.30Adamsite-(Y)NaY[CO3]2 · 6H2O
5.CC.35Decrespignyite-(Y)Cu(Y,REE)4(CO3)4(OH)5Cl · 2H2O
5.CC.40Galgenbergite-(Ce)Ca(Ce,La,Nd)2(CO3)4 · H2O
11.8.1Calkinsite-(Ce)(Ce,La)2(CO3)3 · 4H2O
11.8.2Lanthanite-(La)(La,Ce)2(CO3)3 · 8H2O
11.8.3Lanthanite-(Ce)(Ce,La,Nd)2(CO3)3 · 8H2O
11.8.4Lanthanite-(Nd)(Nd,La)2(CO3)3 · 8H2O
11.8.5Hydroxylbastnäsite-(Ce)(Ce,La)(CO3)(OH,F)
11.8.6Hydroxylbastnäsite-(Nd)(Nd,Ce,La)(CO3)(OH,F)
11.8.7Hydroxylbastnäsite-(La)(La,Nd,Ce)(CO3)(OH,F)
11.8.8Rémondite-(Ce)Na3(Ce,La,Ca,Na,Sr)3(CO3)5
11.8.9Tengerite-(Y)Y2(CO3)3 · 2-3H2O
11.8.10Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2O
11.8.11Lokkaite-(Y)Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2O
11.8.12Calcioancylite-(Nd)Ca(Nd,La,Ce)(CO3)2(OH).H2O
11.8.13Calcioancylite-(Ce)(Ca,Sr)Ce(CO3)2(OH) · H2O
11.8.14Burbankite(Na,Ca)3(Sr,Ba,Ce)3(CO3)5
11.8.15Khanneshite(Na,Ca)3(Ba,Sr,Ce,Ca)3(CO3)5
11.8.16Donnayite-(Y)NaCaSr3Y(CO3)6 · 3H2O
11.8.17Carbocernaite(Ca,Na)(Sr,Ce,Ba)(CO3)2
11.8.18Ancylite-(Ce)SrCe(CO3)2(OH) · H2O
11.8.19EwalditeBa(Na,Ca,Y,Ce,K)(CO3)2 · 2.6H2O
11.8.21Sahamalite-(Ce)(Mg,Fe)(Ce,La,Nd)2(CO3)4

Other Names for Mckelveyite-(Y)

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Mckelveyite-(Y)

Reference List:
American Mineralogist (1965): 50: 593-612.

American Mineralogist (1979): 64: 659.

American Mineralogist (1993): 78: 236-237.

Internet Links for Mckelveyite-(Y)

Localities for Mckelveyite-(Y)

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Bolivia
 
  • Cochabamba Department
    • Ayopaya Province
Anthony R. Kampf
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
Italy
 
  • Lombardy
    • Sondrio Province
      • Valtellina
Demartin F., Gramaccioli C.M., Campostrini I., Diella V. (2008): Canad.Mineral., 46, 195-203.
          • Lanterna Valley
            • Lanzada
              • Mt. Motta
Demartin, F., Gramaccioli, C.M., Campostrini, I., Diella, V. (2008): The crystal structure of mckelveyite-(Y)-2M, a new monoclinic polytype from Val Malenco, Italian Alps. Canadian Mineralogist, 46, 195-203.
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
PEKOV, I.V. & NIKOLAEV, A.P. (2013) Minerals of the pegmatites and hydrothermal assemblages of the Koashva deposit (Khibiny, Kola Peninsula, Russia). Mineralogical Almanac 189(2), 7-65.
          • Kukisvumchorr Mt
[World of Stones 95:5-6, p64]
Pekov, I. et al (2003): New Data on Minerals: 38: 20-33.
www.koeln.netsurf.de/~w.steffens/lovo.htm
Sorokhtina, N.V., Chukanov, N.V., Voloshin, A.V., Pakhomovsky, Y.A., Bogdanova, A.N., and Moiseev, M.M. (2008): Geology of Ore Deposits 50(7), 620-628.
      • Northern Karelia
www.koeln.netsurf.de/~w.steffens/vuori.htm; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
USA (TL)
 
  • Wyoming
    • Sweetwater Co.
      • Green River Formation
Am Min 50:593-612
Mineral and/or Locality  
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