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Calciogadolinite-(Y)

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Formula:
(YCa)2Fe3+Be2[SiO4]2O2
Name:
Named by T. Nakai in 1938 according to composition and similarity with gadolinite, but considered questionable. Discredited in 2006 (considered Ca-bearing gadolinite under current site-dominance rules).
A variety of Gadolinite-(Y)

A Ca-dominant gadolinite. Although Ca dominates over any individual REE, the current site dominance rules do not allow for species status because trivalent elements (mostly REE) dominate over total divalent elements (mostly Ca) on the site.

Classification of Calciogadolinite-(Y)

Discredited 2006
54.2.1b.4

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in [4] coordination
14.3.25

14 : Silicates not Containing Aluminum
3 : Silicates of Be
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Chemical Properties of Calciogadolinite-(Y)

Formula:
(YCa)2Fe3+Be2[SiO4]2O2
Essential elements:
All elements listed in formula:
Analytical Data:
SiO2 (23.89)
ThO2 (0.80)
UO2 (0.10)
Al2O3 (1.68)
Fe2O3 (7.65)
LREE2O3 (4.69)
(Y+HREE)2O3 (24.47)
BeO (10.73)
MgO (0.14)
CaO (11.91)
MnO (0.84)
FeO (11.24)
H2O (2.19)
Sum (100.33)
wet chemical data of Nakai

Relationship of Calciogadolinite-(Y) to other Species

14.3.1PhenakiteBe2SiO4
14.3.2BertranditeBe4(Si2O7)(OH)2
14.3.3BerylliteBe3(SiO4)(OH)2 · H2O
14.3.4LiberiteLi2BeSiO4
14.3.5ChkaloviteNa2BeSi2O6
14.3.6EudidymiteNa2Be2Si6O15 · H2O
14.3.7EpididymiteNa2Be2Si6O15 · H2O
14.3.8GugiaiteCa2Be(Si2O7)
14.3.9Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)
14.3.10Semenovite-(Ce)Na8Ca2FeBe6Ce2Si14O40(OH)4F4
14.3.11BaryliteBe2Ba(Si2O7)
14.3.12Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2
14.3.13Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
14.3.14Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2
14.3.15Minasgeraisite-(Y)CaBe2Y2Si2O10
14.3.16SørenseniteNa4SnBe2Si6O16(OH)4
14.3.17TrimeriteCaMn22+Be3(SiO4)3
14.3.18ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
14.3.19Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2O
14.3.20HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24
14.3.21SverigeiteNaMnMgSnBe2(SiO4)3(OH)
14.3.22Joesmithite{Pb}{Ca2}{Mg3Fe23+}(Be2Si6O22)(OH)2
14.3.23Gadolinite-(Y)Y2Fe2+Be2Si2O10
14.3.24Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10

Other Names for Calciogadolinite-(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 Calciogadolinite-(Y)

Reference List:
Nakai (1938): Bulletin of the Chemical Society of Japan, 13, 591-594.

Can. Mineral. 44 (2006) 1557. [discreditation]

Internet Links for Calciogadolinite-(Y)

Localities for Calciogadolinite-(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.
Italy
 
  • Latium
    • Viterbo Province
      • Vico Lake
Van King
Japan
 
  • Honshu Island
    • Chubu region
      • Nagano prefecture
Nagashima & Nagashima (1960) Nihon Kigenso Koubutsu, 184-189.
Mongolia
 
  • Hovd Aimag (Khovd Aimag)
    • Altai Mts
      • Khaldzan Buragtag Massif
        • Mount Ulyn Khuren
Kartashov P.M., Voloshin A.V., PakhomovskiiYa.A. On the zonal crystaline gadolinite from the alkaline granite pegmatites of Haldzan Buragtag (Mongolian Altai), - Zapiski VMO, 1993,N3,p. 65-79.
Mineral and/or Locality  
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