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Calciogadolinite-(Y)

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Formula:
(YCa)
 
2
Fe
3+
 
Be
 
2
[SiO
 
4
]
 
2
O
 
2
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)

IMA status:Discredited 2006
Dana 8th edition ID:54.2.1b.4

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in [4] coordination
Hey's CIM Ref.:14.3.25

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

Formula:
(YCa)
 
2
Fe
3+
 
Be
 
2
[SiO
 
4
]
 
2
O
 
2
Simplified for copy/paste:(YCa)2Fe3+Be2[SiO4]2O2
Essential elements:Be, Ca, Fe, O, Si, Y
All elements listed in formula:Be, Ca, Fe, O, Si, Y
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

Related Minerals - Hey's Index Grouping:

- +
14.3.1Phenakite
Be
 
2
SiO
 
4
14.3.2Bertrandite
Be
 
4
(Si
 
2
O
 
7
)(OH)
 
2
14.3.3Beryllite
Be
 
3
(SiO
 
4
)(OH)
 
2
· H
 
2
O
14.3.4Liberite
Li
 
2
BeSiO
 
4
14.3.5Chkalovite
Na
 
2
BeSi
 
2
O
 
6
14.3.6Eudidymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
· H
 
2
O
14.3.7Epididymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
· H
 
2
O
14.3.8Gugiaite
Ca
 
2
Be(Si
 
2
O
 
7
)
14.3.9Jeffreyite
(Ca,Na)
 
2
(Be,Al)(Si
 
2
O
 
7
,HSi
 
2
O
 
7
)
14.3.10Semenovite-(Ce)
Na
 
8
Ca
 
2
FeBe
 
6
Ce
 
2
Si
 
14
O
 
40
(OH)
 
4
F
 
4
14.3.11Barylite
Be
 
2
Ba(Si
 
2
O
 
7
)
14.3.12Hingganite-(Ce)
(Ce,REE)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.13Hingganite-(Yb)
(Yb,Y,REE)
 
2
□Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.14Hingganite-(Y)
(Y,REE,Ca)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.15Minasgeraisite-(Y)
CaBe
 
2
Y
 
2
Si
 
2
O
 
10
14.3.16Sørensenite
Na
 
4
SnBe
 
2
Si
 
6
O
 
16
(OH)
 
4
14.3.17Trimerite
CaMn
2+
2
Be
 
3
(SiO
 
4
)
 
3
14.3.18Chiavennite
CaMnBe
 
2
Si
 
5
O
 
13
(OH)
 
2
· 2H
 
2
O
14.3.19Tvedalite
(Ca,Mn)
 
4
Be
 
3
Si
 
6
O
 
17
(OH)
 
4
· 3H
 
2
O
14.3.20Harstigite
Ca
 
6
(Mn,Mg)Be
 
4
Si
 
6
(O,OH)
 
24
14.3.21Sverigeite
NaMnMgSnBe
 
2
(SiO
 
4
)
 
3
(OH)
14.3.22Joesmithite
{Pb}{Ca
 
2
}{Mg
 
3
Fe
3+
2
}(Be
 
2
Si
 
6
O
 
22
)(OH)
 
2
14.3.23Gadolinite-(Y)
Y
 
2
Fe
2+
 
Be
 
2
Si
 
2
O
 
10
14.3.24Gadolinite-(Ce)
(Ce,La,Nd,Y)
 
2
Fe
2+
 
Be
 
2
Si
 
2
O
 
10

Other Names for Calciogadolinite-(Y)

Other Languages:
German:Calciogadolinit
Spanish:Calciogadolinita

Other Information

Health Warning:Contain Be and radioactive.

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)

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  • Localities for Calciogadolinite-(Y)

    (TL) indicates type locality. ? 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.
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