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Keiviite-(Y)

Big Photo

Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© Pavel M. Kartashov

Show Keiviite-(Y) Photos (5)
Formula:
(Y,Yb)
 
2
[Si
 
2
O
 
7
]
Hardness:4 - 5


Keiviite-(Y)-Keiviite-(Yb) Series.

Classification of Keiviite-(Y)

IMA status:Approved
Strunz 8th edition ID:8/C.01-20
Nickel-Strunz 10th (pending) edition ID:9.BC.05

9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
Dana 8th edition ID:55.2.1a.2

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
2 : Si2O7 Groups, Generally with no Additional Anions with cations in [6] coordination
Hey's CIM Ref.:14.8.2

14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al
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Type Occurrence of Keiviite-(Y)

Type Locality:Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia

Physical Properties of Keiviite-(Y)

Hardness (Mohs):4 - 5

Optical Data of Keiviite-(Y)

Type:Biaxial (-)
RI values: nα = 1.713 nβ = 1.748 nγ = 1.758
2V:Measured: 55° to 56°, Calculated: 54°
Maximum Birefringence:δ = 0.045

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:weak

Chemical Properties of Keiviite-(Y)

Formula:
(Y,Yb)
 
2
[Si
 
2
O
 
7
]
Essential elements:O, Si, Y
All elements listed in formula:O, Si, Y, Yb

Relationship of Keiviite-(Y) to other Species

Series:Forms a series with Keiviite-(Yb) (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
9.BC.05Gittinsite
CaZr[Si
 
2
O
 
7
]
9.BC.05Keiviite-(Yb)
(Yb,Y)
 
2
[Si
 
2
O
 
7
]
9.BC.05Thortveitite
(Sc,Y)
 
2
[Si
 
2
O
 
7
]
9.BC.05Yttrialite-(Y)
(Y,Th)
 
2
[Si
 
2
O
 
7
]
9.BC.10Keldyshite
(Na,H)
 
2
ZrSi
 
2
O
 
7
9.BC.10Khibinskite
K
 
2
ZrSi
 
2
O
 
7
9.BC.10Parakeldyshite
Na
 
2
ZrSi
 
2
O
 
7
9.BC.15Rankinite
Ca
 
3
Si
 
2
O
 
7
9.BC.20Barysilite
Pb
 
8
Mn
2+
 
[Si
 
2
O
 
7
]
 
3
9.BC.25Edgarbaileyite
(Hg-Hg)
 
3
[Si
 
2
O
 
7
]
9.BC.30Kristiansenite
Ca
 
2
ScSn(Si
 
2
O
 
7
)(Si
 
2
O
 
6
OH)
9.BC.35Percleveite-(Ce)
(Ce,La,Nd)
 
2
[Si
 
2
O
 
7
]
Related Minerals - Hey's Index Grouping:

- +
14.8.1Thalénite-(Y)
Y
 
3
Si
 
3
O
 
10
(OH)
14.8.3Keiviite-(Yb)
(Yb,Y)
 
2
[Si
 
2
O
 
7
]
14.8.4Tombarthite-(Y)
Y
 
4
[HSiO
 
4
]
 
3
14.8.5Thortveitite
(Sc,Y)
 
2
[Si
 
2
O
 
7
]
14.8.6Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
14.8.7Monteregianite-(Y)
(Na,K)
 
6
(Y,Ca)
 
2
Si
 
16
O
 
38
·10H
 
2
O
14.8.8Iraqite-(La)
K(Ca,Na)
 
2
(La,Ce,Th)[(Si,Al)
 
8
O
 
20
]
14.8.9Ashcroftine-(Y)
K
 
5
Na
 
5
(Y,Ca)
 
12
Si
 
28
O
 
70
(OH)
 
2
(CO
 
3
)
 
8
·8H
 
2
O
14.8.10Nordite-(La)
(La,Ce)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.11Nordite-(Ce)
(Ce,La)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.12Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
14.8.13Cerite-(Ce)
(Ce,Ca)
 
9
(Mg,Fe)Si
 
7
(O,OH,F)
 
28
14.8.14Cascandite
Ca(Sc,Fe
3+
 
)[HSi
 
3
O
 
9
]

Other Names for Keiviite-(Y)

Synonyms:
IMA1984-054
Other Languages:
Russian:Кейвиит-(Y)

Other Information

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

References for Keiviite-(Y)

Reference List:American Mineralogist (1988): 73: 191-192.

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    Localities for Keiviite-(Y)

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    (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.
    Norway
     
    • Nordland
      • Tysfjord
    		Collection of Tomas Husdal
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Western Keivy Massif
    		A.V. Voloshin, Ya.A. Pakhomovskii Minerals and mineralformation evolution in amazonite pegmatites of Kola peninsula, - Leningrad, Nauka, 1986, pp.168.
    Sweden
     
    • Uppland
      • Vaxholm
        • Resarö
    		No reference listed
    • Värmland
      • Filipstad
    		Kristiansen, Roy (1993): Thalenitt-liknende mineraler fra Åskagen, Sverige. STEIN 20 (19), 7-8 + 58-60
    Mineral and/or Locality
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