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Semenovite-(Ce)

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Big Photo

Tasseq Slopes (Taseq Slopes), Tasseq area, Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland
© 2007, JGW

Show Semenovite-(Ce) Photos (9)



Formula:
Na
 
8
Ca
 
2
FeBe
 
6
Ce
 
2
Si
 
14
O
 
40
(OH)
 
4
F
 
4
System:OrthorhombicColour:reddish brown, ...
Hardness:3½ - 4
Name:
Named in honour of Professor Evgeny Ivanovich Semenov (1927-), Russian mineralogist, Institute of Mineralogy and Geochemistry of Rare Elements (IMGRE), Moscow
This page provides mineralogical data about Semenovite-(Ce).

Classification of Semenovite-(Ce)

IMA status:Approved 1971
Strunz 8th edition ID:8/G.03-10
Nickel-Strunz 10th (pending) edition ID:9.DN.10

9 : SILICATES (Germanates)
D : Inosilicates
N : Inosilicates with 6-periodic double chains
Dana 8th edition ID:72.5.2.4

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
Hey's CIM Ref.:14.3.10

14 : Silicates not Containing Aluminum
3 : Silicates of Be
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Type Occurrence of Semenovite-(Ce)

Type Locality:Tasseq Slopes (Taseq Slopes), Tasseq area, Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland

Physical Properties of Semenovite-(Ce)

Lustre:Vitreous, Waxy
Diaphaneity (Transparency):Transparent, Translucent
Colour:reddish brown, colourless, gray, brown
Streak:White
Hardness (Mohs):3½ - 4
Cleavage:None Observed

Crystallography of Semenovite-(Ce)

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:a = 13.879(5) Å, b = 13.835(5) Å, c = 9.942(6) Å
Ratio:a:b:c = 1.003 : 1 : 0.719
Unit Cell Volume:V 1,909.02 ų (Calculated from Unit Cell)
Comment:Space group Pmnn (non-standard setting). Pseudotetragonal.

Optical Data of Semenovite-(Ce)

Type:Biaxial (-)
RI values: nα = 1.595 nβ = 1.614 nγ = 1.614
Maximum Birefringence:δ = 0.019

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v or r < v

Chemical Properties of Semenovite-(Ce)

Formula:
Na
 
8
Ca
 
2
FeBe
 
6
Ce
 
2
Si
 
14
O
 
40
(OH)
 
4
F
 
4
Essential elements:Be, Ca, Ce, F, Fe, H, Na, O, Si
All elements listed in formula:Be, Ca, Ce, F, Fe, H, Na, O, Si

Relationship of Semenovite-(Ce) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DN.05Emeleusite
Li
 
2
Na
 
4
Fe
 
2
Si
 
12
O
 
30
9.DN.05Tuhualite
(Na,K)
 
2
Fe
 
2
Fe
 
2
Si
 
12
O
 
30
 · H
 
2
O
9.DN.05Zektzerite
LiNa(Zr,Ti,Hf)Si
 
6
O
 
15
9.DN.15Ashcroftine-(Y)
K
 
5
Na
 
5
(Y,Ca)
 
12
Si
 
28
O
 
70
(OH)
 
2
(CO
 
3
)
 
8
 · 8H
 
2
O
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
)
14.3.11Barylite
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
14.3.25Calciogadolinite-(Y)
(YCa)
 
2
Fe
3+
 
Be
 
2
[SiO
 
4
]
 
2
O
 
2

Other Names for Semenovite-(Ce)

Synonyms:
IMA1971-036Semenovite
Other Languages:
German:Semenovit
Semenovit-(Ce)
Russian:Семеновит-(Ce)
Spanish:Semenovita

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 Semenovite-(Ce)

Reference List:

- +
Petersen, O.V., Rønsbo, J.G. (1972): Lithos, 5, 163-173.

American Mineralogist 58 (1973), 1114.

Mazzi, F., Ungaretti, L., Dal Negro, A., Peterson, O.V., Rønsbo, J.G. (1979): American Mineralogist, 64, 202-210.

Internet Links for Semenovite-(Ce)

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    • Localities for Semenovite-(Ce)

    The 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.
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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.
    Greenland
     
    • Kitaa (West Greenland) Province
      • Narsaq
        • Ilimaussaq complex
          • Tasseq area
    		Petersen O V, Rönsbo J G (1972) Semenovite - a new mineral from the Ilimaussaq alkaline intrusion, south Greenland, Lithos 5, 163-173
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