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Semenovite-(Ce)

A valid IMA mineral species

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Photos of Semenovite-(Ce) (19)

Semenovite-(Ce) Gallery Search Photos of Semenovite-(Ce)

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Semenovite-(Ce)

Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland

Semenovite-(Ce), etc.

Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland

Semenovite-(Ce)

Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland

Semenovite-(Ce)

Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland

Semenovite-(Ce), etc.

Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland

Semenovite-(Ce)

Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland

Semenovite-(Ce)

Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland

Semenovite-(Ce), etc.

Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland

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About Semenovite-(Ce)Hide

Evgeny Ivanovich Semenov

Formula:

Na₈Ca₂FeBe₆Ce₂Si₁₄O₄₀(OH)₄F₄

Colour:

Reddish brown, colourless, gray, brown

Lustre:

Vitreous, Waxy

Hardness:

3½ - 4

Specific Gravity:

3.140

Crystal System:

Orthorhombic

Name:

Named in 1972 by Ole Valdemar Petersen and Jørn Grummesgaard Ronsbo in honor of Professor Evgeny Ivanovich Semenov [1927 - March 2017], Russian mineralogist, Institute of Mineralogy and Geochemistry of Rare Elements (IMGRE), Moscow. He described nearly 30 new minerals.

Type Locality:

ⓘ Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland

Chemically somewhat similar to letnikovite-(Ce).

Unique IdentifiersHide

Mindat ID:

3615

Long-form identifier:

mindat:1:1:3615:9

GUID
(UUID V4):

3b007f10-ab86-45e9-9299-26f0ab3ae023

IMA Classification of Semenovite-(Ce)Hide

IMA status:

Approved

IMA Formula:

(Na,Ca)₉Fe²⁺Ce₂(Si,Be)₂₀(O,OH,F)₄₈

Approval year:

1971

First published:

1972

Classification of Semenovite-(Ce)Hide

Strunz-mindat (2024):

9.DN.10

9 : SILICATES (Germanates)
D : Inosilicates
N : Inosilicates with 6-periodic double chains

Dana 8th ed.:

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Smv-Ce	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of Semenovite-(Ce)Hide

Lustre:

Vitreous, Waxy

Transparency:

Transparent, Translucent

Colour:

Reddish brown, colourless, gray, brown

Streak:

White

Hardness:

3½ - 4 on Mohs scale

Cleavage:

None Observed

Fracture:

Irregular/Uneven

Density:

3.140(2) g/cm³ (Measured) 3.17 g/cm³ (Calculated)

Optical Data of Semenovite-(Ce)Hide

Type:

Biaxial (-)

RI values:

n_α = 1.595 n_β = 1.614 n_γ = 1.614

Max Birefringence:

δ = 0.019

Image 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

Chemistry of Semenovite-(Ce)Hide

Mindat Formula:

Na₈Ca₂FeBe₆Ce₂Si₁₄O₄₀(OH)₄F₄

Elements listed:

Be, Ca, Ce, F, Fe, H, Na, O, Si - search for minerals with similar chemistry

Crystallography of Semenovite-(Ce)Hide

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 V:

1,909.02 Å³ (Calculated from Unit Cell)

Morphology:

Pseudotetragonal dipyramidal crystals.

Twinning:

Always intricately twinned. The twin plane is (110), but the single individuals are bounded by the prism {120}.

Comment:

Space group Pmnn (non-standard setting). Pseudotetragonal.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0000705	Semenovite-(Ce)	Mazzi F, Ungaretti L, Dal Negro A, Petersen O V, Ronsbo J G (1979) The crystal structure of semenovite American Mineralogist 64 202-210		1979		0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Semenovite-(Ce)'
loop_
_publ_author_name
'Mazzi F'
'Ungaretti L'
'Dal Negro A'
'Petersen O V'
'Ronsbo J G'
_journal_name_full 'American Mineralogist'
_journal_volume 64 
_journal_year 1979
_journal_page_first 202
_journal_page_last 210
_publ_section_title
;
 The crystal structure of semenovite
;
_database_code_amcsd 0000705
_chemical_formula_sum 'Ce Na3.4 Fe.25 Mn.25 Ca1.3 Si7 Be3 O22 F2 H2'
_cell_length_a 13.879
_cell_length_b 13.835
_cell_length_c 9.942
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1909.023
_exptl_crystal_density_diffrn      3.179
_symmetry_space_group_name_H-M 'P m n n'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2-z'
  '1/2-x,1/2-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '-x,y,z'
  'x,-y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Ce1   0.13900   0.00000   0.00000   0.80000
Na1   0.13900   0.00000   0.00000   0.14000
Na2   0.13490   0.00000   0.50000   0.56000
Ce2   0.13490   0.00000   0.50000   0.20000
Fe3   0.50000   0.00000   0.50000   0.40000
Mn3   0.50000   0.00000   0.50000   0.40000
Fe4   0.50000   0.00000   0.00000   0.10000
Mn4   0.50000   0.00000   0.00000   0.10000
Ca5   0.13850   0.20970   0.01280   0.52000
Na5   0.13850   0.20970   0.01280   0.48000
Na6   0.14310   0.30600   0.50530   0.87000
Ca6   0.14310   0.30600   0.50530   0.13000
Si1   0.33730  -0.00440   0.25320   1.00000
Si2   0.20450   0.15090   0.27890   0.80000
Be2   0.20450   0.15090   0.27890   0.20000
Be3   0.20430   0.15470   0.77690   0.80000
Si3   0.20430   0.15470   0.77690   0.20000
Si4   0.50000   0.12970   0.23640   0.80000
Be4   0.50000   0.12970   0.23640   0.20000
Be5   0.50000   0.13880   0.72890   0.80000
Si5   0.50000   0.13880   0.72890   0.20000
Si6   0.00000   0.14930   0.23500   1.00000
Si7   0.00000   0.15130   0.74660   1.00000
O1   0.24900   0.24730   0.33930   1.00000
O2   0.26680   0.06270   0.34730   1.00000
O3   0.27030   0.06490   0.84770   1.00000
O4   0.40610   0.07370   0.17130   1.00000
O5   0.40650   0.07420   0.65670   1.00000
O6   0.09400   0.13790   0.33750   1.00000
O7   0.09630   0.13950   0.83930   1.00000
O8   0.20230   0.14490   0.11720   1.00000
F9   0.20660   0.15470   0.62080   1.00000
O10   0.50000   0.23970   0.16990   1.00000
O11   0.50000   0.24500   0.66480   1.00000
O12   0.50000   0.13280   0.39340   1.00000
O-H13   0.50000   0.13610   0.88570   1.00000
O14   0.00000   0.06190   0.12340   1.00000
O-H15   0.00000   0.07560   0.62090   1.00000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Ce1 0.01171 0.01455 0.01402 0.00000 0.00000 -0.00209
Na1 0.01171 0.01455 0.01402 0.00000 0.00000 -0.00209
Na2 0.05172 0.06497 0.04356 0.00000 0.00000 0.00906
Ce2 0.05172 0.06497 0.04356 0.00000 0.00000 0.00906
Fe3 0.02342 0.01745 0.01903 0.00000 0.00000 0.00070
Mn3 0.02342 0.01745 0.01903 0.00000 0.00000 0.00070
Fe4 0.03806 0.01261 0.01302 0.00000 0.00000 0.00836
Mn4 0.03806 0.01261 0.01302 0.00000 0.00000 0.00836
Ca5 0.01464 0.02133 0.01152 0.00778 0.00140 0.00070
Na5 0.01464 0.02133 0.01152 0.00778 0.00140 0.00070
Na6 0.01659 0.03685 0.02003 0.00973 0.00280 -0.00906
Ca6 0.01659 0.03685 0.02003 0.00973 0.00280 -0.00906
Si1 0.01269 0.01745 0.02003 0.00389 -0.00210 0.00000
Si2 0.00683 0.01067 0.01052 0.00000 -0.00140 -0.00070
Be2 0.00683 0.01067 0.01052 0.00000 -0.00140 -0.00070
Be3 0.01464 0.03200 0.02203 0.00097 0.00419 0.00418
Si3 0.01464 0.03200 0.02203 0.00097 0.00419 0.00418
Si4 0.01366 0.00970 0.01001 0.00000 0.00000 -0.00627
Be4 0.01366 0.00970 0.01001 0.00000 0.00000 -0.00627
Be5 0.01464 0.02909 0.03205 0.00000 0.00000 0.02857
Si5 0.01464 0.02909 0.03205 0.00000 0.00000 0.02857
Si6 0.00976 0.01939 0.02103 0.00000 0.00000 0.00279
Si7 0.01952 0.02327 0.02404 0.00000 0.00000 0.00279
O1 0.02635 0.01551 0.01502 -0.00292 -0.00629 -0.00557
O2 0.01854 0.02036 0.02153 0.00681 0.00000 -0.00139
O3 0.01659 0.01164 0.02303 0.00584 0.00210 0.00070
O4 0.01366 0.02230 0.02003 -0.00097 -0.00350 0.00209
O5 0.01366 0.01551 0.02554 -0.00097 0.00280 0.00209
O6 0.00878 0.03879 0.01502 0.00097 -0.00350 0.00070
O7 0.00878 0.03685 0.02404 0.00292 -0.00140 0.01045
O8 0.01854 0.01842 0.01052 -0.00097 0.00140 0.00139
F9 0.01952 0.02036 0.01402 -0.00195 0.00000 -0.00070
O10 0.01659 0.01745 0.02354 0.00000 0.00000 -0.00767
O11 0.02635 0.01939 0.01703 0.00000 0.00000 -0.00070
O12 0.02342 0.03006 0.00901 0.00000 0.00000 0.00209
O-H13 0.02440 0.02909 0.01953 0.00000 0.00000 -0.00209
O14 0.01366 0.02327 0.02203 0.00000 0.00000 -0.00627
O-H15 0.02537 0.02036 0.04256 0.00000 0.00000 -0.01254

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
8.082 Å	(70)
6.949 Å	(40)
5.250 Å	(40)
3.282 Å	(100)
3.182 Å	(40)
2.841 Å	(100)
2.727 Å	(100)

Comments:

Taseq Slope, Ilímaussaq complex, Greenland. The data are from the type description.

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Near-surface Processes
22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23)
Stage 4b: Highly evolved igneous rocks	>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of Semenovite-(Ce)Hide

Type Locality:

ⓘ Taseq Slope, Ilímaussaq complex, Kujalleq, Greenland

General Appearance of Type Material:

Colorless, transparent crystals, 0.1 to 1.0 mm, rarely to 10 mm, in size.

Place of Conservation of Type Material:

Mineralogical Museum, University of Copenhagen, Denmark, number 1972.1913-1915,1921,1924,1927 (cotype).

Geological Setting of Type Material:

In cavities and open fractures in albitites of an alkalic intrusive.

Associated Minerals at Type Locality:

Synonyms of Semenovite-(Ce)Hide

IMA1971-036

Semenovite

Other Language Names for Semenovite-(Ce)Hide

German:Semenovit
Semenovit-(Ce)

Russian:Семеновит-(Ce)

Spanish:Semenovita

Common AssociatesHide

Associated Minerals Based on Photo Data:

2 photos of Semenovite-(Ce) associated with Epididymite

Na₂Be₂Si₆O₁₅ · H₂O

Related Minerals - Strunz-mindat Grouping Hide

9.DN.	Letnikovite-(Ce)	(Na◻)Ca₂Ce₂[Si₇O₁₇(OH)]F₄(H₂O)₄	Mon. 2/m : B2/m
9.DN.05	Emeleusite	Li₂Na₄Fe₂Si₁₂O₃₀	Orth. mmm (2/m 2/m 2/m)
9.DN.05	Tuhualite	NaFe²⁺Fe³⁺Si₆O₁₅	Orth. mmm (2/m 2/m 2/m) : Cmca
9.DN.05	Zektzerite	LiNaZrSi₆O₁₅	Orth. mmm (2/m 2/m 2/m) : Cmca
9.DN.15	Ashcroftine-(Y)	K₅Na₅(Y,Ca)₁₂Si₂₈O₇₀(OH)₂(CO₃)₈ · 8H₂O	Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
9.DN.15	Ashcroftine-(Ce)	K₅Na₅(Ce,Ca)₁₂Si₂₈O₇₀(OH)₂(CO₃)₈ · 8H₂O	Tet.

Other InformationHide

Health Risks:

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

Internet Links for Semenovite-(Ce)Hide

mindat.org URL:

https://www.mindat.org/min-3615.html
Please feel free to link to this page.

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for Semenovite-(Ce)Hide

Reference List:

Petersen, Ole V., Rönsbo, Jörn G. (1972) Semenovite — a new mineral from the Ilímaussaq alkaline intrusion, south Greenland. Lithos, 5 (2) 163-173 doi:10.1016/0024-4937(72)90067-9

Fleischer, M. (1973) New mineral names. American Mineralogist, 58, 1111-1115 (1114).

Mazzi, Fiorenzo, Ungaretti, Luciano, Dal Negro, Alberto, Petersen, Ole V., Rönsbo, Jörn G. (1979) The crystal structure of semenovite. American Mineralogist, 64 (1-2) 202-210

(2023) Semenovite-(Ce) Handbook of Mineralogy. Mineralogical Society of America

Localities for Semenovite-(Ce)Hide

This 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.

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Greenland
Kujalleq ⓘ Ilímaussaq complex	Petersen (2001)
ⓘ Taseq Slope (TL)	Petersen et al. (1972)

Semenovite-(Ce)

About Semenovite-(Ce)Hide

Unique IdentifiersHide

IMA Classification of Semenovite-(Ce)Hide

Classification of Semenovite-(Ce)Hide

Mineral SymbolsHide

Physical Properties of Semenovite-(Ce)Hide

Optical Data of Semenovite-(Ce)Hide

Chemistry of Semenovite-(Ce)Hide

Crystallography of Semenovite-(Ce)Hide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of Semenovite-(Ce)Hide

Synonyms of Semenovite-(Ce)Hide

Other Language Names for Semenovite-(Ce)Hide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for Semenovite-(Ce)Hide

References for Semenovite-(Ce)Hide

Localities for Semenovite-(Ce)Hide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide