Ferri-mottanaite-(Ce)
A valid IMA mineral species
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About Ferri-mottanaite-(Ce)
Formula:
Ca4Ce2Fe3+(Be1.5◻0.5)[Si4B4O22]O2
Crystal System:
Monoclinic
Member of:
Name:
Named after its relation to mottanaite-(Ce).
The first Fe3+-dominant hellandite Group mineral.
Unique Identifiers
Mindat ID:
53254
Long-form identifier:
mindat:1:1:53254:1
IMA Classification of Ferri-mottanaite-(Ce)
Approved
IMA Formula:
Ca4Ce3+2Fe3+(Be1.5◻0.5)[Si4B4O22]O2
Approval year:
2018
First published:
2019
Type description reference:
Oberti, Roberta, Langone, Antonio, Boiocchi, Massimo, Bernabè, Ezio, Hawthorne, Frank C. (2019) News from the hellandite group: the redefinition of mottanaite and ciprianiite and the new mineral description of ferri-mottanaite-(Ce), the first Fe3+-dominant hellandite. European Journal of Mineralogy, 31 (4) 799-806 doi:10.1127/ejm/2019/0031-2858
Classification of Ferri-mottanaite-(Ce)
9.DK.20
9 : SILICATES (Germanates)
D : Inosilicates
K : Inosilicates with 5-periodic single chains
9 : SILICATES (Germanates)
D : Inosilicates
K : Inosilicates with 5-periodic single chains
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Fmot-Ce | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Optical Data of Ferri-mottanaite-(Ce)
Type:
Biaxial (-)
RI values:
nα = 1.748(5) nβ = 1.748(5) nγ = 1.773(5)
2V:
Measured: 1.773° (5), Calculated: 82.5°
Max. Birefringence:
δ = 0.025
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Chemistry of Ferri-mottanaite-(Ce)
Mindat Formula:
Ca4Ce2Fe3+(Be1.5◻0.5)[Si4B4O22]O2
Element Weights:
Crystallography of Ferri-mottanaite-(Ce)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/a
Cell Parameters:
a = 19.0548(9) Å, b = 4.7468(2) Å, c = 10.2560(5) Å
β = 110.906(2)°
β = 110.906(2)°
Ratio:
a:b:c = 4.014 : 1 : 2.161
Unit Cell V:
866.58 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.745 Å | (33) |
| 3.453 Å | (36) |
| 3.246 Å | (43) |
| 3.086 Å | (44) |
| 2.919 Å | (44) |
| 2.857 Å | (50) |
| 2.648 Å | (100) |
| 1.904 Å | (48) |
Reference:
Oberti, Roberta, Langone, Antonio, Boiocchi, Massimo, Bernabè, Ezio, Hawthorne, Frank C. (2019) News from the hellandite group: the redefinition of mottanaite and ciprianiite and the new mineral description of ferri-mottanaite-(Ce), the first Fe3+-dominant hellandite. European Journal of Mineralogy, 31 (4) 799-806 doi:10.1127/ejm/2019/0031-2858
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Ferri-mottanaite-(Ce)
Place of Conservation of Type Material:
Collections of the Museo di Mineralogia, Dipartimento di Scienze della Terra e dell'Ambiente, Università di Pavia, catalogue number 2018-02.
Empirical Formula of Type Material:
X(Ca)Y4(Ca0.40REE0.93(Th,U)4+0.54◻0.13)Σ2.00 Z(Fe3+0.50Al0.23Mn3+0.17Ti4+0.17)TΣ1.07(Be1.04Li0.04◻0.92)Σ2.00[Si4.03B3.89O22] (O1.09(OH)0.38F0.53)Σ2.00
Reference:
Oberti, Roberta, Langone, Antonio, Boiocchi, Massimo, Bernabè, Ezio, Hawthorne, Frank C. (2019) News from the hellandite group: the redefinition of mottanaite and ciprianiite and the new mineral description of ferri-mottanaite-(Ce), the first Fe3+-dominant hellandite. European Journal of Mineralogy, 31 (4) 799-806 doi:10.1127/ejm/2019/0031-2858
Synonyms of Ferri-mottanaite-(Ce)
Other Language Names for Ferri-mottanaite-(Ce)
Dutch:Ferri-mottanaiet-(Ce)
German:Ferri-Mottanait-(Ce)
Relationship of Ferri-mottanaite-(Ce) to other Species
Member of:
Other Members of Hellandite Group:
| Ciprianiite | Ca4[(Th,U),Ca]Σ2Al(Be0.5◻1.5)Σ2[B4Si4O22](OH)2 | Mon. 2/m : P2/b |
| Ferri-hellandite-(Ce) | (Ca3Ce)Ce2Fe3+◻2B4Si4O22(OH)2 | Mon. 2/m : P2/b |
| Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 | Mon. 2/m |
| Hellandite-(Y) | (Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2 | Mon. 2/m : P2/b |
| Mottanaite-(Ce) | Ca4(Ce,REE)Σ2Al(Be1.5◻0.5)Σ2[B4Si4O22]O2 | Mon. 2/m |
| Tadzhikite-(Ce) | Ca4Ce3+2Ti◻2(B4Si4O22)(OH)2 | Mon. 2/m : P2/b |
Related Minerals - Strunz-mindat Grouping
| 9.DK. | Ferrorhodonite | CaMn3Fe[Si5O15] |
| 9.DK. | Vittinkiite | MnMn3Mn[Si5O15] |
| 9.DK. | Ferri-hellandite-(Ce) | (Ca3Ce)Ce2Fe3+◻2B4Si4O22(OH)2 |
| 9.DK. | Shijiangshanite | Pb3CaAl(Si5O14)(OH)3 · 3H2O |
| 9.DK.05 | Nambulite | LiMn2+4Si5O14(OH) |
| 9.DK.05 | Marsturite | NaCaMn3Si5O14(OH) |
| 9.DK.05 | Natronambulite | (Na,Li)(Mn,Ca)4Si5O14OH |
| 9.DK.05 | Rhodonite | CaMn3Mn[Si5O15] |
| 9.DK.05 | Scandiobabingtonite | (Ca,Na)2(Fe2+,Mn)(Sc,Fe3+)Si5O14(OH) |
| 9.DK.05 | Lithiomarsturite | LiCaMn3Si5O14(OH) |
| 9.DK.05 | Manganbabingtonite | Ca2Mn2+Fe3+Si5O14(OH) |
| 9.DK.05 | Fowlerite | (Mn2+,Zn,Ca)SiO3 |
| 9.DK.05 | Babingtonite | Ca2Fe2+Fe3+Si5O14(OH) |
| 9.DK.10 | Santaclaraite | CaMn4[Si5O14OH](OH) · H2O |
| 9.DK.15 | Saneroite | NaMn2+5[Si5O14(OH)](VO3)(OH) |
| 9.DK.20 | Tadzhikite-(Ce) | Ca4Ce3+2Ti◻2(B4Si4O22)(OH)2 |
| 9.DK.20 | 'Hellandite-(Yb)' | (Ca,Y)4(Yb,Y)2(Al,Fe3+,Ti4+)(Be,Li)2[B4Si4O22](O,F,OH)2 |
| 9.DK.20 | Mottanaite-(Ce) | Ca4(Ce,REE)Σ2Al(Be1.5◻0.5)Σ2[B4Si4O22]O2 |
| 9.DK.20 | Ciprianiite | Ca4[(Th,U),Ca]Σ2Al(Be0.5◻1.5)Σ2[B4Si4O22](OH)2 |
| 9.DK.20 | Hellandite-(Y) | (Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2 |
| 9.DK.20 | Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
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.
Internet Links for Ferri-mottanaite-(Ce)
mindat.org URL:
https://www.mindat.org/min-53254.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Ferri-mottanaite-(Ce)
Reference List:
Hålenius, Ulf, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2018) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 46. European Journal of Mineralogy, 30 (6) 1181-1189 doi:10.1127/ejm/2018/0030-2819
Oberti, Roberta, Langone, Antonio, Boiocchi, Massimo, Bernabè, Ezio, Hawthorne, Frank C. (2019) News from the hellandite group: the redefinition of mottanaite and ciprianiite and the new mineral description of ferri-mottanaite-(Ce), the first Fe3+-dominant hellandite. European Journal of Mineralogy, 31 (4) 799-806 doi:10.1127/ejm/2019/0031-2858
Perna, Maria; Zaccaria, Daria; Rosatelli, Gianluigi; Stoppani, Francesco; Curti, Ezio; Spratt, John; Humphreys-Williams, Emma; Najorka, Jens; Brownscombe, Will; Nestola, Fabrizio; et al. (2021) Dissolution-Repackaging of Hellandite-(Ce), Mottanaite-(Ce)/Ferri-Mottanaite-(Ce). Minerals, 11 (6). 610 doi:10.3390/min11060610
Localities for Ferri-mottanaite-(Ce)
Showing 1 localities.
ⓘ - 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.
- 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).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| Hålenius et al. (2018) +1 other reference |
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Vico volcanic complex, Viterbo Province, Lazio, Italy