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Mottanaite-(Ce)
A valid IMA mineral species
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About Mottanaite-(Ce)
Annibale Mottana
Formula:
Ca4(Ce,REE)Σ2Al(Be1.5◻0.5)Σ2[B4Si4O22]O2
Formerly Ca4(CeCa)AlBe2(Si4B4O22)O2; changed due to approval of the IMA 18-D proposal
Colour:
Brown
Lustre:
Vitreous
Specific Gravity:
3.61
Crystal System:
Monoclinic
Member of:
Name:
Named in 2002 by Giancarlo Della Ventura, Paola Bonazzi, Roberta Oberti, and Luisa Ottolini in honour of Annibale Mottana (b. 1940), Professor of Mineralogy, University of Roma Tre, "in recognition of his leadership and support of investigations and cataloguing of the Latium minerals, during which the mottanaite-(Ce) sample was found". The suffix denotes the cerium content.
This page provides mineralogical data about Mottanaite-(Ce).
Unique Identifiers
Mindat ID:
10798
Long-form identifier:
mindat:1:1:10798:3
Similar Names
| Mutinaite | A valid IMA mineral species | Na3Ca4Si85Al11O192 · 60H2O |
IMA Classification of Mottanaite-(Ce)
Approved
IMA Formula:
Ca4Ce3+2Al(Be1.5◻0.5)[B4Si4O22]O2
Approval year:
2001
First published:
2002
Approval history:
2018: Formula changed (IMA 18-D)
Classification of 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 |
|---|---|---|
| Mot-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 Mottanaite-(Ce)
Vitreous
Transparency:
Transparent, Translucent
Colour:
Brown
Streak:
White
Tenacity:
Brittle
Cleavage:
None Observed
None
None
Fracture:
Conchoidal
Density:
3.61(4) g/cm3 (Measured) 3.88 g/cm3 (Calculated)
Optical Data of Mottanaite-(Ce)
Type:
Biaxial (-)
RI values:
nα = 1.68 nβ = 1.694 nγ = 1.708
2V:
Measured: ~90°
Max. Birefringence:
δ = 0.028
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.
No measured or calculated 2V is on file for this mineral, so the value used here (89°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
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.
No measured or calculated 2V is on file for this mineral, so the value used here (89°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Dispersion:
r > v, strong.
Chemistry of Mottanaite-(Ce)
Mindat Formula:
Ca4(Ce,REE)Σ2Al(Be1.5◻0.5)Σ2[B4Si4O22]O2
Formerly Ca4(CeCa)AlBe2(Si4B4O22)O2; changed due to approval of the IMA 18-D proposal
Formerly Ca4(CeCa)AlBe2(Si4B4O22)O2; changed due to approval of the IMA 18-D proposal
Crystallography of Mottanaite-(Ce)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/a
Cell Parameters:
a = 19.032(9) Å, b = 4.746(4) Å, c = 10.248(5) Å
β = 110.97(5)°
β = 110.97(5)°
Ratio:
a:b:c = 4.01 : 1 : 2.159
Unit Cell V:
864.3 ų
Z:
2
Morphology:
Tabular on {010}.
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0002818 | Mottanaite-(Ce) | Della Ventura G, Bonazzi P, Oberti R, Ottolini L (2002) Ciprianiite and mottanaite-(Ce), two new minerals of the hellandite group from Latium (Italy) American Mineralogist 87 739-744 |  | 2002 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.854 Å | (100) |
| 2.916 Å | (86) |
| 2.646 Å | (86) |
| 3.085 Å | (85) |
| 2.647 Å | (84) |
| 2.635 Å | (84) |
| 3.243 Å | (80) |
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 Mottanaite-(Ce)
General Appearance of Type Material:
Small (<0.5 mm), brown, tabular crystals.
Place of Conservation of Type Material:
Mineralogy Museum, University of Rome, Italy, 30023/1.
Geological Setting of Type Material:
In miarolitic cavities in alkali-syenitic ejecta enclosed in pyroclastic formations.
Associated Minerals at Type Locality:
Synonyms of Mottanaite-(Ce)
Other Language Names for Mottanaite-(Ce)
Relationship of 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 |
| Ferri-mottanaite-(Ce) | Ca4Ce2Fe3+(Be1.5◻0.5)[Si4B4O22]O2 | Mon. 2/m : P2/b |
| Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 | Mon. 2/m : P2/b |
| Hellandite-(Y) | (Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2 | Mon. 2/m : P2/b |
| Tadzhikite-(Ce) | Ca4Ce3+2Ti◻2(B4Si4O22)(OH)2 | Mon. 2/m : P2/b |
Common Associates
Associations Based on Photo Data:
| 1 photo of Mottanaite-(Ce) associated with Feldspar Group |
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 | Ferri-mottanaite-(Ce) | Ca4Ce2Fe3+(Be1.5◻0.5)[Si4B4O22]O2 |
| 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 | 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 |
Fluorescence of Mottanaite-(Ce)
Not fluorescent.
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 Mottanaite-(Ce)
mindat.org URL:
https://www.mindat.org/min-10798.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Mottanaite-(Ce)
Reference List:
Ventura, Giancarlo Della, Bonazzi, Paola, Oberti, Roberta, Ottolini, Luisa (2002) Ciprianiite and mottanaite-(Ce), two new minerals of the hellandite group from Latium (Italy) American Mineralogist, 87 (5) 739-744 doi:10.2138/am-2002-5-617
Oberti, Roberta, Ventura, Giancarlo Della, Ottolini, Luisa, Hawthorne, Frank C., Bonazzi, Paola (2002) Re-definition, nomenclature and crystal-chemistry of the hellandite group. American Mineralogist, 87 (5) 745-752 doi:10.2138/am-2002-5-618
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 Mottanaite-(Ce)
Showing 3 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| Ventura et al. (2002) |
| M.E. Ciriotti (2006) +1 other reference |
| Locality description |
Quick NavTopAbout Mottanaite-(Ce)Unique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Monte Cavalluccio, Campagnano di Roma, Metropolitan City of Rome Capital, Lazio, Italy