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About Mottanaite-(Ce)Hide

Annibale Mottana
Formerly Ca4(CeCa)AlBe2(Si4B4O22)O2; changed due to approval of the IMA 18-D proposal
Crystal System:
Named in 2002 by Giancarlo Della Ventura, Paola Bonazzi, Roberta Oberti, and Luisa Ottolini in honor of Annibale Mottana, Professor of Mineralogy, University of Roma Tre, "in recognition of his leaderhip 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).

Classification of Mottanaite-(Ce)Hide

Approval Year:
Approval History:
2018: Formula changed (IMA 18-D)

9 : SILICATES (Germanates)
D : Inosilicates
K : Inosilicates with 5-periodic single chains

Physical Properties of Mottanaite-(Ce)Hide


Optical Data of Mottanaite-(Ce)Hide

Biaxial (-)
RI values:
nα = 1.680 nβ = 1.694 nγ = 1.708
Max Birefringence:
δ = 0.028
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r > v strong

Chemical Properties of Mottanaite-(Ce)Hide


Formerly Ca4(CeCa)AlBe2(Si4B4O22)O2; changed due to approval of the IMA 18-D proposal
IMA Formula:

Crystallography of Mottanaite-(Ce)Hide

Crystal System:
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 19.032(9) Å, b = 4.746(4) Å, c = 10.248(5) Å
β = 110.97(5)°
a:b:c = 4.01 : 1 : 2.159
Unit Cell V:
864.3 ų
Space group P2/a.

Type Occurrence of Mottanaite-(Ce)Hide

Synonyms of Mottanaite-(Ce)Hide

Other Language Names for Mottanaite-(Ce)Hide

Relationship of Mottanaite-(Ce) to other SpeciesHide

Other Members of this group:
Hellandite-(Ce)(Ca,REE)4Ce2Al□2(B4Si4O22) (OH)2Mon. 2/m
Hellandite-(Y)(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2Mon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Feldspar Group1 photo of Mottanaite-(Ce) associated with Feldspar Group on

Related Minerals - Nickel-Strunz GroupingHide

9.DK.05BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)Tric. 1 : P1
9.DK.05MarsturiteNaCaMn3Si5O14(OH)Tric. 1 : P1
9.DK.05RhodoniteMn2+SiO3Tric. 1
9.DK.10SantaclaraiteCaMn4[Si5O14OH](OH) · H2OTric.
9.DK.20Hellandite-(Y)(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2Mon.
9.DK.20Hellandite-(Ce)(Ca,REE)4Ce2Al□2(B4Si4O22) (OH)2Mon. 2/m

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.

References for Mottanaite-(Ce)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Oberti, R., Ventura, G.D., Ottolini, L., Hawthorne, F.C., Bonazzi, P. (2002) Re-definition, nomenclature, and crystal-chemistry of the hellandite group. American Mineralogist: 87: 745-752.

Internet Links for Mottanaite-(Ce)Hide

Localities for Mottanaite-(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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
  • Latium
    • Rome Province
      • Sacrofano Caldera
        • Campagnano di Roma
American Mineralogist (2002): 87: 739-744, 745-752.
    • Viterbo Province
      • Vico volcanic complex (Vico Lake)
        • Vetralla
- M.E. Ciriotti (2006) EPMA+SIMS probed [a mottanaite-(Ce) with Al0.5Fe3+0.5] - Ciriotti, M.E. & Biagioni, C. (2011): Pot-pourri 2011: identificazioni di minerali di interesse. Micro, 3/2011, 125-133
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