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About CiprianiiteHide

Formerly Ca4[(Th,U)(REE)]Al◻2(Si4B4O22)(OH,F)2; changed due to approval of the IMA 18-D proposal
Crystal System:
Named by G. Della Ventura, P. Bonazzi, R. Oberti, and L. Ottolini in 2002 in honor of Curzio Cipriani (26 November 1927, Florence, Italy - 6 December 2007, Florence, Italy), Professor of Mineralogy and Head of the Museum of Mineralogy (later the Musuem of Natural History), at the University of Florence, for his contribution to mineral systematics. He was on the Commission of Museums of the International Mineralogical Association for more than twenty years and he founded the journal Museologia Scientifica.
Hellandite group mineral. REE is primarily Ce and Nd, with minor La, Pr and Sm.

First mineral to combine Th and B as essential components (the second is UM1995-43-SiO:BTh).

Classification of CiprianiiteHide

Approval Year:

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

Physical Properties of CiprianiiteHide


Optical Data of CiprianiiteHide

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 CiprianiiteHide


Formerly Ca4[(Th,U)(REE)]Al◻2(Si4B4O22)(OH,F)2; changed due to approval of the IMA 18-D proposal
IMA Formula:

Crystallography of CiprianiiteHide

Crystal System:

Type Occurrence of CiprianiiteHide

Synonyms of CiprianiiteHide

Other Language Names for CiprianiiteHide

Relationship of Ciprianiite to other SpeciesHide

Other Members of this group:
Ferri-mottanaite-(Ce) Ca4Ce2Fe3+(Be1.50.5)[Si4B4O22]O2Mon. 2/m : P2/b
Hellandite-(Ce)(Ca,REE)4Ce2Al□2(B4Si4O22) (OH)2Mon. 2/m
Hellandite-(Y)(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2Mon.
Mottanaite-(Ce)Ca4(Ce,REE)Σ2Al(Be1.50.5)Σ2[B4Si4O22]O2Mon. 2/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Ciprianiite associated with Hellandite

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.20Mottanaite-(Ce)Ca4(Ce,REE)Σ2Al(Be1.50.5)Σ2[B4Si4O22]O2Mon. 2/m
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 CiprianiiteHide

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.
Grew, E.S., Anovitz, L.M. (2002) BORON: Mineralogy, Petrology and Geochemistry, second edition, 864 pages.
Mandarino, J.A. (2003) New minerals. Canadian Mineralogist: 41: 803-828.

Internet Links for CiprianiiteHide

Localities for CiprianiiteHide

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.
  • Lazio
    • Metropolitan City of Rome Capital
      • Sacrofano Caldera
        • Campagnano di Roma
Chukanov N. V., Allori R. (2008): Cancrinite-group minerals from the Sacrofano caldera, Rome, Latium, Italy. Mineralogical Almanac, 13c, 20-35; Чуканов Н. В., Аллори Р. (2008): Минералы группы канкринита из кальдеры Сакрофано (Лацио, Италия). Минералогический альманах, 13c, 20-35.
    • Viterbo Province
      • Vetralla
American Mineralogist (2002): 87: 739–744
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