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Ciprianiite

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Formula:
Ca4[(Th,U)(REE)]Al◻2(Si4B4O22)(OH,F)2
System:
Monoclinic
Colour:
Brown
Lustre:
Vitreous
Hellandite group mineral. REE is primarily Ce and Nd, with minor La, Pr and Sm.

Classification of Ciprianiite

Approved 2001
9.DK.20

9 : SILICATES (Germanates)
D : Inosilicates
K : Inosilicates with 5-periodic single chains
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First Recorded Occurrence of Ciprianiite

Physical Properties of Ciprianiite

Vitreous
Colour:
Brown

Crystallography of Ciprianiite

Crystal System:
Monoclinic

Optical Data of Ciprianiite

Type:
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:
High
Dispersion:
r > v strong

Chemical Properties of Ciprianiite

Formula:
Ca4[(Th,U)(REE)]Al◻2(Si4B4O22)(OH,F)2
Essential elements:
All elements listed in formula:

Relationship of Ciprianiite to other Species

9.DK.05BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
9.DK.05LithiomarsturiteLiCa2Mn2Si5O14(OH)
9.DK.05ManganbabingtoniteCa2(Mn,Fe)FeSi5O14(OH)
9.DK.05MarsturiteNaCaMn3Si5O14(OH)
9.DK.05Nambulite(Li,Na)Mn4Si5O14(OH)
9.DK.05Natronambulite(Na,Li)(Mn,Ca)4Si5O14OH
9.DK.05RhodoniteMnSiO3
9.DK.05ScandiobabingtoniteCa2(Fe2+,Mn)ScSi5O14(OH)
9.DK.05Fowlerite
9.DK.10SantaclaraiteCaMn4[Si5O14OH](OH) · H2O
9.DK.15SaneroiteNa2(Mn,Mn)10Si11VO34(OH)4
9.DK.20Hellandite-(Y)(Ca,REE)4Y2Al(Be,Li)2-xB4Si4O22(OH)2
9.DK.20Tadzhikite-(Ce)(Ca,Ce)4(Ce,Y)2(Ti4+,Fe3+,Al)[B4Si4O22](OH)2
9.DK.20Mottanaite-(Ce)Ca4(CeCa)AlBe2(Si4B4O22)O2
9.DK.20Hellandite-(Ce)(Ca,REE)4Ce2Al(Be,Li)2-xB4Si4O22(OH)2

Other Names for Ciprianiite

Name in Other Languages:

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.

References for Ciprianiite

Reference List:
American Mineralogist (2002): 87: 739–744, 745-752.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Ciprianiite

Localities for Ciprianiite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy
 
  • Latium
    • Viterbo Province
      • Vico Lake
        • Vetralla
American Mineralogist (2002): 87: 739–744
Mineral and/or Locality  
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