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Ciprianiite

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Tre Croci, Vetralla, Vico Lake, Viterbo Province, Latium, Italy
© 2004 JBS

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Formula:
Ca
 
4
[(Th,U)(REE)]Al[]
 
2
(Si
 
4
B
 
4
O
 
22
)(OH,F)
 
2
System:MonoclinicColour:Brown
Lustre:Vitreous


Hellandite group mineral. REE is primarily Ce and Nd, with minor La, Pr and Sm.

Classification of Ciprianiite

IMA status:Approved 2001
Nickel-Strunz 10th (pending) edition ID:9.DK.20

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

Type Locality:Tre Croci, Vetralla, Vico Lake, Viterbo Province, Latium, Italy

Physical Properties of Ciprianiite

Lustre: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
Maximum Birefringence:δ = 0.028

Chart 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:
Ca
 
4
[(Th,U)(REE)]Al[]
 
2
(Si
 
4
B
 
4
O
 
22
)(OH,F)
 
2
Essential elements:Al, B, Ca, H, O, Si, Th
All elements listed in formula:Al, B, Ca, F, H, O, Si, Th, U

Relationship of Ciprianiite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DK.05Babingtonite
Ca
 
2
(Fe,Mn)FeSi
 
5
O
 
14
(OH)
9.DK.05Lithiomarsturite
LiCa
 
2
Mn
 
2
Si
 
5
O
 
14
(OH)
9.DK.05Manganbabingtonite
Ca
 
2
(Mn,Fe)FeSi
 
5
O
 
14
(OH)
9.DK.05Marsturite
NaCaMn
 
3
Si
 
5
O
 
14
(OH)
9.DK.05Nambulite
(Li,Na)Mn
 
4
Si
 
5
O
 
14
(OH)
9.DK.05Natronambulite
(Na,Li)(Mn,Ca)
 
4
Si
 
5
O
 
14
OH
9.DK.05Rhodonite
MnSiO
 
3
9.DK.05Scandiobabingtonite
Ca
 
2
(Fe
2+
 
,Mn)ScSi
 
5
O
 
14
(OH)
9.DK.05Fowlerite
9.DK.10Santaclaraite
CaMn
 
4
[Si
 
5
O
 
14
OH](OH)·H
 
2
O
9.DK.15Saneroite
Na
 
2
(Mn,Mn)
 
10
Si
 
11
VO
 
34
(OH)
 
4
9.DK.20Hellandite-(Y)
(Ca,Y)
 
6
(Al,Fe
3+
 
)Si
 
4
B
 
4
O
 
20
(OH)
 
4
9.DK.20Tadzhikite-(Ce)
(Ca,Ce)
 
4
(Ce,Y)
 
2
(Ti
4+
 
,Fe
3+
 
,Al)[B
 
4
Si
 
4
O
 
22
](OH)
 
2
9.DK.20Mottanaite-(Ce)
Ca
 
4
(CeCa)AlBe
 
2
(Si
 
4
B
 
4
O
 
22
)O
 
2
9.DK.20Hellandite-(Ce)
(Ca,Ce)
 
6
(Al,Fe
3+
 
)Si
 
4
B
 
4
O
 
20
(OH)
 
4

Other Names for Ciprianiite

Synonyms:
IMA2001-021
Other Languages:
German:Ciprianiit
Russian:Киприаниит
Spanish:Ciprianiita

Other Information

Health Warning: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

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    Localities for Ciprianiite

    (TL) indicates type locality. ? 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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