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Hellandite-(Ce)

Big Photo

Tre Croci, Vetralla, Vico Lake, Viterbo Province, Latium, Italy
© 2008 Jesse Crawford

Formula:
(Ca,Ce)
 
6
(Al,Fe
3+
 
)Si
 
4
B
 
4
O
 
20
(OH)
 
4
Colour:Light green


Hellandite Group.

Classification of Hellandite-(Ce)

IMA status:Approved 2001
Strunz 8th edition ID:8/F.36-09
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 Hellandite-(Ce)

Type Locality:Campo Padella, Capranica, Ronciglione, Vico Lake, Viterbo Province, Latium, Italy

Physical Properties of Hellandite-(Ce)

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Light green

Chemical Properties of Hellandite-(Ce)

Formula:
(Ca,Ce)
 
6
(Al,Fe
3+
 
)Si
 
4
B
 
4
O
 
20
(OH)
 
4
Essential elements:
All elements listed in formula:Al, B, Ca, Ce, Fe, H, O, Si

Relationship of Hellandite-(Ce) 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.10Bostwickite
CaMn
 
6
Si
 
3
O
 
16
·7H
 
2
O
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
(Ca,Y)
 
2
(Ti
4+
 
,Fe
3+
 
,Al)[B
 
4
Si
 
4
O
 
22
(O,OH)
 
6
](OH)
 
2
9.DK.20Mottanaite-(Ce)
Ca
 
4
(CeCa)AlBe
 
2
(Si
 
4
B
 
4
O
 
22
)O
 
2
9.DK.20Ciprianiite
Ca
 
4
[(Th,U)(REE)]Al
 
2
(Si
 
4
B
 
4
O
 
22
)(OH, F)
 
2
]

Other Names for Hellandite-(Ce)

Synonyms:
IMA2001-019
Russian names:
Гелландит-(Ce)

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 Hellandite-(Ce)

Reference List:Oberti, R., Ottolini, L., Cámara, F., and Della Ventura, G. (1999) Crystal structure refinement of non-metamict Th-rich hellandite-(Ce) from Latium (Italy) and crystal chemistry of the hellandite-group minerals. American Mineralogist: 84: 913-921.

Oberti, R., G. Della Ventura, L. Ottolini, F. C. Hawthorne, P. Bonazzi (2002): Re-definition, nomenclature and crystal chemistry of the hellandite group. American Mineralogist 87, 745-752.
www.geo.vu.nl/~ima-cnmmn/hellandite.pdf

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

Internet Links for Hellandite-(Ce)

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    Localities for Hellandite-(Ce)

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    The 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.
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    (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
          • Ronciglione
            • Capranica
    		Lapis 11(1999), 27; Am. Mineral. 84 (1999), 913-921; Am. Mineral. 87 (2002), 745-752
    Carlini, R., Signoretti, E., 2003. Località minori del vulcano Vicano: Villa S.Giovanni in Tuscia e Mazzocchio. Il Cercapietre. Not. del Gruppo Mineralogico Romano, 1-2: 33-41
    USA
     
    • Idaho
      • Boise Co.
    		The Canadian Mineralogist, V 42, 2004, pp. 121-124.
    Mineral and/or Locality
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