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Fluorcalciobritholite

Big Photo

In den Dellen quarries, Niedermendig, Mendig, Laach lake volcanic complex, Eifel Mts, Rhineland-Palatinate, Germany
© C.H.M.-Schäfer

Show Fluorcalciobritholite Photos (3)
Formula:
(Ca,Ce)
 
5
 (SiO
 
4
,PO
 
4
)
 
3
F
System:HexagonalColour:Pinkish to brown
Hardness:5½


Britholite Group

Classification of Fluorcalciobritholite

IMA status:Approved 2006
Strunz 8th edition ID:8/B.27-45
Strunz 9th edition ID:9.AH.25
Nickel-Strunz 10th (pending) edition ID:9.AH.25

9 : SILICATES (Germanates)
A : Nesosilicates
H : Nesosilicates with CO3, SO4, PO4, etc.
Dana 8th edition ID:52.4.12.7

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
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Type Occurrence of Fluorcalciobritholite

Type Locality:Tuliok River head, East slope, Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
General Appearance of Type Material:grains and minute elongated crystals
Year of Discovery:1977
Associated Minerals at type locality:
SodaliteOrthoclaseNepheline

Occurrences of Fluorcalciobritholite

Geological Setting:in veinlets in a alkaline complex

Physical Properties of Fluorcalciobritholite

Diaphaneity (Transparency):Transparent, Translucent
Colour:Pinkish to brown
Streak:white
Hardness (Mohs):5½
Density (measured):4.2 g/cm3

Crystallography of Fluorcalciobritholite

Crystal System:Hexagonal
Class (H-M):6/m - Dipyramidal
Space Group:P63/m
Cell Parameters:a = 9.58(7) Å, c = 6.985(4) Å
Ratio:a:c = 1 : 0.729
Unit Cell Volume:V 555.2 ų
Z:2
Morphology:long-prismatic hexagonal crystals up to 0.5 x 10 mm
X-Ray Powder Diffraction:
d-spacingIntensity
3.51 (45)
3.15 (70)
2.85 (100)
2.78 (60)
1.965 (25)
1.931 (20)
1.236 (25)
1.122 (30)

Optical Data of Fluorcalciobritholite

Type:Uniaxial (-)
RI values: nω = 1.735() nε = 1.730(5)
Maximum Birefringence:δ = 0.005

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Fluorcalciobritholite

Formula:
(Ca,Ce)
 
5
 (SiO
 
4
,PO
 
4
)
 
3
F
Idealised Formula:
Ca
 
3
Ce
 
2
 (SiO
 
4
)
 
2
(PO
 
4
)F
All elements listed in formula:Ca, Ce, F, O, P, Si

Relationship of Fluorcalciobritholite to other Species

Member of Group:
Britholite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
9.AH.05Iimoriite-(Y)
Y
 
2
[CO
 
3
|SiO
 
4
]
9.AH.10Tundrite-(Ce)
Na
 
2
Ce
 
2
TiO
 
2
(SiO
 
4
)(CO
 
3
)
 
2
9.AH.10Tundrite-(Nd)
Na
 
3
(Nd,La)
 
4
(Ti,Nb)
 
2
(SiO
 
4
)
 
2
(CO
 
3
)
 
3
O
 
4
(OH)·2H
 
2
O
9.AH.15Paraspurrite
Ca
 
5
[CO
 
3
|(SiO
 
4
)
 
2
]
9.AH.15Spurrite
Ca
 
5
[CO
 
3
|(SiO
 
4
)
 
2
]
9.AH.20Ternesite
Ca
 
5
[SO
 
4
|(SiO
 
4
)
 
2
]
9.AH.25Britholite-(Ce)
Ca
 
2
(Ce,Ca)
 
3
[(OH,F)|(SiO
 
4
,PO
 
4
)
 
3
]
9.AH.25Britholite-(Y)
Ca
 
2
(Y,Ca)
 
3
[(OH,F)|(SiO
 
4
,PO
 
4
)
 
3
]
9.AH.25Ellestadite-(Cl)
Ca
 
10
[Cl
 
2
|(SO
 
4
)
 
3
|(SiO
 
4
)
 
3
]
9.AH.25Fluorbritholite-(Ce)
Ca
 
2
(Ce,Ca)
 
3
[(F,OH)|(SiO
 
4
,PO
 
4
)
 
3
]
9.AH.25Ellestadite-(F)
Ca
 
10
[(F,Cl,OH)
 
2
|(SO
 
4
)
 
3
|(SiO
 
4
)
 
3
]
9.AH.25Ellestadite-(OH)
Ca
 
10
[(OH,Cl,F)
 
2
|(SO
 
4
)
 
3
|(SiO
 
4
)
 
3
]
9.AH.25Mattheddleite
Pb
 
5
(Si
 
1.5
S
 
1.5
)O
 
12
(Cl,OH)
9.AH.25Tritomite-(Ce)
(Ce,La,Y,Th)
 
5
(Si,B)
 
3
(O,OH,F)
 
13
9.AH.25Tritomite-(Y)
(Y,Ca,La,Fe)
 
5
(Si,B,Al)
 
3
(O,OH,F)
 
13
9.AH.25IMA2009-005
Ca
 
2
(Y,Ca)
 
3
[(F,OH)|(SiO
 
4
,PO
 
4
)
 
3
]

Other Names for Fluorcalciobritholite

Synonyms:
IMA2006-010
Other Languages:
German:Fluorcalciobritholith

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 Fluorcalciobritholite

Reference List:Igor V. Pekov ; Marco Pasero ; Asiya N. Yaskovskaya ; Nikita V. Chukanov ; Dmitry Yu. Pushcharovsky ; Stefano Merlino ; Natalia V. Zubkova ; Natalia N. Kononkova ; Yury P. Men'shikov ; Aleksandr E. Zadov: "Fluorcalciobritholite, (Ca,REE)5[(Si,P)O4]3F, a new mineral: description and crystal chemistry": European Journal of Mineralogy: 19: 95-103. [abstract: Am. Min. 93,252 (2008)]

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    Localities for Fluorcalciobritholite

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