Loparite-(Ce) Mineral Data

Loparite-(Ce) Mineral Data +

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General Loparite-(Ce) Information

Chemical Formula:

(Ce,Na,Ca)2(Ti,Nb)2O6

Composition:

Molecular Weight = 164.60 gm

Sodium 8.38 % Na 11.30 % Na₂O

Calcium 2.43 % Ca 3.41 % CaO

Lanthanum 8.44 % La 9.90 % La₂O₃

Cerium 17.03 % Ce 19.94 % Ce₂O₃

Titanium 23.27 % Ti 38.82 % TiO₂

Niobium 11.29 % Nb 16.15 % Nb₂O₅

Oxygen 29.16 % O

______ ______

100.00 % 99.51 % = TOTAL OXIDE

Empirical Formula:

Na_0.6Ce_0.2La_0.1Ca_0.1Ti_0.8Nb_0.2O₃

Environment:

Primary mineral in differentiated nepheline syenite massifs and alkalic pegmatites, replacing perovskite in carbonatites.

IMA Status:

Valid Species (Pre-IMA) 1922

Locality:

Khibiny and Lovozero massifs, Kola peninsula, northern Russia. Link to MinDat.org Location Data.

Name Origin:

From the Russian name for the Lapps, "Lopar", inhabitants of the Kola Peninsula, Russia.

Synonym:

ICSD 24444

PDF 35-618

Loparite-(Ce) Image

Images:

Loparite-(Ce)

Comments: Sharp penetration twin of cubic loparite-(Ce) about 7 mm. across on phoenite matrix.
Location: Flora Mt., Lovosero massif, Kola Peninsula, Russia. Scale: 3.8x3.3x2.6 cm.
© Richard Dale / Dale Minerals

Images:

Loparite-(Ce) Perrierite-(Ce) Pyrochlore Zircon

Comments: Reddish black perrierite crystal, with orange-brown pyrochlore crystal, yellow-brown zircon, and grayish-black loparite.
Location: Buer, Bjorkedalen, Langesundfjord, Telemark, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Loparite-(Ce) Crystallography

Cell Dimensions:

a = 3.85, Z = 1; V = 57.07 Den(Calc)= 4.79

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: P m3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.746(1), 1.587(0.5), 1.942(0.4),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Mitchell R H , Burns P C , Chakhmouradian A R , The Canadian Mineralogist , 38 (2000) p.145-152, The crystal structures of loparite-(Ce), Sample: Loparite K

View Additional jPOWD Structure files for Loparite-(Ce)
[1] [2]

Physical Properties of Loparite-(Ce)

Cleavage:

[100] Imperfect

Color:

Black.

Density:

4.77

Diaphaniety:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Cubic Crystals - Occurs as cubic shaped crystals.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

5.5 - Knife Blade

Luster:

Adamantine - Metallic

Streak:

reddish brown

Optical Properties of Loparite-(Ce)

Gladstone-Dale:

CI meas= -0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2756,KPDmeas= 0.2767,KC= 0.2678

Optical Data:

Isotropic, n=2.26-2.38.

RL Color:

Light gray or white with a creamy tinge and brownish red internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Loparite-(Ce) in Air**
λ	R	∑ R(λ)
400 nm	18.80
420 nm	18.20
440 nm	17.80
460 nm	17.30
480 nm	17.00
500 nm	16.80
520 nm	16.60
540 nm	16.40
560 nm	16.30
580 nm	16.10
600 nm	16.10
620 nm	16.00
640 nm	15.90
660 nm	15.90
680 nm	15.90
700 nm	15.80

**Calculated Relative Intensity Colors of Loparite-(Ce) in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%
R

Calculated Properties of Loparite-(Ce)

Electron Density:

r_electron=4.41 gm/cc
note: r_{Loparite-(Ce)}=4.79 gm/cc.

Fermion Index

Fermion Index = 0.03033
Boson Index = 0.96967

Photoelectric:

PE_{Loparite-(Ce)}= 146.73 barns/electron
U=PE_{Loparite-(Ce)} x r_electron= 646.49 barns/cc.

Radioactivity:

GRapi = 24,983.65 (Gamma Ray American Petroleum Institute Units)

Loparite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Loparite-(Ce)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.36 cm	570,395	1.54E-05	24,983.65	8.21
100 gm / 3.42 cm	57,040	1.54E-06	2,498.36	0.82
10 gm / 1.59 cm	5,704	1.54E-07	249.84	0.08
1 gm / 7.36 mm	570	1.54E-08	24.98	0.01
0.1 gm / 3.42 mm	57	1.54E-09	2.50	0.00
0.01 gm / 1.59 mm	6	1.54E-10	0.25	0.00
0.001 gm / 0.74 mm	1	1.54E-11	0.02	0.00

Weight of pure Loparite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.79 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 1.27 % Th) From Sum REE Elements (25.46 % REE)

Loparite-(Ce) Classification

Dana Class:

4.3.3.3 (4)Simple Oxides

(4.3)with a cation charge of 3+ (A+++2 O3)

(4.3.3)Dana Group

4.3.3.1 Perovskite CaTiO3 P nma 2/m 2/m 2/m

4.3.3.2 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m

4.3.3.3 Loparite-(Ce) (Ce,Na,Ca)2(Ti,Nb)2O6 P m3m 4/m 3 2/m

4.3.3.4 Lueshite NaNbO3 P 222₁ 2 2 2

4.3.3.5 Tausonite SrTiO3 P m3m 4/m 3 2/m

4.3.3.6 Isolueshite! (Na,La,Ca)(Nb,Ti)O3 P m3m 4/m 3 2/m

Strunz Class:

IV/C.10-50 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.10 - Perowskite series

IV/C.10-10 Uhligite Ca3(Ti,Al,Zr)9O20 Unk Cubic

IV/C.10-20 Perovskite CaTiO3 P nma 2/m 2/m 2/m

IV/C.10-30 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m

IV/C.10-40 Tausonite SrTiO3 P m3m 4/m 3 2/m

IV/C.10-50 Loparite-(Ce) (Ce,Na,Ca)2(Ti,Nb)2O6 P m3m 4/m 3 2/m

IV/C.10-55 Isolueshite! (Na,La,Ca)(Nb,Ti)O3 P m3m 4/m 3 2/m

IV/C.10-60 Lueshite NaNbO3 P 222₁ 2 2 2

IV/C.10-70 Natroniobite NaNbO3 Mono

IV/C.10-80 Macedonite PbTiO3 P 4/mmm 4/m 2/m 2/m

Other Loparite-(Ce) Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Loparite-(Ce) :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas

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Print or Cut-and-Paste your Loparite-(Ce) Specimen Label here :

Loparite-(Ce)

(Ce,Na,Ca)2(Ti,Nb)2O6
Dana No: 4.3.3.3 Strunz No: IV/C.10-50
Locality:

Notes: