Laplandite-(Ce) Mineral Data

General Laplandite-(Ce) Information

Chemical Formula:

Na4CeTiPSi7O22•5(H2O)

Composition:

Molecular Weight = 949.59 gm

Sodium 9.68 % Na 13.05 % Na₂O

Cerium 14.76 % Ce 17.28 % Ce₂O₃

Titanium 5.04 % Ti 8.41 % TiO₂

Silicon 20.70 % Si 44.29 % SiO₂

Phosphorus 3.26 % P 7.47 % P₂O₅

Hydrogen 1.06 % H 9.49 % H₂O

Oxygen 45.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₄CeTiPSi₇O₂₂•5(H₂O)

Environment:

In the natrolite zone of a pegmatite in a differentiated alkalic massif.

IMA Status:

Approved IMA 1987

Locality:

Yubileinaya pegmatite, Karnasurt Mt, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Lappland (Lapland), the region in which the Kola Peninsula lies.

Name Pronunciation:

Laplandite-(Ce) + Pronunciation

Laplandite-(Ce) Image

Images:

Laplandite-(Ce)

Comments: Grayish-white radial aggregates of laplandite-(Ce).
Location: Yubileinaya pegmatite, Karnasurt Mt, Lovozero Massif, Kola Peninsula, Russia. Scale: Picture Size 3 mm.
© Diederik Visser

Laplandite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.5055:1:1.5472

Cell Dimensions:

a = 7.27, b = 14.38, c = 22.25, Z = 4; V = 2,326.07 Den(Calc)= 2.71

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P mmm

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

By Intensity(I/I_o): 3.03(1), 7.27(1), 3.76(1),3.35(1), 2.8(0.8), 3.36(0.8), 6.47(0.7),

Physical Properties of Laplandite-(Ce)

Cleavage:

None

Color:

Bluish gray, Yellow gray, Light gray.

Density:

2.83

Diaphaneity:

Transparent to Translucent

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Laplandite-(Ce)

Gladstone-Dale:

CI meas= 0.073 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2137,KPDmeas= 0.2046,KC= 0.2208
Ncalc = 1.6 - 1.62

Optical Data:

Biaxial (-), a=1.568, b=1.584, g=1.585, bire=0.0170, 2V(Calc)=26, 2V(Meas)=28.

Calculated Properties of Laplandite-(Ce)

Electron Density:

Bulk Density (Electron Density)=2.64 gm/cc
note: Specific Gravity of Laplandite-(Ce) =2.71 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Laplandite-(Ce)}= 71.84 barns/electron
U=PE_{Laplandite-(Ce)} x r_electron= 189.85 barns/cc.

Radioactivity:

GRapi = 15,348.02 (Gamma Ray American Petroleum Institute Units)
Concentration of Laplandite-(Ce) per GRapi unit = 65.16 (PPM)

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

**Estimated Radioactivity from Laplandite-(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 / 8.90 cm	330,519	8.93E-06	15,348.02	5.05
100 gm / 4.13 cm	33,052	8.93E-07	1,534.80	0.50
10 gm / 1.92 cm	3,305	8.93E-08	153.48	0.05
1 gm / 8.90 mm	331	8.93E-09	15.35	0.01
0.1 gm / 4.13 mm	33	8.93E-10	1.53	0.00
0.01 gm / 1.92 mm	3	8.93E-11	0.15	0.00
0.001 gm / 0.89 mm	0	8.93E-12	0.02	0.00

Weight of pure Laplandite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.71 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 ( 0.74 % Th) From Sum REE Elements (14.76 % REE)

Laplandite-(Ce) Classification

Dana Class:

78.07.09.01 (78)Unclassified silicates

(78.07)wholly unclassified silicates

(78.07.09)Dana Group

78.07.09.01 Laplandite-(Ce) Na4CeTiPSi7O22•5(H2O) P mmm 2/m 2/m 2/m

Strunz Class:

09.DJ.10 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DJ -Inosilicates with 4-periodic double and triple chains

09.DJ.10 Laplandite-(Ce) Na4CeTiPSi7O22•5(H2O) P mmm 2/m 2/m 2/m

Other Laplandite-(Ce) Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Laplandite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Laplandite-(Ce)

Na4CeTiPSi7O22•5(H2O)
Dana No: 78.07.09.01 Strunz No: 09.DJ.10
Locality:

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