Remondite-(La) Mineral Data

General Remondite-(La) Information

Chemical Formula:

Na3(La,Ce,Ca)3(CO3)5

Composition:

Molecular Weight = 624.98 gm

Sodium 12.25 % Na 16.51 % Na₂O

Strontium 2.80 % Sr 3.32 % SrO

Calcium 3.91 % Ca 5.47 % CaO

Lanthanum 17.78 % La 20.85 % La₂O₃

Cerium 15.25 % Ce 17.86 % Ce₂O₃

Carbon 9.61 % C 35.21 % CO₂

Oxygen 38.40 % O

______ ______

100.00 % 99.22 % = TOTAL OXIDE

Empirical Formula:

Na_3.33La_0.8Ce_0.68Ca_0.61Sr_0.2(CO₃)₅

Environment:

Late-stage hydrothermal mineral in a hyperagpaitic pegmatite. La-analogue of remondite-(Ce), burbankite group.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Koashva Mountain, Khibiny massif, Kola Penninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the La analog of remondite-(Ce).

Name Pronunciation:

Remondite-(La) + Pronunciation

Synonym:

IMA1999-006

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Remondite-(La) Crystallography

Axial Ratios:

a:b:c =1.6347:1:1.6362

Cell Dimensions:

a = 10.49, b = 6.417, c = 10.5, Z = 2; beta = 119.8° V = 613.34 Den(Calc)= 3.38

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 2.623(1)(204,022,402,223.036(0.9)(112,211,311), 2.143(0.8)(014,410), 3.7(0.7)(012), 1.939(0.6)(032,230), 2.041(0.6)(222), 5.28(0.5)(101,011,301,11

Physical Properties of Remondite-(La)

Cleavage:

None

Color:

Bright orange yellow.

Density:

3.5

Diaphaneity:

Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

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

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Remondite-(La)

Gladstone-Dale:

CI meas= 0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.183,KPDmeas= 0.1768,KC= 0.1785
Ncalc = 1.6 - 1.62

Optical Data:

Biaxial (-), a=1.615, b=1.619, g=1.622, bire=0.0070

Calculated Properties of Remondite-(La)

Electron Density:

Bulk Density (Electron Density)=3.26 gm/cc
note: Specific Gravity of Remondite-(La) =3.50 gm/cc.

Fermion Index:

Fermion Index = 0.0034169256
Boson Index = 0.9965830744

Photoelectric:

PE_{Remondite-(La)}= 161.43 barns/electron
U=PE_{Remondite-(La)} x r_electron= 527.00 barns/cc.

Radioactivity:

GRapi = 32,857.98 (Gamma Ray American Petroleum Institute Units)
Concentration of Remondite-(La) per GRapi unit = 30.43 (PPM)

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

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 925.70 ±231.43 grams of pure Remondite-(La) .

**Estimated Radioactivity from Remondite-(La)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.17 cm	739,775	2.00E-05	32,857.98	10.80
100 gm / 3.79 cm	73,978	2.00E-06	3,285.80	1.08
10 gm / 1.76 cm	7,398	2.00E-07	328.58	0.11
1 gm / 8.17 mm	740	2.00E-08	32.86	0.01
0.1 gm / 3.79 mm	74	2.00E-09	3.29	0.00
0.01 gm / 1.76 mm	7	2.00E-10	0.33	0.00
0.001 gm / 0.82 mm	1	2.00E-11	0.03	0.00

Weight of pure Remondite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.50 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 ( 1.65 % Th) From Sum REE Elements (33.03 % REE)

Remondite-(La) Classification

Dana Class:

14.04.05.03 (14)Anhydrous Carbonates

(14.04)with Compound Formula A+2 B++2 (CO3)4

(14.04.05)Burbankite Group (Monoclinic)

14.04.05.01 Remondite-(Ce) Na3(Ce,La,Ca,Na,Sr)3(CO3)5 P 2₁ 2

14.04.05.02 Petersenite-(Ce) (Na,Ca)4(Ce,La,Nd)2(CO3)5 P 2₁ 2

14.04.05.03 Remondite-(La)! Na3(La,Ce,Ca)3(CO3)5 P 2₁ 2

Strunz Class:

05.AD.15 05 - CARBONATES (NITRATES)

05.A - Carbonates without additional anions, without H2O

05.AD -With rare-earth elements (REE)

05.AD.15 Remondite-(Ce) Na3(Ce,La,Ca,Na,Sr)3(CO3)5 P 2₁ 2

05.AD.15 Petersenite-(Ce) (Na,Ca)4(Ce,La,Nd)2(CO3)5 P 2₁ 2

05.AD.15 Remondite-(La)! Na3(La,Ce,Ca)3(CO3)5 P 2₁ 2

Other Remondite-(La) Information

References:

NAME( AmMin, v 86, p 377) PHYS. PROP.(AmMin, v 86, p 377) OPTIC PROP.(AmMin, v 86, p 377)

See Also:

Links to other databases for Remondite-(La) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Remondite-(La) Specimen Label here :

Remondite-(La)

Na3(La,Ce,Ca)3(CO3)5
Dana No: 14.04.05.03 Strunz No: 05.AD.15
Locality:

Notes: