Monazite-(La) Mineral Data (original) (raw)

General Monazite-(La) Information

Help on Chemical Formula: Chemical Formula:

(La,Ce,Nd)PO4

Help on Composition: Composition:

Molecular Weight = 239.90 gm

Lanthanum 28.95 % La 33.95 % La2O3

Cerium 14.60 % Ce 17.10 % Ce2O3

Thorium 4.84 % Th 5.50 % ThO2

Phosphorus 12.91 % P 29.58 % P2O5

Neodymium 12.02 % Nd 14.03 % Nd2O3

Oxygen 26.68 % O

______ ______

100.00 % 100.17 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

La0.5Ce0.25Nd0.2Th0.05(PO4)

Help on Environment: Environment:

Granitic pegmatites.

Help on IMA Status: IMA Status:

Approved IMA 1966

Help on Locality: Locality:

Mars Hill, Madison County, North Carolina. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

From the Greek monazeis - "to be alone" in allusion to its isolated crystals and their rarity when first found.

Help on Name Pronunciation: Name Pronunciation:

Monazite-(La) Say MONAZITE-(LA)

Help on Synonym: Synonym:

ICSD 79747

PDF 46-1326

Monazite-(La) Image

Click Here for Larger Monazite-(La) Image in a New Browser Window Images:

Click Here for Larger Monazite-(La) Image Monazite-(La) Comments: Yellowish crystals of monazite-(La) in a cavity in nephelin-syenite pegmatite. Location: Kuivchorr Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.Scale: FOV is 9x7 mm. © Pavel M. Kartashov

Monazite-(La) Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.9686:1:0.9215

Help on Cell Dimensions: Cell Dimensions:

a = 6.79, b = 7.01, c = 6.46, Z = 4; beta = 103.633° V = 298.82 Den(Calc)= 5.33

Help on Crystal System: Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/n

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 3.12(1), 3.31(0.85), 2.15(0.4),

Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
- Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

| | Forms:( 0 1 0) ( 1 1 1) ( 1 0 1) ( 1 1 0) ( 1 0 0) ( 1 0 1) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |

Click Here for Large Monazite-(La) Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

| | Ni Y , Hughes J M , Mariano A N , American Mineralogist , 80 (1995) p.21-26, Crystal chemistry of the monazite and xenotime structures, La(PO4) | | -------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Monazite-(La)

Help on Cleavage: Cleavage:

{001} Distinct, {100} Indistinct

Help on Color: Color:

Brown, Brown, Yellowish brown, Pink, Yellow.

Help on Density: Density:

4.8 - 5.5, Average = 5.15

Help on Diaphaneity: Diaphaneity:

Transparent to Subtranslucent

Help on Fracture: Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Help on Habit: Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Help on Habit: Habit:

Twinning Common - Crystals are usually twinned.

Help on Hardness: Hardness:

5-5.5 - Apatite-Knife Blade

Help on Luster: Luster:

Adamantine - Resinous

Help on Streak: Streak:

grayish white

Optical Properties of Monazite-(La)

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1508,KPDmeas= 0.1561,KC= 0.1574
Ncalc = 1.76 - 1.87

Help on Optical Data: Optical Data:

Biaxial (+), a=1.77-1.8, b=1.7705-1.802, g=1.83-1.85, bire=0.0500-0.0600, 2V(Calc)=12-24, 2V(Meas)=12.

Calculated Properties of Monazite-(La)

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=4.57 gm/cc
note: Specific Gravity of Monazite-(La) =5.15 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Help on Photoelectric: Photoelectric:

PEMonazite-(La) = 402.34 barns/electron
U=PEMonazite-(La) x relectron=1,839.70 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 91,600.36 (Gamma Ray American Petroleum Institute Units)
Concentration of Monazite-(La) per GRapi unit = 10.92 (PPM)

Monazite-(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) 332.06 ± 83.01 grams of pure Monazite-(La) .

Estimated Radioactivity from Monazite-(La) - weak

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor One Hour
1000 gm / 7.18 cm 2,166,567 5.86E-05 91,600.36 30.12
100 gm / 3.33 cm 216,657 5.86E-06 9,160.04 3.01
10 gm / 1.55 cm 21,666 5.86E-07 916.00 0.30
1 gm / 7.18 mm 2,167 5.86E-08 91.60 0.03
0.1 gm / 3.33 mm 217 5.86E-09 9.16 0.00
0.01 gm / 1.55 mm 22 5.86E-10 0.92 0.00
0.001 gm / 0.72 mm 2 5.86E-11 0.09 0.00

Weight of pure Monazite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.15 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

Monazite-(La) Classification

Help on Dana Class: Dana Class:

38.04.03.02 (38)Anhydrous Phosphates, etc

(38.04)A+ XO4

(38.04.03)Monazite Group (Monoclinic: P21/n)

38.04.03.01 Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 21/n 2/m

38.04.03.02 Monazite-(La) (La,Ce,Nd)PO4 P 21/n 2/m

38.04.03.03 Cheralite-(Ce)? (Ce,Ca,Th)(P,Si)O4 P 21/n 2/m

38.04.03.04 Brabantite? CaTh(PO4)2 P 21 2

38.04.03.05 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 21/n 2/m

38.04.03.06 Gasparite-(Ce) CeAsO4 P 21/n 2/m

38.04.03.07 Monazite-(Sm)! SmPO4 P 21/n 2/m

Help on Strunz Class: Strunz Class:

08.AD.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AD -With only large cations

08.AD.50 Brabantite? CaTh(PO4)2 P 21 2

08.AD.50 Gasparite-(Ce) CeAsO4 P 21/n 2/m

08.AD.50 Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 21/n 2/m

08.AD.50 Monazite-(La) (La,Ce,Nd)PO4 P 21/n 2/m

08.AD.50 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 21/n 2/m

08.AD.50 Rooseveltite BiAsO4 P 2/m 2/m

08.AD.50 Monazite-(Sm)! SmPO4 P 21/n 2/m

Other Monazite-(La) Information

Help on References: References:

NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)

Help on See Also: See Also:

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

Search for Monazite-(La) using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Monazite-(La) :

A Bijoux Google Search for Monazite-(La)
Adam's Minerals Google Search for Monazite-(La)
Cape Minerals Google Search for Monazite-(La)
Dakota Matrix Minerals Google Search for Monazite-(La)
Excalibur Mineral Corp. Google Search for Monazite-(La)
Exceptional Minerals Google Search for Monazite-(La)
John Betts Fine Minerals Search for Monazite-(La)
McDougall Minerals Google Search for Monazite-(La)
Mineral News Website Link
Rock and Mineral Shows Google Search for Monazite-(La)
Weinrich Minerals, Inc. Google Search for Monazite-(La)

Ask about Monazite-(La) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

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

Monazite-(La)

(La,Ce,Nd)PO4
Dana No: 38.04.03.02 Strunz No: 08.AD.50
Locality:

Notes: