Graulichite-(Ce) Mineral Data

General Graulichite-(Ce) Information

Chemical Formula:

CeFe+++3(AsO4)2(OH)6

Composition:

Molecular Weight = 680.93 gm

Barium 3.63 % Ba 4.05 % BaO

Strontium 0.26 % Sr 0.30 % SrO

Lanthanum 2.04 % La 2.39 % La₂O₃

Cerium 13.79 % Ce 16.15 % Ce₂O₃

Aluminum 1.66 % Al 3.14 % Al₂O₃

Iron 21.98 % Fe 31.43 % Fe₂O₃

Arsenic 20.80 % As 31.90 % As₂O₅

Hydrogen 0.95 % H 8.49 % H₂O

Sulfur 0.05 % S 0.11 % S₂O₅

Neodymium 1.91 % Nd 2.22 % Nd₂O₃

Oxygen 32.94 % O

______ ______

100.00 % 100.19 % = TOTAL OXIDE

Empirical Formula:

Ce_0.67Ba_0.18La_0.1Nd_0.09Sr_0.02Fe³⁺_2.68Al_0.42As_1.89S_0.01O₈(OH)_5.62(H₂O)_0.4

Environment:

Formed from weathering arsenopyrite-bearing quartzite. Fe-dominant analogue of arsenoflorencite-(Ce).

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Hourt quarry, Stavelot Massif, Belgian Ardennes. Link to MinDat.org Location Data.

Name Origin:

Named for Jean-Marie Graulich (1920-2001), Belgian mining engineer and Honorary Driector of the Geological survey of Belgium.

Synonym:

IMA2002-001

Graulichite-(Ce) Image

Images:

Graulichite-(Ce)

Comments: Scanning electron microscope image of rhombohedral graulichite-(Ce) crystals on goethite.
Location: Hourt quarry, Stavelot Massif, Belgian Ardennes. Scale: See Image.
© University de Liege

Graulichite-(Ce) Crystallography

Axial Ratios:

a:c = 1:2.30991

Cell Dimensions:

a = 7.26, c = 16.77, Z = 3; V = 765.49 Den(Calc)= 4.43

Crystal System:

Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 3.052(1)(113), 3.636(0.4)(110), 1.817(0.35)(220),2.239(0.35)(107), 2.792(0.3)(006), 5.906(0.25),

Physical Properties of Graulichite-(Ce)

Cleavage:

None

Color:

Light green, Brownish green.

Density:

3.9

Diaphaneity:

Transparent

Fracture:

Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.

Habit:

Spherical - Spherical, rounded aggregates.

Luster:

Resinous

Optical Properties of Graulichite-(Ce)

Gladstone-Dale:

CI meas= -0.123 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.219,KPDmeas= 0.2487,KC= 0.2215
Ncalc = 1.86 - 1.98

Optical Data:

Uniaxial (-), w=1.97.

Calculated Properties of Graulichite-(Ce)

Electron Density:

Bulk Density (Electron Density)=4.13 gm/cc
note: Specific Gravity of Graulichite-(Ce) =4.43 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Graulichite-(Ce)}= 125.82 barns/electron
U=PE_{Graulichite-(Ce)} x r_electron= 519.06 barns/cc.

Radioactivity:

GRapi = 17,614.43 (Gamma Ray American Petroleum Institute Units)
Concentration of Graulichite-(Ce) per GRapi unit = 56.77 (PPM)

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

**Estimated Radioactivity from Graulichite-(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 / 7.55 cm	397,220	1.07E-05	17,614.43	5.79
100 gm / 3.51 cm	39,722	1.07E-06	1,761.44	0.58
10 gm / 1.63 cm	3,972	1.07E-07	176.14	0.06
1 gm / 7.55 mm	397	1.07E-08	17.61	0.01
0.1 gm / 3.51 mm	40	1.07E-09	1.76	0.00
0.01 gm / 1.63 mm	4	1.07E-10	0.18	0.00
0.001 gm / 0.76 mm	0	1.07E-11	0.02	0.00

Weight of pure Graulichite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.43 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 ( 0.89 % Th) From Sum REE Elements (17.73 % REE)

Graulichite-(Ce) Classification

Dana Class:

41.05.11.04 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.11)Arsenoflorencite Group

41.05.11.01 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

41.05.11.02 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m

41.05.11.03 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

41.05.11.04 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m

Strunz Class:

08.BL.13 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.13 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.13 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

08.BL.13 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

08.BL.13 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m

08.BL.13 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.13 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m

Other Graulichite-(Ce) Information

References:

NAME( AmMin, 89:468) PHYS. PROP.(AmMin, 89:468) OPTIC PROP.(AmMin, 89:468)

See Also:

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

Search for Graulichite-(Ce) using:

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

Visit our Advertisers for Graulichite-(Ce) :

Ask about Graulichite-(Ce) 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 Español

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

Graulichite-(Ce)

CeFe+++3(AsO4)2(OH)6
Dana No: 41.05.11.04 Strunz No: 08.BL.13
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.