Retzian-(La) Mineral Data

General Retzian-(La) Information

Chemical Formula:

(Mn,Mg)2(La,Ce,Nd)(AsO4)(OH)4

Composition:

Molecular Weight = 441.31 gm

Lanthanum 18.89 % La 22.15 % La₂O₃

Cerium 9.52 % Ce 11.16 % Ce₂O₃

Magnesium 2.75 % Mg 4.57 % MgO

Manganese 18.67 % Mn 24.11 % MnO

Arsenic 16.98 % As 26.04 % As₂O₅

Hydrogen 0.91 % H 8.16 % H₂O

Neodymium 3.27 % Nd 3.81 % Nd₂O₃

Oxygen 29.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_1.5Mg_0.5La_0.6Ce_0.3Nd_0.1(AsO₄)(OH)₄

Environment:

Overgrowth crystals and embedded in light brown rhodochrosite in the willemite-franlinite ore.

IMA Status:

Approved IMA 1982

Locality:

Sterling Hill mine, Ogdensburg, Sussex Co., NJ, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Anders Jahan Retzius (1742-1821), Swedish naturalist.

Name Pronunciation:

Retzian-(La)

Retzian-(La) Crystallography

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

By Intensity(I/I_o): 2.715(1), 3.51(0.8), 1.84(0.5),

Forms:

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Forms: ( 0 1 0) ( 1 1 0) ( 1 0 1) ( 0 0 1)

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Physical Properties of Retzian-(La)

Color:

Reddish brown.

Optical Properties of Retzian-(La)

Gladstone-Dale:

CI meas= 0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1755,KPDmeas= 0.1728,KC= 0.1806
Ncalc = 1.8 - 1.81

Calculated Properties of Retzian-(La)

Electron Density:

Bulk Density (Electron Density)=4.05 gm/cc
note: Specific Gravity of Retzian-(La) =4.42 gm/cc.

Fermion Index:

Fermion Index = 0.0097580777
Boson Index = 0.9902419223

Photoelectric:

PE_Retzian-(La)= 172.48 barns/electron
U=PE_Retzian-(La) x r_electron= 698.26 barns/cc.

Radioactivity:

GRapi = 30,949.28 (Gamma Ray American Petroleum Institute Units)
Concentration of Retzian-(La) per GRapi unit = 32.31 (PPM)

Retzian-(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) 982.79 ±245.70 grams of pure Retzian-(La) .

**Estimated Radioactivity from Retzian-(La)** - 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 / 7.56 cm	709,606	1.92E-05	30,949.28	10.18
100 gm / 3.51 cm	70,961	1.92E-06	3,094.93	1.02
10 gm / 1.63 cm	7,096	1.92E-07	309.49	0.10
1 gm / 7.56 mm	710	1.92E-08	30.95	0.01
0.1 gm / 3.51 mm	71	1.92E-09	3.09	0.00
0.01 gm / 1.63 mm	7	1.92E-10	0.31	0.00
0.001 gm / 0.76 mm	1	1.92E-11	0.03	0.00

Weight of pure Retzian-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.42 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 ( 1.58 % Th) From Sum REE Elements (31.68 % REE)

Retzian-(La) Classification

Dana Class:

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

(41.03)where (A B)3 (XO4) Zq

(41.03.04)Retzian Series

41.03.04.01 Retzian-(Ce) Mn2Ce(AsO4)(OH)4 Pban 2/m 2/m 2/m

41.03.04.02 Retzian-(Nd) Mn2(Nd,Ce,La)(AsO4)(OH)4 Pban 2/m 2/m 2/m

41.03.04.03 Retzian-(La) (Mn,Mg)2(La,Ce,Nd)(AsO4)(OH)4 Pban 2/m 2/m 2/m

Strunz Class:

08.BM.05 08 - PHOSPHATES, ARSENATES, VANADATES

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

08.BM -With medium-sized and large cations, (OH, etc.):RO4 = 4:1

08.BM.05 Retzian-(Ce) Mn2Ce(AsO4)(OH)4 Pban 2/m 2/m 2/m

08.BM.05 Retzian-(La) (Mn,Mg)2(La,Ce,Nd)(AsO4)(OH)4 Pban 2/m 2/m 2/m

08.BM.05 Retzian-(Nd) Mn2(Nd,Ce,La)(AsO4)(OH)4 Pban 2/m 2/m 2/m

Other Retzian-(La) Information

See Also:

Links to other databases for Retzian-(La) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Franklin Minerals(Dunn)
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 Retzian-(La) Specimen Label here :

Retzian-(La)

(Mn,Mg)2(La,Ce,Nd)(AsO4)(OH)4
Dana No: 41.03.04.03 Strunz No: 08.BM.05
Locality:

Notes:

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