Retzian-(La) Mineral Data

Retzian-(La) Mineral Data +

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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

IMA Status:

Approved IMA 1982

Locality:

Link to MinDat.org Location Data.

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Retzian-(La) Crystallography

Axial Ratios:

a:b:c =0.4721:1:0.4054

Cell Dimensions:

a = 5.67, b = 12.01, c = 4.869, Z = 2; V = 331.56 Den(Calc)= 4.42

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pban

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

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

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Physical Properties of Retzian-(La)

Cleavage:

None

Color:

Reddish brown.

Density:

4.49

Diaphaniety:

Subtranslucent

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

brownish white

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

Optical Data:

Biaxial (+), a=1.766, b=1.773, g=1.788, bire=0.0220, 2V(Calc)=70, 2V(Meas)=82.

Calculated Properties of Retzian-(La)

Electron Density:

r_electron=4.05 gm/cc
note: r_Retzian-(La)=4.42 gm/cc.

Fermion Index

Fermion Index = 0.00975
Boson Index = 0.99025

Photoelectric:

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

Radioactivity:

GRapi = 30,949.22 (Gamma Ray American Petroleum Institute Units)

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	709,605	1.92E-05	30,949.22	10.18
100 gm / 3.51 cm	70,961	1.92E-06	3,094.92	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:

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

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

(41.3.4)Dana Group

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

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

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

Strunz Class:

VII/B.15-20 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.15 - Pseudomalachite group, Flinkite - Allactite series

VII/B.15-10 Flinkite Mn2Mn(AsO4)(OH)4 P nma 2/m 2/m 2/m

VII/B.15-20 Retzian-(La) (Mn,Mg)2(La,Ce,Nd)(AsO4)(OH)4 Pban 2/m 2/m 2/m

VII/B.15-30 Retzian-(Ce) Mn2Ce(AsO4)(OH)4 Pban 2/m 2/m 2/m

VII/B.15-40 Retzian-(Nd) Mn2(Nd,Ce,La)(AsO4)(OH)4 Pban 2/m 2/m 2/m

VII/B.15-45 Raadeite! Mg7(PO4)2(OH)8 P 2₁/n 2/m

VII/B.15-50 Allactite Mn7(AsO4)2(OH)8 P 2₁/a 2/m

Other Retzian-(La) Information

References:

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

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 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Retzian-(La)

(Mn,Mg)2(La,Ce,Nd)(AsO4)(OH)4
Dana No: 41.3.4.3 Strunz No: VII/B.15-20
Locality:

Notes: