Retzian-(Nd) Mineral Data

Retzian-(Nd) Mineral Data +

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General Retzian-(Nd) Information

Chemical Formula:

Mn2(Nd,Ce,La)(AsO4)(OH)4

Composition:

Molecular Weight = 459.29 gm

Lanthanum 3.02 % La 3.55 % La₂O₃

Cerium 9.15 % Ce 10.72 % Ce₂O₃

Manganese 23.92 % Mn 30.89 % MnO

Arsenic 16.31 % As 25.02 % As₂O₅

Hydrogen 0.88 % H 7.84 % H₂O

Neodymium 18.84 % Nd 21.98 % Nd₂O₃

Oxygen 27.87 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₂Nd_0.6Ce_0.3La_0.1(AsO₄)(OH)₄

IMA Status:

Approved IMA 1982

Locality:

Link to MinDat.org Location Data.

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Retzian-(Nd) Crystallography

Axial Ratios:

a:b:c =0.4724:1:0.4025

Cell Dimensions:

a = 5.726, b = 12.12, c = 4.879, Z = 2; V = 338.60 Den(Calc)= 4.50

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): 2.726(1), 3.534(0.6), 4.89(0.3),

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Physical Properties of Retzian-(Nd)

Cleavage:

None

Color:

Pink brown, Reddish brown.

Density:

4.45

Diaphaniety:

Subtranslucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous - Dull

Streak:

light brown

Optical Properties of Retzian-(Nd)

Gladstone-Dale:

CI meas= 0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1721,KPDmeas= 0.1741,KC= 0.1789

Optical Data:

Biaxial (+), a=1.744, b=1.782, g=1.798, bire=0.0540, 2V(Calc)=64, 2V(Meas)=69.

Calculated Properties of Retzian-(Nd)

Electron Density:

r_electron=4.07 gm/cc
note: r_Retzian-(Nd)=4.45 gm/cc.

Fermion Index

Fermion Index = 0.03875
Boson Index = 0.96125

Photoelectric:

PE_Retzian-(Nd)= 186.37 barns/electron
U=PE_Retzian-(Nd) x r_electron= 758.74 barns/cc.

Radioactivity:

GRapi = 30,270.81 (Gamma Ray American Petroleum Institute Units)

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

**Estimated Radioactivity from Retzian-(Nd)** - 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 / 7.54 cm	694,829	1.88E-05	30,270.81	9.95
100 gm / 3.50 cm	69,483	1.88E-06	3,027.08	1.00
10 gm / 1.63 cm	6,948	1.88E-07	302.71	0.10
1 gm / 7.54 mm	695	1.88E-08	30.27	0.01
0.1 gm / 3.50 mm	69	1.88E-09	3.03	0.00
0.01 gm / 1.63 mm	7	1.88E-10	0.30	0.00
0.001 gm / 0.75 mm	1	1.88E-11	0.03	0.00

Weight of pure Retzian-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.45 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 ( 1.55 % Th) From Sum REE Elements (31.02 % REE)

Retzian-(Nd) Classification

Dana Class:

41.3.4.2 (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.15-40 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-(Nd) 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-(Nd) :
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-(Nd)

Mn2(Nd,Ce,La)(AsO4)(OH)4
Dana No: 41.3.4.2 Strunz No: VII/B.15-40
Locality:

Notes: