General Retzian-(Nd) Information
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Chemical Formula: |
Mn2(Nd,Ce,La)(AsO4)(OH)4 |
Composition: |
Molecular Weight = 459.29 gm |
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Lanthanum 3.02 % La 3.55 % La2O3 |
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Cerium 9.15 % Ce 10.72 % Ce2O3 |
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Manganese 23.92 % Mn 30.89 % MnO |
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Arsenic 16.31 % As 25.02 % As2O5 |
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Hydrogen 0.88 % H 7.84 % H2O |
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Neodymium 18.84 % Nd 21.98 % Nd2O3 |
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Oxygen 27.87 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Mn2+2Nd0.6Ce0.3La0.1(AsO4)(OH)4 |
IMA Status: |
Approved IMA 1982 |
Locality: |
Link to MinDat.org Location Data. |
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Retzian-(Nd) Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 2.726(1), 3.534(0.6), 4.89(0.3), |
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Physical Properties of Retzian-(Nd)
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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 |
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Optical Properties of Retzian-(Nd)
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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. |
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Calculated Properties of Retzian-(Nd)
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Electron Density: |
relectron=4.07 gm/cc note: rRetzian-(Nd) =4.45 gm/cc. |
Fermion Index |
Fermion Index = 0.03875 Boson Index = 0.96125 |
Photoelectric: |
PERetzian-(Nd) = 186.37 barns/electron U=PERetzian-(Nd) x relectron= 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)
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Retzian-(Nd) Classification
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Dana Class: |
41.3.4.2 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen |
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(41.3)where (A B)3 (XO4) Zq |
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(41.3.4)Dana Group |
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41.3.4.1 Retzian-(Ce) Mn2Ce(AsO4)(OH)4 Pban 2/m 2/m 2/m |
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41.3.4.2 Retzian-(Nd) Mn2(Nd,Ce,La)(AsO4)(OH)4 Pban 2/m 2/m 2/m |
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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 |
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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 |
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VII/B.15 - Pseudomalachite group, Flinkite - Allactite series |
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VII/B.15-10 Flinkite Mn2Mn(AsO4)(OH)4 P nma 2/m 2/m 2/m |
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VII/B.15-20 Retzian-(La) (Mn,Mg)2(La,Ce,Nd)(AsO4)(OH)4 Pban 2/m 2/m 2/m |
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VII/B.15-30 Retzian-(Ce) Mn2Ce(AsO4)(OH)4 Pban 2/m 2/m 2/m |
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VII/B.15-40 Retzian-(Nd) Mn2(Nd,Ce,La)(AsO4)(OH)4 Pban 2/m 2/m 2/m |
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VII/B.15-45 Raadeite! Mg7(PO4)2(OH)8 P 21/n 2/m |
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VII/B.15-50 Allactite Mn7(AsO4)2(OH)8 P 21/a 2/m |
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Other Retzian-(Nd) Information
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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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Print or Cut-and-Paste your Retzian-(Nd) Specimen Label here :
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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:
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