Retzian-(Ce) Mineral Data

Retzian-(Ce) Mineral Data +

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General Retzian-(Ce) Information

Chemical Formula:

Mn2Ce(AsO4)(OH)4

Composition:

Molecular Weight = 456.94 gm

Cerium 30.66 % Ce 35.92 % Ce₂O₃

Manganese 24.05 % Mn 31.05 % MnO

Arsenic 16.40 % As 25.15 % As₂O₅

Hydrogen 0.88 % H 7.89 % H₂O

Oxygen 28.01 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₂Ce(AsO₄)(OH)₄

IMA Status:

Valid Species (Pre-IMA) 1894

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 16903

PDF 20-731

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Retzian-(Ce) Crystallography

Axial Ratios:

a:b:c =0.4713:1:0.4042

Cell Dimensions:

a = 5.67, b = 12.03, c = 4.863, Z = 2; V = 331.71 Den(Calc)= 4.57

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): 2.717(1), 3.553(0.8), 1.848(0.5),

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Physical Properties of Retzian-(Ce)

Cleavage:

None

Color:

Dark brown.

Density:

4.15

Diaphaniety:

Subtranslucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Hardness:

4 - Fluorite

Luster:

Vitreous - Greasy

Streak:

light brown

Optical Properties of Retzian-(Ce)

Gladstone-Dale:

CI meas= -0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1725,KPDmeas= 0.19,KC= 0.1804

Optical Data:

Biaxial (+), a=1.777, b=1.788, g=1.8, bire=0.0230

Calculated Properties of Retzian-(Ce)

Electron Density:

r_electron=4.18 gm/cc
note: r_Retzian-(Ce)=4.57 gm/cc.

Fermion Index

Fermion Index = 0.00013
Boson Index = 0.99987

Photoelectric:

PE_Retzian-(Ce)= 172.87 barns/electron
U=PE_Retzian-(Ce) x r_electron= 722.69 barns/cc.

Radioactivity:

GRapi = 29,920.71 (Gamma Ray American Petroleum Institute Units)

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

**Estimated Radioactivity from Retzian-(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 / 7.48 cm	686,869	1.86E-05	29,920.71	9.84
100 gm / 3.47 cm	68,687	1.86E-06	2,992.07	0.98
10 gm / 1.61 cm	6,869	1.86E-07	299.21	0.10
1 gm / 7.48 mm	687	1.86E-08	29.92	0.01
0.1 gm / 3.47 mm	69	1.86E-09	2.99	0.00
0.01 gm / 1.61 mm	7	1.86E-10	0.30	0.00
0.001 gm / 0.75 mm	1	1.86E-11	0.03	0.00

Weight of pure Retzian-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.57 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 ( 1.53 % Th) From Sum REE Elements (30.66 % REE)

Retzian-(Ce) Classification

Dana Class:

41.3.4.1 (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.15-30 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-(Ce) 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-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Retzian-(Ce)

Mn2Ce(AsO4)(OH)4
Dana No: 41.3.4.1 Strunz No: VII/B.15-30
Locality:

Notes: