General Churchite-(Nd) Information
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Chemical Formula: |
Nd(PO4)·2(H2O) |
Composition: |
Molecular Weight = 275.24 gm |
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Phosphorus 11.25 % P 25.79 % P2O5 |
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Hydrogen 1.46 % H 13.09 % H2O |
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Neodymium 52.40 % Nd 61.12 % Nd2O3 |
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Oxygen 34.88 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Nd(PO4)·2(H2O) |
Environment: |
Proposed analogue of churchite with Nd as the dominant cation. |
IMA Status: |
Not Approved IMA (Dana # Added) |
Locality: |
Link to MinDat.org Location Data. |
Name Origin: |
Named for Arthur Hubert Church (1834-1915, English chemist who described and analyzed the mineral. |
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Search for Churchite-(Nd) Images |
Images:
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Churchite-(Nd) Crystallography
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Crystal System: |
Monoclinic |
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Physical Properties of Churchite-(Nd)
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Cleavage: |
[???] Perfect |
Color: |
Yellowish white, Pink white. |
Diaphaniety: |
Transparent |
Hardness: |
3-3.5 - Calcite-Copper Penny |
Luster: |
Vitreous - Pearly |
Streak: |
white |
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Calculated Properties of Churchite-(Nd)
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Fermion Index |
Fermion Index = 0.10749 Boson Index = 0.89251 |
Photoelectric: |
PEChurchite-(Nd) = 298.27 barns/electron U=PEChurchite-(Nd) x relectron= . barns/cc. |
Radioactivity: |
GRapi = 51,584.47 (Gamma Ray American Petroleum Institute Units)
Churchite-(Nd) 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)
589.65 ±147.41 grams of pure Churchite-(Nd) .
Estimated Radioactivity from Churchite-(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 |
1,173,868 |
3.17E-05 |
51,584.47 |
16.96 |
| 100 gm |
117,387 |
3.17E-06 |
5,158.45 |
1.70 |
| 10 gm |
11,739 |
3.17E-07 |
515.84 |
0.17 |
| 1 gm |
1,174 |
3.17E-08 |
51.58 |
0.02 |
| 0.1 gm |
117 |
3.17E-09 |
5.16 |
0.00 |
| 0.01 gm |
12 |
3.17E-10 |
0.52 |
0.00 |
| 0.001 gm |
1 |
3.17E-11 |
0.05 |
0.00 |
Weight of pure Churchite-(Nd) in grams (gm).*
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 ( 2.62 % Th) From Sum REE Elements (52.40 % REE)
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Churchite-(Nd) Classification
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Dana Class: |
40.4.6.2 (40)Hydrated Phosphates, etc |
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(40.4)where A+++ XO4 · x(H2O) |
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(40.4.6)Dana Group |
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40.4.6.1 Churchite-(Y) YPO4·2(H2O) A2/a,Aa Mono |
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40.4.6.2 Churchite-(Nd) ! Nd(PO4)·2(H2O) Mono |
Strunz Class: |
VII/C.25-40 VII - Phosphates, Arsenates and Vanadates |
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VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+ |
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VII/C.25 - Brushite - Churchite-(Dy) series |
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VII/C.25-10 Brushite CaHPO4·2(H2O) I2/a 2/m |
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VII/C.25-20 Pharmacolite CaHAsO4·2(H2O) Ia m |
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VII/C.25-30 Churchite-(Y) YPO4·2(H2O) A2/a,Aa Mono |
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VII/C.25-40 Churchite-(Nd) Nd(PO4)·2(H2O) Mono |
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VII/C.25-50 Churchite-(Dy)* (Dy,Sm,Gd,Nd)(PO4)·2(H2O) Mono |
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Other Churchite-(Nd) Information
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See Also: |
Links to other databases for Churchite-(Nd) :
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
11 -École des Mines de Paris
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Print or Cut-and-Paste your Churchite-(Nd) Specimen Label here :
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Churchite-(Nd)
Nd(PO4)·2(H2O)
Dana No: 40.4.6.2 Strunz No: VII/C.25-40
Locality:
Notes:
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