Churchite-(Dy) Mineral Data

Churchite-(Dy) Mineral Data +

General Churchite-(Dy) Information

Chemical Formula:

(Dy,Sm,Gd,Nd)(PO4)·2(H2O)

Composition:

Molecular Weight = 283.93 gm

Samarium 5.30 % Sm 6.14 % Sm₂O₃

Gadolinium 11.08 % Gd 12.77 % Gd₂O₃

Dysprosium 17.17 % Dy 19.71 % Dy₂O₃

Phosphorus 10.91 % P 25.00 % P₂O₅

Hydrogen 1.42 % H 12.69 % H₂O

Neodymium 20.32 % Nd 23.70 % Nd₂O₃

Oxygen 33.81 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Dy_0.3Sm_0.1Gd_0.2Nd_0.4(PO₄)·2(H₂O)

IMA Status:

Not Approved IMA

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named for Arthur Hubert Church (1834-19150, English chemist who described and analyzed the mineral and the element dysprosium.

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Churchite-(Dy) Crystallography

Crystal System:

Monoclinic

Physical Properties of Churchite-(Dy)

Cleavage:

[???] Perfect

Color:

Colorless, White.

Diaphaniety:

Transparent

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Calculated Properties of Churchite-(Dy)

Fermion Index

Fermion Index = 0.20904
Boson Index = 0.79096

Photoelectric:

PE_{Churchite-(Dy)}= 364.78 barns/electron
U=PE_{Churchite-(Dy)} x r_electron= . barns/cc.

Radioactivity:

GRapi = 52,821.55 (Gamma Ray American Petroleum Institute Units)

Churchite-(Dy) 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) 575.84 ±143.96 grams of pure Churchite-(Dy) .

**Estimated Radioactivity from Churchite-(Dy)** - 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	1,213,230	3.28E-05	52,821.55	17.37
100 gm	121,323	3.28E-06	5,282.15	1.74
10 gm	12,132	3.28E-07	528.22	0.17
1 gm	1,213	3.28E-08	52.82	0.02
0.1 gm	121	3.28E-09	5.28	0.00
0.01 gm	12	3.28E-10	0.53	0.00
0.001 gm	1	3.28E-11	0.05	0.00

Weight of pure Churchite-(Dy) 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 ( 2.69 % Th) From Sum REE Elements (53.86 % REE)

Churchite-(Dy) Classification

Dana Class:

37.0.0.0 (37)Phosphate Minerals

(37.0)Without Dana Classification Numbers

(Phosphate, Hydrated)

Strunz Class:

VII/C.25-50 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.25 - Brushite - Churchite-(Dy) series

VII/C.25-10 Brushite CaHPO4·2(H2O) I2/a 2/m

VII/C.25-20 Pharmacolite CaHAsO4·2(H2O) Ia m

VII/C.25-30 Churchite-(Y) YPO4·2(H2O) A2/a,Aa Mono

VII/C.25-40 Churchite-(Nd)! Nd(PO4)·2(H2O) Mono

VII/C.25-50 Churchite-(Dy) (Dy,Sm,Gd,Nd)(PO4)·2(H2O) Mono

Other Churchite-(Dy) Information

See Also:

Links to other databases for Churchite-(Dy) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas 10 -École des Mines de Paris

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Churchite-(Dy)

(Dy,Sm,Gd,Nd)(PO4)·2(H2O)
Dana No: Unknown Strunz No: VII/C.25-50
Locality:

Notes: