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.

Name Pronunciation:

Churchite-(Dy) + Pronunciation

Churchite-(Dy) Crystallography

Crystal System:

Monoclinic

Physical Properties of Churchite-(Dy)

Cleavage:

{???} Perfect

Color:

Colorless, White.

Diaphaneity:

Transparent

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Churchite-(Dy)

Optical Data:

Calculated Properties of Churchite-(Dy)

Fermion Index:

Fermion Index = 0.2
Boson Index = 0.8

Photoelectric:

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

Radioactivity:

GRapi = 52,821.56 (Gamma Ray American Petroleum Institute Units)
Concentration of Churchite-(Dy) per GRapi unit = 18.93 (PPM)

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	52,821.56	17.37
100 gm	121,323	3.28E-06	5,282.16	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:

37.00.00.00 (37)Phosphate Minerals

(37.00)Without Dana Classification Numbers

(37.00.00)Phosphate, Hydrated

37.00.00.00 Arnhemite* (K,Na)2Mg2(P2O7)•5(H2O) Unk Hex

37.00.00.00 Arsenowaylandite* BiAl3(AsO4)2(OH)6 R 3m 3 2/m

37.00.00.00 Auroantimonate* AuSbO3 Ortho ? Ortho

37.00.00.00 Barium-zinc-alumopharmacosiderite* (Ba,K)0.5(Zn,Cu)0.5(Al,Fe)4(AsO4)3•5(H2O) I 42m 4 2m

37.00.00.00 Chernovite-(Ce)* (Ce,Y)(AsO4) I 4₁/amd 4/m 2/m 2/m

37.00.00.00 Churchite-(Dy)* (Dy,Sm,Gd,Nd)(PO4)•2(H2O) Mono

37.00.00.00 Gengenbachite KFe3(H2PO4)2(HPO4)4•6H2OorKFe3H8(PO4)6•6H2O P 6₃mc 6mm

37.00.00.00 IMA2008-063 Pb[Zn0.25,[]0.75]Fe3H(AsO4)2(OH)6 C 2/c 2/m

37.00.00.00 IMA2009-005 (Y,Ca,REE)5[(Si,P)O4]3F P 6₃/m 6/m 2/m 2/m

37.00.00.00 IMA2009-016 Cu4H(AsO4)2(OH)3•H2O P1 1

37.00.00.00 Kerstenite? PbSeO4(?) P nma 2/m 2/m 2/m

37.00.00.00 Krasnoselskite* CoWO4 P 2/c 2/m

37.00.00.00 Laubmannite? Fe3Fe6(PO4)4(OH)12 Unk Ortho

37.00.00.00 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4•6(H2O) Mono

37.00.00.00 Parwanite (Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7•30H2O P 2, Pm, P 2/m, P 2₁, Mono

37.00.00.00 Pyrocoproite* (Mg(K,Na))2P2O7 Unk Mono

37.00.00.00 Pyrophosphite* K2CaP2O7 P 2₁/n 2/m

37.00.00.00 Zinclavendulan? NaCa(Zn,Cu)5(AsO4)4Cl•4-5(H2O) Unk Ortho

Strunz Class:

08.CJ.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CJ -With only large cations

08.CJ.50 Ardealite Ca2(SO4)(HPO4)•4(H2O) Cc m

08.CJ.50 Brushite CaHPO4•2(H2O) I2/a 2/m

08.CJ.50 Churchite-(Dy)* (Dy,Sm,Gd,Nd)(PO4)•2(H2O) Mono

08.CJ.50 Churchite-(Nd)! Nd(PO4)•2(H2O) Mono

08.CJ.50 Churchite-(Y) YPO4•2(H2O) A2/a,Aa Mono

08.CJ.50 Pharmacolite CaHAsO4•2(H2O) Ia m

Other Churchite-(Dy) Information

See Also:

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

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Print or Cut-and-Paste your Churchite-(Dy) Specimen Label here :

Churchite-(Dy)

(Dy,Sm,Gd,Nd)(PO4)•2(H2O)
Dana No: 37.00.00.00 Strunz No: 08.CJ.50
Locality:

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