Mineralogy Database

Churchite-(Dy) Mineral Data

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General Churchite-(Dy) Information

Help on Chemical  Formula: Chemical Formula: (Dy,Sm,Gd,Nd)(PO4)•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Dy0.3Sm0.1Gd0.2Nd0.4(PO4)•2(H2O)
Help on IMA Status: IMA Status: Not Approved IMA
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Arthur Hubert Church (1834-19150, English chemist who described and analyzed the mineral and the element dysprosium.
Help on Name Pronunciation: Name Pronunciation: Churchite-(Dy) + Pronunciation Say CHURCHITE-(DY)

Churchite-(Dy) Crystallography

Help on Crystal System: Crystal System: Monoclinic

Physical Properties of Churchite-(Dy)

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless, White.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Churchite-(Dy)

Help on Optical Data: Optical Data:

Calculated Properties of Churchite-(Dy)

Help on Fermion Index: Fermion Index: Fermion Index = 0.2
Boson Index = 0.8
Help on Photoelectric: Photoelectric: PEChurchite-(Dy) = 364.78 barns/electron
U=PEChurchite-(Dy) x relectron= . barns/cc.
Help on Radioactivity: 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
Curies (Ci)
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

Help on  Dana Class: Dana Class: (37)Phosphate Minerals
  (37.00)Without Dana Classification Numbers
  (37.00.00)Phosphate, Hydrated Arnhemite* (K,Na)2Mg2(P2O7)•5(H2O) Unk Hex Arsenowaylandite* BiAl3(AsO4)2(OH)6 R 3m 3 2/m Auroantimonate* AuSbO3 Ortho ? Ortho Barium-zinc-alumopharmacosiderite* (Ba,K)0.5(Zn,Cu)0.5(Al,Fe)4(AsO4)3•5(H2O) I 42m 4 2m Chernovite-(Ce)* (Ce,Y)(AsO4) I 41/amd 4/m 2/m 2/m Churchite-(Dy)* (Dy,Sm,Gd,Nd)(PO4)•2(H2O) Mono Gengenbachite KFe3(H2PO4)2(HPO4)4•6H2OorKFe3H8(PO4)6•6H2O P 63mc 6mm IMA2008-063 Pb[Zn0.25,[]0.75]Fe3H(AsO4)2(OH)6 C 2/c 2/m IMA2009-005 (Y,Ca,REE)5[(Si,P)O4]3F P 63/m 6/m 2/m 2/m IMA2009-016 Cu4H(AsO4)2(OH)3•H2O P1 1 Kerstenite? PbSeO4(?) P nma 2/m 2/m 2/m Krasnoselskite* CoWO4 P 2/c 2/m Laubmannite? Fe3Fe6(PO4)4(OH)12 Unk Ortho Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4•6(H2O) Mono Parwanite (Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7•30H2O P 2, Pm, P 2/m, P 21, Mono Pyrocoproite* (Mg(K,Na))2P2O7 Unk Mono Pyrophosphite* K2CaP2O7 P 21/n 2/m Zinclavendulan? NaCa(Zn,Cu)5(AsO4)4Cl•4-5(H2O) Unk Ortho
Help on  Strunz Class: 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

Help on See Also: 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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Dana No: Strunz No: 08.CJ.50





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