Churchite-(Y) Mineral Data

Churchite-(Y) Mineral Data +

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General Churchite-(Y) Information

Chemical Formula:

YPO4·2(H2O)

Composition:

Molecular Weight = 219.91 gm

Yttrium 40.43 % Y 51.34 % Y₂O₃

Phosphorus 14.08 % P 32.27 % P₂O₅

Hydrogen 1.83 % H 16.38 % H₂O

Oxygen 43.65 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Y(PO₄)·2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1865

Locality:

Trefoil mine, near Bodmin, Cornwall, England. Link to MinDat.org Location Data.

Name Origin:

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

Synonym:

ICSD 75246

PDF 8-167

Weinschenkite

Churchite-(Y) Image

Images:

Churchite-(Y)

Comments: Acicular, radiating crystals of churchite-(Y).
Location: Leoni mine, Auerbach, Bavaria, Germany. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Churchite-(Y) Crystallography

Axial Ratios:

a:b:c =0.3705:1:0.4088

Cell Dimensions:

a = 5.61, b = 15.14, c = 6.19, Z = 4; beta = 115.3° V = 475.32 Den(Calc)= 3.07

Crystal System:

MonoclinicSpace Group: A2/a,Aa

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.21(1), 3.02(0.9), 7.5(0.9),

Crystal Structure:

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Kohlmann M , Sowa H , Reithmayer K , Schulz H , Kruger R R , Abriel W , Acta Crystallographica, Section C , 50 (1994) p.1651-1652, Structure of a Y(1-x)(Gd,Dy,Er)xPO4*2H2O microcrystal using synchrotron radiation, Note: anisoU s taken from ICSD, Note: isostructural with gypsum, Locality: synthetic

Physical Properties of Churchite-(Y)

Cleavage:

[101] Perfect

Color:

Colorless, Gray, Snow white.

Density:

3.265

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Churchite-(Y)

Gladstone-Dale:

CI meas= 0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2075,KPDmeas= 0.1951,KC= 0.202

Optical Data:

Biaxial (+), a=1.623, b=1.631, g=1.657, bire=0.0340, 2V(Calc)=60, 2V(Meas)=10.

Calculated Properties of Churchite-(Y)

Electron Density:

r_electron=2.96 gm/cc
note: r_{Churchite-(Y)}=3.07 gm/cc.

Fermion Index

Fermion Index = 0.00021
Boson Index = 0.99979

Photoelectric:

PE_{Churchite-(Y)}= 49.96 barns/electron
U=PE_{Churchite-(Y)} x r_electron= 147.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Churchite-(Y) is Not Radioactive

Churchite-(Y) Classification

Dana Class:

40.4.6.1 (40)Hydrated Phosphates, etc

(40.4)where A+++ XO4 · x(H2O)

(40.4.6)Dana Group

40.4.6.1 Churchite-(Y) YPO4·2(H2O) A2/a,Aa Mono

40.4.6.2 Churchite-(Nd)! Nd(PO4)·2(H2O) Mono

Strunz Class:

VII/C.25-30 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-(Y) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Churchite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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

Churchite-(Y)

YPO4·2(H2O)
Dana No: 40.4.6.1 Strunz No: VII/C.25-30
Locality:

Notes: