Mineralogy Database

Churchite-(Y) Mineral Data

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General Churchite-(Y) Information

Help on Chemical  Formula: Chemical Formula: YPO4•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Y(PO4)•2(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1865
Help on Locality: Locality: Trefoil mine, near Bodmin, Cornwall, England. 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.
Help on Name Pronunciation: Name Pronunciation: Churchite-(Y) + Pronunciation Say CHURCHITE-(Y)
Help on Synonym: Synonym: ICSD 75246
  PDF 8-167

Churchite-(Y) Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.3705:1:0.4088
Help on Cell Dimensions: Cell Dimensions: a = 5.61, b = 15.14, c = 6.19, Z = 4; beta = 115.3° V = 475.32 Den(Calc)= 3.07
Help on Crystal System: Crystal System: Monoclinic Space Group: A2/a,Aa
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.21(1), 3.02(0.9), 7.5(0.9),

Physical Properties of Churchite-(Y)

Help on Cleavage: Cleavage: {101} Perfect
Help on Color: Color: Colorless, Gray, Snow white.
Help on Density: Density: 3.265
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Churchite-(Y)

Help on Gladstone-Dale: 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
Ncalc = 1.62 - 1.66
Help on Optical Data: 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)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Churchite-(Y) =3.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002122846
Boson Index = 0.9997877154
Help on Photoelectric: Photoelectric: PEChurchite-(Y) = 49.96 barns/electron
U=PEChurchite-(Y) x rElectron Density= 147.86 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Churchite-(Y) is Not Radioactive

Churchite-(Y) Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.04)where A+++ XO4 � x(H2O)
  (40.04.06)Dana Group Churchite-(Y) YPO4•2(H2O) A2/a,Aa Mono Churchite-(Nd)! Nd(PO4)•2(H2O) Mono
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-(Y) Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Churchite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 08.CJ.50





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