Churchite-(Y) Mineral Data

Advertisment

For more than thirty (30) years, Excalibur Mineral Corp. has been providing private collectors, researchers, major universities and museums throughout the world with reliably identified, rare and unusual mineral samples for science an

McDougall Minerals is based near famous Bancroft, Ontario, at the heart of one of the best mineral regions in Canada

Join the club, silver, gold and platinum-level memberships available as low as $10.00 a month. High quality mineral specimens mailed to your home or school each month. An affordable way to build your collection.

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.

Name Pronunciation:

Churchite-(Y) + Pronunciation

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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
Ncalc = 1.62 - 1.66

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:

Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Churchite-(Y) =3.07 gm/cc.

Fermion Index:

Fermion Index = 0.0002122846
Boson Index = 0.9997877154

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Churchite-(Y) is Not Radioactive

Churchite-(Y) Classification

Dana Class:

40.04.06.01 (40)Hydrated Phosphates, etc

(40.04)where A+++ XO4 · x(H2O)

(40.04.06)Dana Group

40.04.06.01 Churchite-(Y) YPO4•2(H2O) A2/a,Aa Mono

40.04.06.02 Churchite-(Nd)! Nd(PO4)•2(H2O) Mono

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

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 - 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
14 - WWW-MINCRYST

Search for Churchite-(Y) using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Churchite-(Y) :

B and L Fine Minerals Google Search for Churchite-(Y)
Dakota Matrix Minerals Google Search for Churchite-(Y)
Dan & Diana Weinrich Mineral Auctions Google Search for Churchite-(Y)
Excalibur Mineral Corp. Google Search for Churchite-(Y)
John Betts Fine Minerals Google Search for Churchite-(Y)
McDougall Minerals Google Search for Churchite-(Y)
Mineral News Website Link
Mineral of the Month Club Google Search for Churchite-(Y)
Weinrich Minerals, Inc. Google Search for Churchite-(Y)

Ask about Churchite-(Y) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Churchite-(Y)

YPO4•2(H2O)
Dana No: 40.04.06.01 Strunz No: 08.CJ.50
Locality:

Notes: