Churchite-(Dy)
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Formula:
(Dy,Sm,Gd,Nd)PO4 · 2H2O
Lustre:
Vitreous
Hardness:
3
Crystal System:
Monoclinic
Name:
Named for Arthur Hubert Church (1834-1915), English chemist who described and analyzed the mineral.
Almost certainly misidentified churchite-(Y).
Walenta (1995) states in his description of churchite minerals from the Black Forest: "An Seltenen Erden sind Dy, Sm, Gd und Nd vertreten, Y ist dagegen nur in sehr geringen Mengen nachweisbar. Es ist also kein Churchit-(Y), sondern am ehesten ein Churchit-(Dy)". [The name was published without approval; no quantitative data were given.]
No modern quantitative chemical analyses of Walenta's (1995) sample are available, but a re-analysis of a "churchite-(Dy)" from Menzenschwand, Black Forest, clearly showed it to be a churchite-(Y) containing very minor Gd and Dy (Kolitsch & Brandstätter, unpubl. results, 2010).
In SEM-EDS spectra there might be a problem of overlap of the Dy L(alpha1+2) lines with the Fe K(alpha) line (the partial Y/P peak overlap is another serious problem for correct quantification - if the Y peaks have been recognised as such!).
Compare also the highly questionable Agardite-(Dy).
Walenta (1995) states in his description of churchite minerals from the Black Forest: "An Seltenen Erden sind Dy, Sm, Gd und Nd vertreten, Y ist dagegen nur in sehr geringen Mengen nachweisbar. Es ist also kein Churchit-(Y), sondern am ehesten ein Churchit-(Dy)". [The name was published without approval; no quantitative data were given.]
No modern quantitative chemical analyses of Walenta's (1995) sample are available, but a re-analysis of a "churchite-(Dy)" from Menzenschwand, Black Forest, clearly showed it to be a churchite-(Y) containing very minor Gd and Dy (Kolitsch & Brandstätter, unpubl. results, 2010).
In SEM-EDS spectra there might be a problem of overlap of the Dy L(alpha1+2) lines with the Fe K(alpha) line (the partial Y/P peak overlap is another serious problem for correct quantification - if the Y peaks have been recognised as such!).
Compare also the highly questionable Agardite-(Dy).
Unique Identifiers
Mindat ID:
6874
Long-form identifier:
mindat:1:1:6874:7
Similar Names
| Churchite-(Nd) | A discredited species name | Nd(PO4) · 2H2O |
| Churchite-(Y) | A valid IMA mineral species - grandfathered | Y(PO4) · 2H2O |
IMA Classification of Churchite-(Dy)
IMA status notes:
Published without approval
Classification of Churchite-(Dy)
8.CJ.27
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
Physical Properties of Churchite-(Dy)
Vitreous
Hardness:
3 on Mohs scale
Chemistry of Churchite-(Dy)
Mindat Formula:
(Dy,Sm,Gd,Nd)PO4 · 2H2O
Element Weights:
Crystallography of Churchite-(Dy)
Crystal System:
Monoclinic
Other Language Names for Churchite-(Dy)
Russian:Черчит-(Dy)
Related Minerals - Strunz-mindat Grouping
| 8.CJ. | Airdite | Sr(V4+O)2(PO4)2 · 4H2O |
| 8.CJ. | Dobšináite | Ca2Ca(AsO4)2 · 2H2O |
| 8.CJ. | Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O |
| 8.CJ. | Caesiumpharmacosiderite | CsFe3+4[(AsO4)3(OH)4] · 4H2O |
| 8.CJ. | Jeankempite | Ca5(AsO4)2(HAsO4)2 · 7H2O |
| 8.CJ.05 | Stercorite | (NH4)Na(PO3OH) · 4H2O |
| 8.CJ.10 | Swaknoite | (NH4)2Ca(PO3OH)2 · H2O |
| 8.CJ.10 | Mundrabillaite | (NH4)2Ca(PO3OH)2 · H2O |
| 8.CJ.15 | Nabaphite | NaBaPO4 · 9H2O |
| 8.CJ.15 | Nastrophite | Na(Sr,Ba)PO4 · 9H2O |
| 8.CJ.20 | Haidingerite | CaHAsO4 · H2O |
| 8.CJ.25 | Rhabdophane-(Y) | YPO4 · H2O |
| 8.CJ.25 | Vladimirite | Ca4(AsO4)2(AsO3OH) · 4H2O |
| 8.CJ.30 | Ferrarisite | Ca5(AsO4)2(HAsO4)2 · 9H2O |
| 8.CJ.35 | Fulbrightite | Ca(V4+O)2(As5+O4)2 · 4H2O |
| 8.CJ.35 | Machatschkiite | (Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O |
| 8.CJ.40 | Rauenthalite | Ca3(AsO4)2 · 10H2O |
| 8.CJ.40 | Phaunouxite | Ca3(AsO4)2 · 11H2O |
| 8.CJ.45 | Brockite | (Ca,Th,Ce)PO4 · H2O |
| 8.CJ.45 | Smirnovskite | (Th,Ca)PO4 · nH2O |
| 8.CJ.45 | Rhabdophane-(Ce) | Ce(PO4) · 0.6H2O |
| 8.CJ.45 | Rhabdophane-(La) | La(PO4) · H2O |
| 8.CJ.45 | Rhabdophane-(Nd) | Nd(PO4) · H2O |
| 8.CJ.45 | Tristramite | (Ca,U4+,Fe3+)(PO4,SO4) · 2H2O |
| 8.CJ.45 | Grayite | (Th,Pb,Ca)(PO4) · H2O |
| 8.CJ.45 | Štěpite | U(AsO3OH)2 · 4H2O |
| 8.CJ.47 | Vysokýite | U4+[AsO2(OH)2]4 · 4H2O |
| 8.CJ.50 | Churchite-(Y) | Y(PO4) · 2H2O |
| 8.CJ.50 | Brushite | Ca(PO3OH) · 2H2O |
| 8.CJ.50 | Ardealite | Ca2(PO3OH)(SO4) · 4H2O |
| 8.CJ.50 | Pharmacolite | Ca(HAsO4) · 2H2O |
| 8.CJ.50 | 'Churchite-(Nd)' | Nd(PO4) · 2H2O |
| 8.CJ.55 | Mcnearite | NaCa5(AsO4)(HAsO4)4 · 4H2O |
| 8.CJ.60 | Dorfmanite | Na2(PO3OH) · 2H2O |
| 8.CJ.65 | Sincosite | Ca(V4+O)2(PO4)2 · 4H2O |
| 8.CJ.65 | Bariosincosite | Ba(V4+O)2(PO4)2 · 4H2O |
| 8.CJ.70 | Catalanoite | Na2(PO3OH) · 8H2O |
| 8.CJ.75 | Guérinite | Ca6(HAsO4)3(AsO4)2 · 10.5H2O |
| 8.CJ.85 | Ningyoite | (U,Ca,Ce)2(PO4)2 · 1-2H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Churchite-(Dy)
mindat.org URL:
https://www.mindat.org/min-6874.html
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References for Churchite-(Dy)
Localities for Churchite-(Dy)
Showing 1 localities.
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Germany | |
| Walenta (1989) +1 other reference |
