Churchite-(Dy)
A material that is NOT an approved mineral species
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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
GUID
(UUID V4):
(UUID V4):
6340d0e6-45d6-4d09-bf72-96c872293be3
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
Crystallography of Churchite-(Dy)
Crystal System:
Monoclinic
Other Language Names for Churchite-(Dy)
Russian:Черчит-(Dy)
Related Minerals - Strunz-mindat Grouping
8.CJ. | Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O |
8.CJ. | Caesiumpharmacosiderite | CsFe4[(AsO4)3(OH)4] · 4H2O |
8.CJ. | Jeankempite | Ca5(AsO4)2(HAsO4)2 · 7H2O |
8.CJ. | Airdite | Sr(V4+O)2(PO4)2 · 4H2O |
8.CJ. | Dobšináite | Ca2Ca(AsO4)2 · 2H2O |
8.CJ.05 | Stercorite | (NH4)Na(PO3OH) · 4H2O |
8.CJ.10 | Mundrabillaite | (NH4)2Ca(PO3OH)2 · H2O |
8.CJ.10 | Swaknoite | (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 | Vladimirite | Ca4(AsO4)2(AsO3OH) · 4H2O |
8.CJ.25 | Rhabdophane-(Y) | YPO4 · H2O |
8.CJ.30 | Ferrarisite | Ca5(AsO4)2(HAsO4)2 · 9H2O |
8.CJ.35 | Machatschkiite | (Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O |
8.CJ.35 | Fulbrightite | Ca(VO)2(AsO4)2 · 4H2O |
8.CJ.40 | Phaunouxite | Ca3(AsO4)2 · 11H2O |
8.CJ.40 | Rauenthalite | Ca3(AsO4)2 · 10H2O |
8.CJ.45 | Brockite | (Ca,Th,Ce)PO4 · H2O |
8.CJ.45 | Grayite | (Th,Pb,Ca)(PO4) · H2O |
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,U,Fe)(PO4,SO4) · 2H2O |
8.CJ.45 | Smirnovskite | (Th,Ca)PO4 · nH2O |
8.CJ.45 | Štěpite | U(AsO3OH)2 · 4H2O |
8.CJ.47 | Vysokýite | U4+[AsO2(OH)2]4 · 4H2O |
8.CJ.50 | Ardealite | Ca2(PO3OH)(SO4) · 4H2O |
8.CJ.50 | Brushite | Ca(PO3OH) · 2H2O |
8.CJ.50 | Churchite-(Y) | Y(PO4) · 2H2O |
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(VO)2(PO4)2 · 5H2O |
8.CJ.65 | Bariosincosite | Ba(VO)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)
Reference List:
Localities for Churchite-(Dy)
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
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