Decrespignyite-(Y)
A valid IMA mineral species
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About Decrespignyite-(Y)
Formula:
Cu(Y,REE)4(CO3)4(OH)5Cl · 2H2O
Colour:
Bright royal blue to pale blue
Lustre:
Vitreous, Pearly
Hardness:
4
Specific Gravity:
3.64
Crystal System:
Monoclinic
Name:
Honouring Robert James Champion de Crespigny (b. 1950), Chairman of Normandy Mining Ltd. and Chairman of the South Australian Museum, for his contributions to Australian education.
This page provides mineralogical data about Decrespignyite-(Y).
Unique Identifiers
Mindat ID:
9294
Long-form identifier:
mindat:1:1:9294:0
GUID
(UUID V4):
(UUID V4):
bf8d79a7-bd1a-4d14-abed-828b211d7224
IMA Classification of Decrespignyite-(Y)
Approved
IMA Formula:
Y4Cu(CO3)4Cl(OH)5 · 2H2O
Classification of Decrespignyite-(Y)
5.CC.35
5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
C : With rare earth elements (REE)
5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
C : With rare earth elements (REE)
16a.1.11.1
16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)(XO3)Zq
16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)(XO3)Zq
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Dcp-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Decrespignyite-(Y)
Vitreous, Pearly
Colour:
Bright royal blue to pale blue
Streak:
pale blue
Hardness:
4 on Mohs scale
Comment:
Estimated
Fracture:
None observed
Density:
3.64 g/cm3 (Measured) 3.645 g/cm3 (Calculated)
Optical Data of Decrespignyite-(Y)
Type:
Biaxial (-)
RI values:
nα = 1.604(4) nγ = 1.638(3)
Max Birefringence:
δ = 0.034
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Visible
Comments:
Medium strong; X very pale bluish, Y and Z bluish (with greenish tint)
Chemistry of Decrespignyite-(Y)
Mindat Formula:
Cu(Y,REE)4(CO3)4(OH)5Cl · 2H2O
Crystallography of Decrespignyite-(Y)
Crystal System:
Monoclinic
Cell Parameters:
a = 8.899(6) Å, b = 22.77(2) Å, c = 8.589(6) Å
β = 120.06(5)°
β = 120.06(5)°
Ratio:
a:b:c = 0.391 : 1 : 0.377
Unit Cell V:
1506.3 ų
Z:
4
Morphology:
As crusts, coatings and fillings in thin fissures on the slatey country rock.
Comment:
powder Diffraction data indicate the space group is P2, Pm or P2/m. New data by Rius et al. (2020) suggest space group P-3m1 and a= 8.5462(2), c= 22.731(2) Å, but these authors cannot exclude monoclinic symmetry and their model contains several partially occupied sites (disorder is indicated by streaks).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 22.79 Å | (30) |
| 7.463 Å | (30) |
| 7.086 Å | (50) |
| 6.241 Å | (100) |
| 4.216 Å | (30) |
| 3.530 Å | (40) |
| 3.336 Å | (30) |
| 2.143 Å | (30) |
Type Occurrence of Decrespignyite-(Y)
General Appearance of Type Material:
Blue crusts, coatings and fillings in thin fissures. Crusts and spherulitic aggregates are composed of individual tiny pseudohexagonal, often curved platelets.
Synonyms of Decrespignyite-(Y)
Other Language Names for Decrespignyite-(Y)
Common Associates
Associated Minerals Based on Photo Data:
| 17 photos of Decrespignyite-(Y) associated with Kamphaugite-(Y) | Ca(Y,REE)(CO3)2(OH) · H2O |
| 4 photos of Decrespignyite-(Y) associated with Malachite | Cu2(CO3)(OH)2 |
| 4 photos of Decrespignyite-(Y) associated with Tengerite-(Y) | Y2(CO3)3 · 2-3H2O |
| 2 photos of Decrespignyite-(Y) associated with Donnayite-(Y) | NaCaSr3Y(CO3)6 · 3H2O |
| 1 photo of Decrespignyite-(Y) associated with Calcite | CaCO3 |
| 1 photo of Decrespignyite-(Y) associated with Alicewilsonite-(YLa) | Na2Sr2YLa(CO3)6 · 3H2O |
Related Minerals - Strunz-mindat Grouping
| 5.CC. | Alicewilsonite-(YCe) | Na2Sr2YCe(CO3)6 · 3H2O |
| 5.CC. | Alicewilsonite-(YLa) | Na2Sr2YLa(CO3)6 · 3H2O |
| 5.CC. | Yuchuanite-(Y) | Y2(CO3)3 · H2O |
| 5.CC. | Bainbridgeite-(NdCe) | Na2Ba2NdCe(CO3)6 · 3H2O |
| 5.CC.05 | Donnayite-(Y) | NaCaSr3Y(CO3)6 · 3H2O |
| 5.CC.05 | Ewaldite | Ba(Na,Ca,Y,Ce,K)(CO3)2 · 2.6H2O |
| 5.CC.05 | Mckelveyite-(Nd) | NaCaBa3Nd(CO3)6 · 3H2O |
| 5.CC.05 | Mckelveyite-(Y) | NaCaBa3Y(CO3)6 · 3H2O |
| 5.CC.05 | Weloganite | Na2Sr3Zr(CO3)6 · 3H2O |
| 5.CC.05 | Unnamed (MSH UK-37A) | Sr3NaCaY(CO3)6 · 3H2O |
| 5.CC.05 | UM1992-05-CO:CaCeLaNaSr | (Sr,Na,Y,REE,Ca,Ba)2(CO3)2 · H2O |
| 5.CC.05 | Bainbridgeite-(YCe) | Na2Ba2YCe(CO3)6 · 3H2O |
| 5.CC.10 | Tengerite-(Y) | Y2(CO3)3 · 2-3H2O |
| 5.CC.15 | Kimuraite-(Y) | Ca(Y,Nd)2(CO3)4 · 6H2O |
| 5.CC.15 | Lokkaite-(Y) | Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2O |
| 5.CC.15 | Hizenite-(Y) | Ca2Y6(CO3)11 · 14H2O |
| 5.CC.20 | Shomiokite-(Y) | Na3Y[CO3]3 · 3H2O |
| 5.CC.25 | Calkinsite-(Ce) | (Ce,La)2(CO3)3 · 4H2O |
| 5.CC.25 | Lanthanite-(Ce) | (Ce,La,Nd)2(CO3)3 · 8H2O |
| 5.CC.25 | Lanthanite-(La) | (La,Ce)2(CO3)3 · 8H2O |
| 5.CC.25 | Lanthanite-(Nd) | (Nd,La)2(CO3)3 · 8H2O |
| 5.CC.30 | Adamsite-(Y) | NaY[CO3]2 · 6H2O |
| 5.CC.40 | Galgenbergite-(Ce) | Ca(Ce,La,Nd)2(CO3)4 · H2O |
| 5.CC.45 | Lecoqite-(Y) | Na3Y(CO3)3 · 6H2O |
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 Decrespignyite-(Y)
mindat.org URL:
https://www.mindat.org/min-9294.html
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External Links:
References for Decrespignyite-(Y)
Reference List:
Wallwork, K., Kolitsch, U., Pring, A., Nasdala, L. (2002) Decrespignyite-(Y), a new copper yttrium rare earth carbonate chloride hydrate from Paratoo, South Australia. Mineralogical Magazine, 66 (1) 181-188 doi:10.1180/0026461026610021
Rius, Jordi, Colombo, Fernando, Vallcorba, Oriol, Torrelles, Xavier, Gemmi, Mauro, Mugnaioli, Enrico (2020) Structural study of decrespignyite-(Y), a complex yttrium rare earth copper carbonate chloride, by three-dimensional electron and synchrotron powder diffraction. European Journal of Mineralogy, 32 (5) 545-555 doi:10.5194/ejm-32-545-2020
Localities for Decrespignyite-(Y)
symbol to view information about a locality.
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.
Australia (TL) | |
| Wallwork et al. (2002) |
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Paratoo copper Mine, Peterborough, South Flinders Ranges, Flinders Ranges, South Australia, Australia