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Decrespignyite-(Y)

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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).


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Classification of Decrespignyite-(Y)Hide

Approved
5.CC.35

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

Physical Properties of Decrespignyite-(Y)Hide

Vitreous, Pearly
Colour:
Bright royal blue to pale blue
Streak:
pale blue
Hardness:
Comment:
Estimated
Fracture:
None observed
Density:
3.64 g/cm3 (Measured)    3.645 g/cm3 (Calculated)

Optical Data of Decrespignyite-(Y)Hide

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.
Surface Relief:
Moderate
Pleochroism:
Visible
Comments:
Medium strong; X very pale bluish, Y and Z bluish (with greenish tint)

Chemical Properties of Decrespignyite-(Y)Hide

Formula:
Cu(Y,REE)4(CO3)4(OH)5Cl · 2H2O
IMA Formula:
Y4Cu(CO3)4Cl(OH)5 · 2H2O

Crystallography of Decrespignyite-(Y)Hide

Crystal System:
Monoclinic
Cell Parameters:
a = 8.899(6) Å, b = 22.77(2) Å, c = 8.589(6) Å
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.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
22.79 (30)
7.463 (30)
7.086 (50)
6.241 (100)
4.216 (30)
3.530 (40)
3.336 (30)
2.143 (30)

Type Occurrence of Decrespignyite-(Y)Hide

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)Hide

Other Language Names for Decrespignyite-(Y)Hide

Simplified Chinese:碳氯钇铜矾
Traditional Chinese:碳氯釔銅礬

Common AssociatesHide

Associated Minerals Based on Photo Data:
Kamphaugite-(Y)12 photos of Decrespignyite-(Y) associated with Kamphaugite-(Y) on mindat.org.
Donnayite-(Y)2 photos of Decrespignyite-(Y) associated with Donnayite-(Y) on mindat.org.
Malachite1 photo of Decrespignyite-(Y) associated with Malachite on mindat.org.
Tengerite-(Y)1 photo of Decrespignyite-(Y) associated with Tengerite-(Y) on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.CC.05Donnayite-(Y)NaCaSr3Y(CO3)6 · 3H2OTric. 1 : P1
5.CC.05EwalditeBa(Na,Ca,Y,Ce,K)(CO3)2 · 2.6H2OHex. 6mm
5.CC.05Mckelveyite-(Nd)(Ba,Sr)(Nd,Ce,La)(CO3)2 · 4-10H2OTric.
5.CC.05Mckelveyite-(Y)NaCaBa3Y(CO3)6 · 3H2OTric. 1 : P1
5.CC.05WeloganiteNa2Sr3Zr(CO3)6 · 3H2OTric. 1 : P1
5.CC.10Tengerite-(Y)Y2(CO3)3 · 2-3H2OOrth. mmm (2/m 2/m 2/m) : Pnnm
5.CC.15Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2OOrth.
5.CC.15Lokkaite-(Y)Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2OOrth.
5.CC.20Shomiokite-(Y)Na3Y[CO3]3 · 3H2OOrth.
5.CC.25Calkinsite-(Ce)(Ce,La)2(CO3)3 · 4H2OOrth.
5.CC.25Lanthanite-(Ce)(Ce,La,Nd)2(CO3)3 · 8H2OOrth. mmm (2/m 2/m 2/m)
5.CC.25Lanthanite-(La)(La,Ce)2(CO3)3 · 8H2OOrth.
5.CC.25Lanthanite-(Nd)(Nd,La)2(CO3)3 · 8H2OOrth.
5.CC.30Adamsite-(Y)NaY[CO3]2 · 6H2OTric. 1 : P1
5.CC.40Galgenbergite-(Ce)Ca(Ce,La,Nd)2(CO3)4 · H2OTric.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Decrespignyite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
K. Wallwork, U. Kolitsch, A. Pring and L. Nasdala (2002) Decrespignyite-(Y), a new copper yttrium rare earth carbonate chloride hydrate from Paratoo, South Australia. Mineralogical Magazine: 66, 181-188.

Internet Links for Decrespignyite-(Y)Hide

Localities for Decrespignyite-(Y)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • South Australia
    • Olary Province
      • Yunta
K. Wallwork, U. Kolitsch, A. Pring and L. Nasdala (2002): Decrespignyite-(Y), a new copper yttrium rare earth carbonate chloride hydrate from Paratoo, South Australia. Mineralogical Magazine 66, 181-188.
Mineral and/or Locality  
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