Decrespignyite-(Y) Mineral Data

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General Decrespignyite-(Y) Information
Help on Chemical Formula: Chemical Formula: (Y,REE)4Cu(CO3)4Cl(OH)5·2(H2O)
Help on Composition: Composition: Molecular Weight = 867.49 gm
   Calcium         0.32 %  Ca    0.45 % CaO
   Lanthanum       0.32 %  La    0.38 % La2O3
   Praeseodymium   0.16 %  Pr    0.19 % Pr2O3
   Samarium        0.87 %  Sm    1.00 % Sm2O3
   Gadolinium      3.99 %  Gd    4.60 % Gd2O3
   Dysprosium      3.18 %  Dy    3.65 % Dy2O3
   Yttrium        32.08 %  Y    40.74 % Y2O3
   Holmium         2.28 %  Ho    2.61 % Ho2O3
   Erbium          2.12 %  Er    2.43 % Er2O3
   Terbium         0.37 %  Tb    0.42 % Tb2O3
   Copper          8.42 %  Cu   10.55 % CuO
   Hydrogen        1.17 %  H    10.45 % H2O
   Carbon          5.22 %  C    19.13 % CO2
   Neodymium       1.00 %  Nd    1.16 % Nd2O3
   Chlorine        2.90 %  Cl    2.90 % Cl
                    -   %   Cl   -0.65 % -O=Cl2
   Oxygen         35.60 %  O
                 ______        ______ 
                 100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y3.13Gd0.22Dy0.17Ho0.12Er0.11Ca0.07Nd0.06Sm0.05Tb0.02La0.02Pr0.01Cu1.15(CO3)3.77Cl0.71 (OH)0.29(OH)5.63·2.07(H2O)
Help on Environment: Environment: Supergene product with other Y-bearing copper minerals.
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Paratoo copper mine, Yunta, Olary Province, South Australia, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Robert James Champion de Crespigny (1950-), Chancellor of the University of Adelaide, Australia.
Help on Synonym: Synonym: IMA2001-027
 

Decrespignyite-(Y) Image

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Decrespignyite-(Y)

Comments: Blue, rounded aggregates of decrespignyite-(Y) on matrix.
Location: Paratoo copper mine, Yunta, Olary Province, South Australia, Australia. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Decrespignyite-(Y) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.3908:1:0.3772
Help on Cell Dimensions: Cell Dimensions: a = 8.899, b = 22.77, c = 8.589, Z = 4; beta = 120.06° V = 1,506.31 Den(Calc)= 3.83
Help on Crystal System: Crystal System: MonoclinicSpace Group: P 2, Pm or P 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.241(1)(021), 7.086(0.5)(011), 3.53(0.4)(022),2.143(0.3)(222,401), 7.463(0.3)(001), 22.79(0.3)(010), 3.336(0.3)(032), 4.216(0.3)(112),
 

Physical Properties of Decrespignyite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Intense royal blue, Turquoise blue.
Help on Density: Density: 3.64
Help on Diaphaniety: Diaphaniety: Transparent
Help on Habit: Habit: Efflorescences - Crystals covering matrix, generally produced from transpiro-evaporation.
Help on Habit: Habit: Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: pale blue
 

Optical Properties of Decrespignyite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.115 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.159 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1621,KPDmeas= 0.1706,KC= 0.1928
Help on Optical Data: Optical Data: Biaxial (-), a=1.604, g=1.638, bire=0.0340
 

Calculated Properties of Decrespignyite-(Y)

Help on Electron Density: Electron Density:

relectron=3.41 gm/cc
note: rDecrespignyite-(Y) =3.64 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.05176
Boson Index = 0.94824
Help on Photoelectric: Photoelectric:

PEDecrespignyite-(Y) = 149.05 barns/electron
U=PEDecrespignyite-(Y) x relectron= 508.51 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 14,333.21 (Gamma Ray American Petroleum Institute Units)

Decrespignyite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Decrespignyite-(Y) - weak
Specimen
Size
Weight/Volume
(Sphere) *		 Calculated
Activity
Bequerols
(Bq)		 Calculated
Activity
Curies (Ci)		 Estimated
Activity
GR(api)		 Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 8.07 cm 321,155 8.68E-06 14,333.21 4.71
100 gm / 3.74 cm 32,116 8.68E-07 1,433.32 0.47
10 gm / 1.74 cm 3,212 8.68E-08 143.33 0.05
1 gm / 8.07 mm 321 8.68E-09 14.33 0.00
0.1 gm / 3.74 mm 32 8.68E-10 1.43 0.00
0.01 gm / 1.74 mm 3 8.68E-11 0.14 0.00
0.001 gm / 0.81 mm 0 8.68E-12 0.01 0.00

Weight of pure Decrespignyite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.64 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.71 % Th) From Sum REE Elements (14.29 % REE)
 

Decrespignyite-(Y) Classification
Help on Dana Class: Dana Class: 16a.1.11.1 (16a)Carbonates - Hydroxyl or Halogen
  (16a.1)in the Bastnasite/Shynchysite/Parasite Groups
  (16a.1.11)Dana Group
 
16a.1.11.1 Decrespignyite-(Y) ! (Y,REE)4Cu(CO3)4Cl(OH)5·2(H2O) P 2, Pm or P 2/m Mono
Help on Strunz Class: Strunz Class: V/E.07-30 V - Nitrates, Carbonates and Borates
  V/E - Water-bearing carbonates with unfamiliar anions
  V/E.07 - Claraite series
 
V/E.07-10 Callaghanite Cu2Mg2(CO3)(OH)6·2(H2O) C 2/c 2/m
 
V/E.07-20 Claraite (Cu,Zn)3(CO3)(OH)4·4(H2O) P1 or P1 Tri
 
V/E.07-30 Decrespignyite-(Y) (Y,REE)4Cu(CO3)4Cl(OH)5·2(H2O) P 2, Pm or P 2/m Mono
 

Other Decrespignyite-(Y) Information
Help on References: References: NAME( AmMin, 87:1731) PHYS. PROP.(AmMin, 87:1731) OPTIC PROP.(AmMin, 87:1731)
Help on See Also: See Also: Links to other databases for Decrespignyite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Decrespignyite-(Y)

(Y,REE)4Cu(CO3)4Cl(OH)5·2(H2O)
Dana No: 16a.1.11.1 Strunz No: V/E.07-30
Locality:

 

Notes:

 
 
   
 
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