General Petersite-(Y) Information
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Chemical Formula: |
(Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6·3(H2O) |
Composition: |
Molecular Weight = 927.20 gm |
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Calcium 0.43 % Ca 0.60 % CaO |
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Cerium 4.53 % Ce 5.31 % Ce2O3 |
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Yttrium 4.79 % Y 6.09 % Y2O3 |
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Copper 41.12 % Cu 51.47 % CuO |
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Phosphorus 10.02 % P 22.96 % P2O5 |
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Hydrogen 1.30 % H 11.66 % H2O |
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Neodymium 1.56 % Nd 1.81 % Nd2O3 |
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Oxygen 36.24 % O |
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______ ______ |
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100.00 % 99.91 % = TOTAL OXIDE |
Empirical Formula: |
Y0.5Ce0.3Nd0.1Ca0.1Cu6(PO4)3(OH)6·3(H2O) |
Environment: |
Brecciated hornfels in a traprock quarry. |
IMA Status: |
Approved IMA 1982 |
Locality: |
Laurel (Big Snake) Hill, Secaucus, Hudson County, New Jersey, USA. Link to MinDat.org Location Data. |
Name Origin: |
Named for Thomas A. Peters (1947-) and Joseph Peters (1951-), curators of minerals at the Paterson, New Jersey museum and the American Museum of Natural History, New York, respecti vely. |
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Petersite-(Y) Image |
Images:
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Petersite-(Y)
Comments: Fine, light green, acicular crystals of petersite-(Y) to less than 0.2mm occupying an area of about 1mm on dark green malachite.
Location: Laurel Hill, Hudson Co., New Jersey, USA.
Scale: Picture size .5 cm.
© Tom Loomis / Dakota Matrix |
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Petersite-(Y) Crystallography
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Axial Ratios: |
a:c = 1:0.44227 |
Cell Dimensions: |
a = 13.288, c = 5.877, Z = 2; V = 898.68 Den(Calc)= 3.43 |
Crystal System: |
Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 63/m |
X Ray Diffraction: |
By Intensity(I/Io): 11.6(1), 2.433(0.6), 4.36(0.5), |
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Physical Properties of Petersite-(Y)
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Cleavage: |
None |
Color: |
Yellow green. |
Density: |
3.41 |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
Hardness: |
3-4 - Calcite-Fluorite |
Luminescence: |
Non-fluorescent. |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Petersite-(Y)
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Dichroism (e): |
light yellowish green. |
Dichroism (w): |
green. |
Gladstone-Dale: |
CI meas= -0.085 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.079 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.206,KPDmeas= 0.2072,KC= 0.1909 |
Optical Data: |
Uniaxial (+), w=1.666, e=1.747, bire=0.0810. |
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Calculated Properties of Petersite-(Y)
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Electron Density: |
relectron=3.28 gm/cc note: rPetersite-(Y) =3.43 gm/cc. |
Fermion Index |
Fermion Index = 0.00336 Boson Index = 0.99664 |
Photoelectric: |
PEPetersite-(Y) = 54.92 barns/electron U=PEPetersite-(Y) x relectron= 180.37 barns/cc. |
Radioactivity: |
GRapi = 6,219.10 (Gamma Ray American Petroleum Institute Units)
Petersite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Petersite-(Y) - mild
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 / 8.23 cm |
136,397 |
3.69E-06 |
6,219.10 |
2.04 |
| 100 gm / 3.82 cm |
13,640 |
3.69E-07 |
621.91 |
0.20 |
| 10 gm / 1.77 cm |
1,364 |
3.69E-08 |
62.19 |
0.02 |
| 1 gm / 8.23 mm |
136 |
3.69E-09 |
6.22 |
0.00 |
| 0.1 gm / 3.82 mm |
14 |
3.69E-10 |
0.62 |
0.00 |
| 0.01 gm / 1.77 mm |
1 |
3.69E-11 |
0.06 |
0.00 |
| 0.001 gm / 0.82 mm |
0 |
3.69E-12 |
0.01 |
0.00 |
Weight of pure Petersite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.43 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 ( 0.30 % Th) From Sum REE Elements ( 6.09 % REE)
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Petersite-(Y) Classification
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Dana Class: |
42.5.2.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.5)where (A)2 (XO4) Zq · x(H2O) |
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(42.5.2)Mixite group (Phosphate series) |
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42.5.2.1 Petersite-(Y) (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6·3(H2O) P 63/m 6/m |
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42.5.2.2 IMA2001-004! CaCu6[(PO4)2(PO3OH)(OH)6]·3(H2O) P 63/m 6/m |
Strunz Class: |
VII/D.53-10 VII - Phosphates, Arsenates and Vanadates |
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VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K |
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VII/D.53 - Mixite - Agardite group |
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VII/D.53-10 Petersite-(Y) (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6·3(H2O) P 63/m 6/m |
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VII/D.53-20 Goudeyite (Al,Y)Cu6(AsO4)3(OH)6·3(H2O) Unk Hex |
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VII/D.53-30 Zalesiite! (Ca,Y)Cu6[(AsO4)2(AsO3OH)(OH)6]·3(H2O) P 63/m 6/m |
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VII/D.53-40 Agardite-(Y) (Y,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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VII/D.53-50 Agardite-(La)! (La,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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VII/D.53-60 Agardite-(Ce)! (Ce,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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VII/D.53-70 Agardite-(Nd)! (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m |
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VII/D.53-80 Agardite-(Dy)! (Dy,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m |
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VII/D.53-90 Mixite BiCu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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VII/D.53-95 Juanitaite! (Cu,Ca,Fe)10Bi(AsO4)4(OH)11·2(H2O) P 41/nnm 4/m 2/m 2/m |
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VII/D.53-100 Mrazekite Bi2Cu3(PO4)2O2(OH)2·2(H2O) P 21/n 2/m |
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Other Petersite-(Y) Information
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References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) |
See Also: |
Links to other databases for Petersite-(Y) :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
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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Print or Cut-and-Paste your Petersite-(Y) Specimen Label here :
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Petersite-(Y)
(Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6·3(H2O)
Dana No: 42.5.2.1 Strunz No: VII/D.53-10
Locality:
Notes:
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