Petersite-(Y) Mineral Data

General Petersite-(Y) Information

Chemical Formula:

(Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6•3(H2O)

Composition:

Molecular Weight = 927.20 gm

Calcium 0.43 % Ca 0.60 % CaO

Cerium 4.53 % Ce 5.31 % Ce₂O₃

Yttrium 4.79 % Y 6.09 % Y₂O₃

Copper 41.12 % Cu 51.47 % CuO

Phosphorus 10.02 % P 22.96 % P₂O₅

Hydrogen 1.30 % H 11.66 % H₂O

Neodymium 1.56 % Nd 1.81 % Nd₂O₃

Oxygen 36.24 % O

______ ______

100.00 % 99.91 % = TOTAL OXIDE

Empirical Formula:

Y_0.5Ce_0.3Nd_0.1Ca_0.1Cu₆(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.

Name Pronunciation:

Petersite-(Y) + Pronunciation

Petersite-(Y) Image

Images:

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

Petersite-(Y) Crystallography

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 - Dipyramidal H-M Symbol (6/m) Space Group: P 6₃/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 11.6(1), 2.433(0.6), 4.36(0.5),

Physical Properties of Petersite-(Y)

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

Optical Properties of Petersite-(Y)

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
Ncalc = 1.65

Optical Data:

Uniaxial (+), w=1.666, e=1.747, bire=0.0810.

Calculated Properties of Petersite-(Y)

Electron Density:

Bulk Density (Electron Density)=3.28 gm/cc
note: Specific Gravity of Petersite-(Y) =3.43 gm/cc.

Fermion Index:

Fermion Index = 0.0033677057
Boson Index = 0.9966322943

Photoelectric:

PE_{Petersite-(Y)}= 54.92 barns/electron
U=PE_{Petersite-(Y)} x r_electron= 180.37 barns/cc.

Radioactivity:

GRapi = 6,219.10 (Gamma Ray American Petroleum Institute Units)
Concentration of Petersite-(Y) per GRapi unit = 160.79 (PPM)

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)

Petersite-(Y) Classification

Dana Class:

42.05.02.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.05)where (A)2 (XO4) Zq ï¿½ x(H2O)

(42.05.02)Mixite group (Phosphate series)

42.05.02.01 Petersite-(Y) (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6•3(H2O) P 6₃/m 6/m

42.05.02.02 Calciopetersite! CaCu6[(PO4)2(PO3OH)(OH)6]•3(H2O) P 6₃/m 6/m

Strunz Class:

08.DL.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DL -With large and medium-sized cations, (OH, etc.):RO4 = 2:1

08.DL.15 Agardite-(Dy)! (Dy,La,Ca)Cu6(AsO4)3(OH)6•3(H2O) 6/m

08.DL.15 Agardite-(Ca)! CaCu6(AsO4)3(OH)6•3(H2O) 6/m

08.DL.15 Agardite-(Ce)! (Ce,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

08.DL.15 Agardite-(La)! (La,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

08.DL.15 Agardite-(Nd)! (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6•3(H2O) 6/m

08.DL.15 Agardite-(Y) (Y,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

08.DL.15 Goudeyite (Al,Y)Cu6(AsO4)3(OH)6•3(H2O) Unk Hex

08.DL.15 Zalesiite! (Ca,Y)Cu6[(AsO4)2(AsO3OH)(OH)6]•3(H2O) P 6₃/m 6/m

08.DL.15 Mixite BiCu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

08.DL.15 Petersite-(Y) (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6•3(H2O) P 6₃/m 6/m

08.DL.15 Calciopetersite! CaCu6[(PO4)2(PO3OH)(OH)6]•3(H2O) P 6₃/m 6/m

08.DL.15 Plumboagardite! (Pb,REE,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

Other Petersite-(Y) Information

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 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Petersite-(Y)

(Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6•3(H2O)
Dana No: 42.05.02.01 Strunz No: 08.DL.15
Locality:

Notes:

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