Mineralogy Database

Petersite-(Y) Mineral Data

Search Webmineral :

General Petersite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6•3(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Y0.5Ce0.3Nd0.1Ca0.1Cu6(PO4)3(OH)6•3(H2O)
Help on Environment: Environment: Brecciated hornfels in a traprock quarry.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Laurel (Big Snake) Hill, Secaucus, Hudson County, New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Name Pronunciation: Name Pronunciation: Petersite-(Y) + Pronunciation Say PETERSITE-(Y)

Petersite-(Y) Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


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

Help on Axial Ratios: Axial Ratios: a:c = 1:0.44227
Help on Cell Dimensions: Cell Dimensions: a = 13.288, c = 5.877, Z = 2; V = 898.68 Den(Calc)= 3.43
Help on Crystal System: 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/Io): 11.6(1), 2.433(0.6), 4.36(0.5),

Physical Properties of Petersite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow green.
Help on Density: Density: 3.41
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Petersite-(Y)

Help on Dichroism (e): Dichroism (e): light yellowish green.
Help on Dichroism (w): Dichroism (w): green.
Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.666, e=1.747, bire=0.0810.

Calculated Properties of Petersite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.28 gm/cc
note: Specific Gravity of Petersite-(Y) =3.43 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0033677057
Boson Index = 0.9966322943
Help on Photoelectric: Photoelectric: PEPetersite-(Y) = 54.92 barns/electron
U=PEPetersite-(Y) x relectron= 180.37 barns/cc.
Help on Radioactivity: 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
Curies (Ci)
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

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.05)where (A)2 (XO4) Zq � x(H2O)
  (42.05.02)Mixite group (Phosphate series) Petersite-(Y) (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6•3(H2O) P 63/m 6/m Calciopetersite! CaCu6[(PO4)2(PO3OH)(OH)6]•3(H2O) P 63/m 6/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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

Search for Petersite-(Y) using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Petersite-(Y) :

Ask about Petersite-(Y) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

Print or Cut-and-Paste your Petersite-(Y) Specimen Label here :


Dana No: Strunz No: 08.DL.15





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.