Petersite-(Y)
A valid IMA mineral species
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About Petersite-(Y)
Formula:
YCu6(PO4)3(OH)6 · 3H2O
Colour:
Yellowish green
Lustre:
Vitreous, Dull
Hardness:
3 - 4
Specific Gravity:
3.41
Crystal System:
Hexagonal
Member of:
Name:
Originally named petersite in honour of brothers Thomas A. Peters (1947-), curator of minerals at the Paterson, New Jersey museum and Joseph Peters (1951-), curator of minerals at the American Museum of Natural History, New York. The name was chosen in recognition of their contributions to the mineralogy of New Jersey and their curatorial work. The suffix was added by the IMA in 1987 to conform to the Levinson rule for species with essential REE, indicating a predominance of yttrium.
Type Locality:
Unique Identifiers
Mindat ID:
3175
Long-form identifier:
mindat:1:1:3175:8
Similar Names
| Petarasite | A valid IMA mineral species | Na5Zr2(Si6O18)(Cl,OH) · 2H2O |
| Petersenite-(Ce) | A valid IMA mineral species | Na4(Ce,La,Nd)2(CO3)5 |
| Petersite | A synonym | |
| Petersite-(Ce) | A valid IMA mineral species | CeCu6(PO4)3(OH)6 · 3H2O |
| Petersite-(La) | A valid IMA mineral species | LaCu6(PO4)3(OH)6 · 3H2O |
| Pietersite | A variety of 'Chalcedony' [Quartz] | SiO2 |
IMA Classification of Petersite-(Y)
Approved
IMA status notes:
Renamed by the IMA
IMA Formula:
Cu2+6Y(PO4)3(OH)6·3H2O
Approval year:
1981
First published:
1982
Classification of Petersite-(Y)
8.DL.15
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
42.5.2.1
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)7(XO4)3Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)7(XO4)3Zq·xH2O
19.4.10
19 : Phosphates
4 : Phosphates of Ca
19 : Phosphates
4 : Phosphates of Ca
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Pts-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Petersite-(Y)
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Petersite-(Y)
Vitreous, Dull
Transparency:
Translucent
Comment:
Highly vitreous on {1010} to dull on {0001}
Colour:
Yellowish green
Streak:
White
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
3.41 g/cm3 (Measured) 3.40 g/cm3 (Calculated)
Optical Data of Petersite-(Y)
Type:
Uniaxial (+)
RI values:
nω = 1.666(4) nε = 1.747(4)
Max. Birefringence:
δ = 0.081
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Pleochroism:
Strong
Comments:
E > O, with E = green, O = light yellowish green
Chemistry of Petersite-(Y)
Mindat Formula:
YCu6(PO4)3(OH)6 · 3H2O
Element Weights:
Common Impurities:
Ce,Nd,La
Crystallography of Petersite-(Y)
Crystal System:
Hexagonal
Cell Parameters:
a = 13.288(5) Å, c = 5.877(5) Å
Ratio:
a:c = 1 : 0.442
Unit Cell V:
898.68 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Prism {1010} and the pinacoid {0001}.
Comment:
Point Group: 6/m or 6.; Space Group: P63/m or P63.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.6 Å | (100) |
| 4.36 Å | (50) |
| 3.49 Å | (40) |
| 2.877 Å | (40) |
| 2.509 Å | (30) |
| 2.433 Å | (60) |
| 1.961 Å | (20) |
| 1.745 Å | (20) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Petersite-(Y)
General Appearance of Type Material:
Euhedral crystals in isolated sprays to 0.1 mm.
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian Institution), Washington, D.C., USA, number NMNH 148973.
Geological Setting of Type Material:
Secondary mineralization in extensively brecciated hornfels, 30-60 m from contact with diabase stock.
Associated Minerals at Type Locality:
Synonyms of Petersite-(Y)
Petersite (in part)
Other Language Names for Petersite-(Y)
Relationship of Petersite-(Y) to other Species
Member of:
Other Members of Mixite Group:
| Agardite-(Ce) | CeCu6(AsO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Agardite-(La) | LaCu6(AsO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Agardite-(Nd) | NdCu6(AsO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Agardite-(Y) | YCu6(AsO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Calciopetersite | CaCu6(PO4)2(PO3OH)(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Goudeyite | AlCu6(AsO4)3(OH)6 · 3H2O | Hex. |
| Mixite | BiCu6(AsO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Petersite-(Ce) | CeCu6(PO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Petersite-(La) | LaCu6(PO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Plumboagardite | PbCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Zálesíite | CaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O | Hex. 6/m : P63/m |
Common Associates
Associations Based on Photo Data:
| 3 photos of Petersite-(Y) associated with Thometzekite | PbCu2+2(AsO4)2 · 2H2O |
| 1 photo of Petersite-(Y) associated with Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| 1 photo of Petersite-(Y) associated with 'Chalcedony' | SiO2 |
| 1 photo of Petersite-(Y) associated with Opal | SiO2 · nH2O |
Related Minerals - Strunz-mindat Grouping
| 8.DL.05 | Foggite | CaAl(PO4)(OH)2 · H2O |
| 8.DL.10 | Fluorowardite | NaAl3(PO4)2F2(OH)2(H2O)2 |
| 8.DL.10 | Wardite | NaAl3(PO4)2(OH)4 · 2H2O |
| 8.DL.10 | Millisite | (Na,K)CaAl6(PO4)4(OH)9 · 3H2O |
| 8.DL.10 | Cyrilovite | NaFe3+3(PO4)2(OH)4 · 2H2O |
| 8.DL.15 | Petersite-(Ce) | CeCu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Nd) | NdCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Y) | YCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Ce) | CeCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | 'Agardite-(Dy)' | (Dy,La)Cu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(La) | LaCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Zálesíite | CaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O |
| 8.DL.15 | Mixite | BiCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Petersite-(La) | LaCu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Goudeyite | AlCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Calciopetersite | CaCu6(PO4)2(PO3OH)(OH)6 · 3H2O |
| 8.DL.15 | Plumboagardite | PbCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O |
| 8.DL.20 | Dugganite | Pb3Zn3(AsO4)2(TeO6) |
| 8.DL.20 | Wallkilldellite | Ca2Mn2+3(AsO4)2(OH)4 · 9H2O |
| 8.DL.20 | Wallkilldellite-(Fe) | (Ca,Cu)4Fe2+6(AsO4,SiO4)4(OH,O)8 · 18H2O |
| 8.DL.20 | Cheremnykhite | Pb3Zn3(VO4)2(TeO6) |
| 8.DL.20 | Kuksite | Pb3Zn3(PO4)2(TeO6) |
| 8.DL.25 | Angastonite | CaMgAl2(PO4)2(OH)4 · 7H2O |
| 8.DL.30 | Långbanshyttanite | Pb2Mn2Mg(AsO4)2(OH)4 · 6H2O |
Fluorescence of Petersite-(Y)
None observed
Other Information
Notes:
Soluble in 1:1 HCl acid.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Petersite-(Y)
mindat.org URL:
https://www.mindat.org/min-3175.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Petersite-(Y)
Reference List:
Localities for Petersite-(Y)
Showing 11 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Sejkora et al. (2007) |
Germany | |
| [Wittern (1995) |
| Walenta (1992) |
| Wittern (2001) |
Italy | |
| Olmi et al. (1991) |
Japan | |
| Nishio–Hamane et al. (2020) |
| Okamoto et al. (1988) |
Russia | |
| Sustavov et al. (2023) +1 other reference |
South Africa | |
| Atanasova et al. (2016) |
USA | |
| RRUFF Project Specimen ID: R050541 |
| Nick Facciola (finder) +1 other reference |
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Laurel Hill, Secaucus, Hudson County, New Jersey, USA