Pellyite
A valid IMA mineral species
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About Pellyite
The Pelly River, Yukon, Canada
Formula:
Ba2CaFe2+2Si6O17
Colour:
colorless to pale yellow
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
3.51
Crystal System:
Orthorhombic
Name:
After the Pelly River, Yukon Territory, Canada, the headwaters of which are close to the type locality.
This page provides mineralogical data about Pellyite.
Unique Identifiers
Mindat ID:
3145
Long-form identifier:
mindat:1:1:3145:1
Similar Names
| Kellyite | A valid IMA mineral species | Mn22+Al(AlSiO5)(OH)4 |
| Palaite | A synonym of Hureaulite | |
| Pillaite | A valid IMA mineral species | Pb9Sb10S23ClO0.5 |
IMA Classification of Pellyite
Approved
Approval year:
1970
First published:
1972
Classification of Pellyite
9.DO.10
9 : SILICATES (Germanates)
D : Inosilicates
O : Inosilicates with 7-, 8-, 10-, 12- and 14-periodic chains
9 : SILICATES (Germanates)
D : Inosilicates
O : Inosilicates with 7-, 8-, 10-, 12- and 14-periodic chains
78.6.3.1
78 : Unclassified Silicates
6 :
78 : Unclassified Silicates
6 :
14.7.9
14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
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 |
|---|---|---|
| Ply | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Pellyite
Vitreous
Transparency:
Translucent
Colour:
Colorless to pale yellow
Hardness:
6 on Mohs scale
Cleavage:
Poor/Indistinct
Prismatic, poorly developed
Prismatic, poorly developed
Fracture:
Conchoidal
Density:
3.51 g/cm3 (Measured) 3.48 g/cm3 (Calculated)
Optical Data of Pellyite
Type:
Biaxial (+)
RI values:
nα = 1.627 - 1.643 nβ = 1.629 - 1.645 nγ = 1.641 - 1.649
2V:
Measured: 53° to 61°, Calculated: 72°
Max. Birefringence:
δ = 0.006 - 0.014
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:
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 biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
Very strong, r > v.
Chemistry of Pellyite
Mindat Formula:
Ba2CaFe2+2Si6O17
Element Weights:
Common Impurities:
Al,Mn,Zn
Crystallography of Pellyite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 14.209(6) Å, b = 15.677(4) Å, c = 7.151(2) Å
Ratio:
a:b:c = 0.906 : 1 : 0.456
Unit Cell V:
1,592.92 ų (Calculated from Unit Cell)
Z:
4
Comment:
Space Group: Amma
Crystal Structure
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CIF File Best | x | y | z | a | b | c
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Labels
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000493 | Pellyite | Meagher E P (1976) The atomic arrangement of pellyite: Ba2Ca(Fe,Mg)2Si6O17 American Mineralogist 61 67-73 |  | 1976 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.43 Å | (100) |
| 3.19 Å | (65) |
| 2.308 Å | (60) |
| 3.46 Å | (55) |
| 3.83 Å | (50) |
| 2.117 Å | (50) |
| 3.17 Å | (45) |
Comments:
Gun claim, Yukon, Canada. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Pellyite
General Appearance of Type Material:
Grains to 2 mm.
Place of Conservation of Type Material:
University of British Columbia, Vancouver, Canada, S-79-21844; National Museum of Natural History, Washington, D.C., USA, 148587.
Geological Setting of Type Material:
Occurs in a contact metasomatic deposit adjacent to a porphyritic quartz monzonite stock; as a massive crystalline constituent of skarns which have developed in original limestone bodies adjacent to the igneous contact.
Associated Minerals at Type Locality:
Synonyms of Pellyite
Other Language Names for Pellyite
Varieties of Pellyite
Common Associates
Associations Based on Photo Data:
| 12 photos of Pellyite associated with Quartz | SiO2 |
| 9 photos of Pellyite associated with Sanbornite | BaSi2O5 |
| 8 photos of Pellyite associated with Gillespite | BaFe2+Si4O10 |
| 7 photos of Pellyite associated with Witherite | BaCO3 |
| 4 photos of Pellyite associated with Cerchiaraite-(Fe) | Ba4Fe3+4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl |
| 4 photos of Pellyite associated with Muirite | Ba10(Ca2Mn2+Ti)[Si8O24]O2Cl10 |
| 3 photos of Pellyite associated with Itsiite | Ba4Ca2[Si8B4O28]◻ |
| 3 photos of Pellyite associated with Ferrimuirite | Ba10(Ca2Fe3+2)[Si8O24]O2Cl10 |
| 2 photos of Pellyite associated with Titantaramellite | Ba4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx |
| 2 photos of Pellyite associated with Hedenbergite | CaFe2+Si2O6 |
Related Minerals - Strunz-mindat Grouping
| 9.DO. | Braccoite | NaMn2+5[Si5As5+O17(OH)](OH) |
| 9.DO. | Illoqite-(Ce) | Na2NaBaCeZnSi6O17 |
| 9.DO.05 | Pyroxferroite | (Fe,Mn,Ca)SiO3 |
| 9.DO.05 | Pyroxmangite | Mn2+SiO3 |
| 9.DO.15 | Manganonordite-(Ce) | Na3SrCeMn2+Si6O17 |
| 9.DO.15 | Ferronordite-(Ce) | Na3SrCeFe2+Si6O17 |
| 9.DO.15 | Nordite-(Ce) | (Ce,La)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17 |
| 9.DO.15 | Nordite-(La) | (La,Ce)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17 |
| 9.DO.15 | Ferronordite-(La) | Na3Sr(La,Ce)FeSi6O17 |
| 9.DO.15 | Meieranite | Na2Sr3MgSi6O17 |
| 9.DO.20 | Alamosite | PbSiO3 |
| 9.DO.25 | Liebauite | Ca3Cu5Si9O26 |
| 9.DO.30 | Vladykinite | Na3Sr4(Fe2+Fe3+)Si8O24 |
| 9.DO.30 | Rundqvistite-(Ce) | Na3(Sr3Ce)[Zn2Si8O24] |
Other Information
Thermal Behaviour:
Fuses at 3.
Notes:
Decomposes in dilute acid leaving a white residue.
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 Pellyite
mindat.org URL:
https://www.mindat.org/min-3145.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Pellyite
Reference List:
Montgomery, J. H.; Thompson, R. M.; Meagher, E. P. (1972) Pellyite: a new barium silicate mineral from the Yukon Territory. The Canadian Mineralogist, 11 (2). 444-447
Meagher, E. P. (1976) The atomic arrangement of pellyite: Ba2Ca(Fe,Mg)2Si6O17. American Mineralogist, 61 (1-2) 67-73
Localities for Pellyite
Showing 7 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.
Canada (TL) | |
| Montgomery et al. (1972) +4 other references |
Mexico | |
| Pabst et al. (1984) +2 other references |
USA | |
| [var: Manganese-bearing Pellyite] Pavel M. Kartashov analytical data 2018 |
| Walstrom (n.d.) +1 other reference | |
| Walstrom (n.d.) +5 other references | |
| Pabst et al. (1984) +1 other reference |
Quick NavTopAbout PellyiteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesVarietiesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Gun claim, Wilson Lake, Itsi Mountain, Watson Lake mining district, Yukon, Canada