Paraniite-(Y)
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Paraniite-(Y)
Formula:
Ca2Y(AsO4)(WO4)2
Colour:
Cream-yellow
Lustre:
Adamantine, Vitreous
Specific Gravity:
5.95 (Calculated)
Crystal System:
Tetragonal
Name:
Named by F. Demartin, C.M. Gramaccioli, and T. Pilati in 1992 in honor of Fausto Parani, amateur mineral collector from Montecrestese, Italy, who discovered the mineral. Demartin et al. (1992) suggests the name of paranite-(Y), but paraniite-(Y) was submitted to the IMA and used in Demartin et al. (1994). The suffix follows the Levinson rule for minerals with essential REE, denoting predominant yttrium.
This page provides mineralogical data about Paraniite-(Y).
Unique Identifiers
Mindat ID:
7215
Long-form identifier:
mindat:1:1:7215:7
Similar Names
| Parianite | A synonym of 'Bitumen' | |
| Parnauite | A valid IMA mineral species | Cu9(AsO4)2(SO4)(OH)10 · 7H2O |
| Pyreneite | A synonym of 'Melanite' |
IMA Classification of Paraniite-(Y)
Classification of Paraniite-(Y)
7.GA.15
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
A : Without additional anions or H2O
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
A : Without additional anions or H2O
49.4.7.1
49 : HYDRATED MOLYBDATES AND TUNGSTATES
4 : Compound Molybdates and Tungstates
49 : HYDRATED MOLYBDATES AND TUNGSTATES
4 : Compound Molybdates and Tungstates
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 |
|---|---|---|
| Prn-Y | 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 Paraniite-(Y)
Adamantine, Vitreous
Transparency:
Translucent
Colour:
Cream-yellow
Parting:
Uneven to subconchoidal parting (fracture?).
Density:
5.95 g/cm3 (Calculated)
Optical Data of Paraniite-(Y)
Type:
Uniaxial (+)
RI values:
nω = 1.87 nε = 1.92
Max. Birefringence:
δ = 0.050
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.
Chemistry of Paraniite-(Y)
Mindat Formula:
Ca2Y(AsO4)(WO4)2
Element Weights:
Crystallography of Paraniite-(Y)
Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
I41/a
Cell Parameters:
a = 5.135(1) Å, c = 33.882(5) Å
Ratio:
a:c = 1 : 6.598
Unit Cell V:
893.41 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Rough elongated bipyramids.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
|---|---|---|---|---|---|---|---|
| 0010274 | Paraniite-(Y) | Demartin F, Gramaccioli C M, Pilati T (1992) Structure of a new natural tungstate arsenate, [Ca2Y(AsO4)(WO4)2], structurally related to scheelite Acta Crystallographica C48 1357-1359 |  | 1992 | Alpine fissures, Pizzo Cervandone area, Ossola Valley, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.674 Å | (18) |
| 3.059 Å | (100) |
| 2.571 Å | (19) |
| 1.901 Å | (32) |
| 1.818 Å | (16) |
| 1.674 Å | (17) |
| 1.562 Å | (32) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Paraniite-(Y)
General Appearance of Type Material:
A single specimen. A few elongate, dipyramidal, tetragonal crystals up to 3 mm.
Place of Conservation of Type Material:
Museo di Centro Studi “P. Ginocchi”, Crodo, Italy.
Geological Setting of Type Material:
A fissure in gneiss.
Synonyms of Paraniite-(Y)
Other Language Names for Paraniite-(Y)
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 7.GA. | Yunhaoite | K2(MoO4) |
| 7.GA.05 | Ronpetersonite | BaWO4 |
| 7.GA.05 | Fergusonite-(Ce) | CeNbO4 · 0.3H2O |
| 7.GA.05 | 'Fergusonite-(Nd)' | NdNbO4 |
| 7.GA.05 | Fergusonite-(Y) | YNbO4 |
| 7.GA.05 | Powellite | Ca(MoO4) |
| 7.GA.05 | Stolzite | Pb(WO4) |
| 7.GA.05 | Suseinargiuite | NaBi(MoO4)2 |
| 7.GA.05 | Wulfenite | Pb(MoO4) |
| 7.GA.05 | Scheelite | Ca(WO4) |
| 7.GA.10 | Formanite-(Y) | YTaO4 |
| 7.GA.10 | Iwashiroite-(Y) | Y(Ta,Nb)O4 |
| 7.GA.20 | Takanawaite-(Y) | YTaO4 |
Fluorescence of Paraniite-(Y)
Moderately strong yellow-orange fluorescence under SW UV. Not fluorescent at 366 nm.
Other Information
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 Paraniite-(Y)
mindat.org URL:
https://www.mindat.org/min-7215.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Paraniite-(Y)
Reference List:
Demartin, F., Gramaccioli, C. M., Pilati, T. (1992) Structure of a new natural tungstate arsenate, [Ca2Y(AsO4)(WO4)2], structurally related to scheelite. Acta Crystallographica Section C Crystal Structure Communications, 48 (7) 1357-1359 doi:10.1107/s0108270192003688
Localities for Paraniite-(Y)
Showing 4 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.
Italy | |
| Bracco et al. (2009) |
| Demartin et al. (1994) +2 other references |
Switzerland | |
| Brugger et al. (1998) |
| Roth et al. (2013) |
Quick NavTopAbout Paraniite-(Y)Unique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Costa Balzi Rossi, Magliolo, Savona Province, Liguria, Italy