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Pendevilleite-(Y)
A valid IMA mineral species
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About Pendevilleite-(Y)
Jean-Marie Pendeville
Formula:
Mg2Y3Al(UO2)2(CO3)7(OH)6(H2O)16
Colour:
whitish or greyish-white, locally pale-bluish white
Hardness:
2
Specific Gravity:
2.51 (Calculated)
Crystal System:
Triclinic
Name:
It is named after Jean-Marie Pendeville (1936–2002), a school teacher and an avid mineral lover and collector. He started with mineral collecting in 1967 and expanded it during his 28-year stay in Katanga (Democratic Republic of Congo, DRC). Pendeville had a curiosity for science and a profound gift for writing.
Type Locality:
New structure type. Unique combination of elements (status: October 2022).
Unique Identifiers
Mindat ID:
470410
Long-form identifier:
mindat:1:1:470410:8
IMA Classification of Pendevilleite-(Y)
Approved
IMA Formula:
Mg2Y3Al(U6+O2)2(CO3)7(OH)6(H2O)16
Approval year:
2022
Type description reference:
Classification of Pendevilleite-(Y)
5.ED.
5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
D : UO2:CO3 = 1:3
5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
D : UO2:CO3 = 1:3
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 |
|---|---|---|
| Pnv-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 Pendevilleite-(Y)
Colour:
Whitish or greyish-white, locally pale-bluish white
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}
{001}
Fracture:
Irregular/Uneven
Density:
2.51 g/cm3 (Calculated)
Chemistry of Pendevilleite-(Y)
Mindat Formula:
Mg2Y3Al(UO2)2(CO3)7(OH)6(H2O)16
Element Weights:
Crystallography of Pendevilleite-(Y)
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 11.9130(3) Å, b = 13.5252(11) Å, c = 16.1531(3) Å
α = 107.052(3)°, β = 92.7765(19)°, γ = 109.676(4)°
α = 107.052(3)°, β = 92.7765(19)°, γ = 109.676(4)°
Ratio:
a:b:c = 0.881 : 1 : 1.194
Unit Cell V:
2,311.45 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 15.24 Å | (100) |
| 11.45 Å | (26) |
| 10.23 Å | (39) |
| 8.33 Å | (36) |
| 8.03 Å | (29) |
| 7.18 Å | (24) |
| 6.82 Å | (19) |
| 6.35 Å | (33) |
Reference:
Comments:
Theoretical powder X-ray data (d in Å) for pendevilleite-(Y) based on the structure model obtained from the 3D ED data.
Type Occurrence of Pendevilleite-(Y)
General Appearance of Type Material:
occurs as extremely thin blades (up to about 0.08–0.10 mm in length and only about 1 μm thick), often forming lichen-like aggregates and crusts
Place of Conservation of Type Material:
Type material is deposited in the collections of the Musée National d’Histoire Naturelle, Rue Münster 25, Luxembourg 2160, Luxembourg, catalogue number VP230
Geological Setting of Type Material:
hydration–oxidation weathering of uraninite in the presence of solutions with dissolved CO2 that can originate from various sources
Associated Minerals at Type Locality:
Reference:
Synonyms of Pendevilleite-(Y)
Other Language Names for Pendevilleite-(Y)
Dutch:Pendevilleiet-(Y)
German:Pendevilleit-(Y)
Common Associates
Associations Based on Photo Data:
| 7 photos of Pendevilleite-(Y) associated with Kamotoite-(Y) | Y2(UO2)4(CO3)3O4 · 14H2O |
| 5 photos of Pendevilleite-(Y) associated with Shabaite-(Nd) | Nd2Ca[(UO2)(CO3)3](CO3)2(H2O)10.5 |
| 1 photo of Pendevilleite-(Y) associated with Masuyite | Pb(UO2)3O3(OH)2 · 3H2O |
| 1 photo of Pendevilleite-(Y) associated with Curite | Pb3(H2O)2[(UO2)4O4(OH)3]2 |
| 1 photo of Pendevilleite-(Y) associated with Uraninite | UO2 |
| 1 photo of Pendevilleite-(Y) associated with Astrocyanite-(Ce) | Cu2(Ce,Nd,La)2(UO2)(CO3)5(OH)2 · 1.5H2O |
Related Minerals - Strunz-mindat Grouping
| 5.ED. | Szilagyiite | NaCa3(UO2)(CO3)3(SeO3)F(H2O)6 |
| 5.ED. | Paramarkeyite | Ca2(UO2)(CO3)3 · 5H2O |
| 5.ED.05 | Bayleyite | Mg2(UO2)(CO3)3 · 18H2O |
| 5.ED.10 | Swartzite | MgCa(UO2)(CO3)3 · 12H2O |
| 5.ED.15 | Albrechtschraufite | Ca4Mg(UO2)2(CO3)6F2 · 17-18H2O |
| 5.ED.20 | Liebigite | Ca2(UO2)(CO3)3 · 11H2O |
| 5.ED.25 | Rabbittite | Ca3Mg3(UO2)2(CO3)6(OH)4 · 18H2O |
| 5.ED.30 | Andersonite | Na2Ca(UO2)(CO3)3 · 5.33H2O |
| 5.ED.35 | Grimselite | K3Na(UO2)(CO3)3 · H2O |
| 5.ED.40 | Widenmannite | Pb2(OH)2[(UO2)(CO3)2] |
| 5.ED.45 | Znucalite | Zn10Ca0.83(UO2)0.83(CO3)4(OH)15.31(H2O)5.48 |
| 5.ED.50 | Agricolaite | K4(UO2)(CO3)3 |
| 5.ED.50 | Čejkaite | Na4(UO2)(CO3)3 |
| 5.ED.55 | Línekite | K2Ca3[(UO2)(CO3)3]2 · 8H2O |
| 5.ED.55 | Braunerite | K2Ca(UO2)(CO3)3 · 6H2O |
| 5.ED.60 | Leószilárdite | Na6Mg(UO2)2(CO3)6 · 6H2O |
| 5.ED.65 | Pseudomarkeyite | Ca8(UO2)4(CO3)12 · 21H2O |
| 5.ED.65 | Natromarkeyite | Na2Ca8(UO2)4(CO3)13 · 27H2O |
| 5.ED.65 | Markeyite | Ca9(UO2)4(CO3)13 · 28H2O |
| 5.ED.70 | Paddlewheelite | MgCa5Cu2(UO2)4(CO3)12(H2O)33 |
Radioactivity
Radioactivity:
| Element | % Content | Activity (Bq/kg) | Radiation Type |
|---|---|---|---|
| Uranium (U) | 28.1239% | 7,030,975 | α, β, γ |
| Thorium (Th) | 0.0000% | 0 | α, β, γ |
| Potassium (K) | 0.0000% | 0 | β, γ |
For comparison:
- Banana: ~15 Bq per fruit
- Granite: 1,000–3,000 Bq/kg
- EU exemption limit: 10,000 Bq/kg
Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.
Interactive Simulator:
Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!
Activity: –
| Distance | Dose rate | Risk |
|---|---|---|
| 1 cm | ||
| 10 cm | ||
| 1 m |
The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).
D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield
Fluorescence of Pendevilleite-(Y)
Pendevilleite-(Y) is non-fluorescent in both SW and LW ultraviolet light.
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 Pendevilleite-(Y)
mindat.org URL:
https://www.mindat.org/min-470410.html
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References for Pendevilleite-(Y)
Localities for Pendevilleite-(Y)
Showing 1 localities.
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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.
DR Congo (TL) | |
| Miyawaki et al. (2022) +1 other reference |
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Kamoto East Open cut, Kamoto, Mutshatsha, Lualaba, DR Congo