Naldrettite
A valid IMA mineral species
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About Naldrettite
Formula:
Pd2Sb
Lustre:
Metallic
Hardness:
4 - 5
Specific Gravity:
10.694 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Anthony James Naldrett (23 June 1933, England - 21 June 2020), University of Toronto, who made significant contributions to the understanding of the genesis of platinum-group element deposits. He served as President of both the Mineralogical Association of Canada and the International Mineralogical Association.
Unique Identifiers
Mindat ID:
27202
Long-form identifier:
mindat:1:1:27202:9
GUID
(UUID V4):
(UUID V4):
384a2686-3f6a-42fc-b864-d27cce05c88c
IMA Classification of Naldrettite
Approved
Approval year:
2004
First published:
2005
Type description reference:
Cabri, L. J., McDonald, A. M., Stanley, C. J., Rudashevsky, N. S., Poirier, G., Durham, B. R., Mungall, J. E., Rudashevsky, V. N. (2005) Naldrettite, Pd2Sb, a new intermetallic mineral from the Mesamax Northwest deposit, Ungava region, Québec, Canada. Mineralogical Magazine, 69 (1) 89-97 doi:10.1180/0026461056910236
Classification of Naldrettite
2.AC.25d
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
C : Alloys of metalloids with PGE
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
C : Alloys of metalloids with PGE
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 |
---|---|---|
Nld | 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 Naldrettite
Metallic
Transparency:
Opaque
Hardness:
4 - 5 on Mohs scale
Hardness:
VHN50=358 - 418 kg/mm2 - Vickers
Tenacity:
Elastic
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
10.694(1) g/cm3 (Calculated)
Optical Data of Naldrettite
Anisotropism:
Distinct, deep bright blue, lemon-buff, mauve to pale pink
Bireflectance:
Weak
Reflectivity:
Wavelength | R1 | R2 | imR1 | imR2 |
---|---|---|---|---|
400nm | 44.5% | 46.3% | 32.0% | 33.8% |
420nm | 45.9% | 47.7% | 33.1% | 34.8% |
440nm | 47.1% | 49.0% | 34.2% | 35.8% |
460nm | 48.3% | 50.2% | 35.4% | 37.0% |
470nm | 49.0% | 50.9% | 35.9% | 37.6% |
480nm | 49.7% | 51.5% | 36.4% | 38.3% |
500nm | 50.8% | 52.6% | 37.6% | 39.5% |
520nm | 51.9% | 53.7% | 39.0% | 40.7% |
540nm | 53.0% | 54.8% | 40.1% | 41.9% |
546nm | 53.2% | 55.1% | 40.3% | 42.1% |
560nm | 53.8% | 55.8% | 40.9% | 42.8% |
580nm | 54.9% | 57.1% | 42.0% | 43.8% |
589nm | 55.4% | 57.5% | 42.5% | 44.3% |
600nm | 56.0% | 58.0% | 43.0% | 44.8% |
620nm | 57.2% | 59.0% | 44.0% | 45.8% |
640nm | 58.1% | 59.7% | 45.0% | 46.8% |
650nm | 58.5% | 60.1% | 45.4% | 47.2% |
660nm | 58.9% | 60.5% | 45.8% | 47.7% |
680nm | 59.6% | 61.1% | 46.5% | 48.4% |
700nm | 60.5% | 62.0% | 47.2% | 49.2% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 62.0%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Colour in reflected light:
Bright creamy white
Pleochroism:
Non-pleochroic
Chemistry of Naldrettite
Mindat Formula:
Pd2Sb
Elements listed:
Crystallography of Naldrettite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Cmc21
Cell Parameters:
a = 3.3906 Å, b = 17.5551 Å, c = 6.957 Å
Ratio:
a:b:c = 0.193 : 1 : 0.396
Unit Cell V:
414.10 ų (Calculated from Unit Cell)
Morphology:
Anhedral grains
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.407 Å | (34) |
2.303 Å | (35) |
2.245 Å | (100) |
2.057 Å | (52) |
2.001 Å | (40) |
1.367 Å | (35) |
1.284 Å | (42) |
1.212 Å | (50) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
37 : Layered igneous intrusions and related PGE minerals |
Type Occurrence of Naldrettite
General Appearance of Type Material:
Anhedral grains, commonly attached or moulded to sulphide minerals, and also associated with clinochlore. Grains vary in size from ~10 to 239 µm (avg 74 µm).
Place of Conservation of Type Material:
Natural History Museum, London, England (BM 2004,34).
Canadian Museum of Nature, Ottawa, Canada (CNMMN 84397).
Canadian Museum of Nature, Ottawa, Canada (CNMMN 84397).
Geological Setting of Type Material:
Separation of heavy platinum-group mineral particles. Disseminated to net-textured sulphide mineralization hosted by amphibolite and serpentinite replacing pyroxenite and peridotite.
Associated Minerals at Type Locality:
Reference:
Cabri, L.J., McDonald, A.M., Stanley, C.J., Rudashevsky, N.S., Poirier, G., Durham, B.R., Mungall, J.E. and Rudashevsky, V.N. (2005) Naldrettite, Pd2Sb, a new intermetallic mineral from the Mesamax Northwest deposit, Ungava region, Quebec, Canada. Mineralogical Magazine: 69: 89-97.
Synonyms of Naldrettite
Other Language Names for Naldrettite
Simplified Chinese:一锑二钯矿
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Naldrettite associated with Chalcopyrite | CuFeS2 |
Related Minerals - Strunz-mindat Grouping
2.AC. | Törnroosite | Pd11As2Te2 |
2.AC. | Vadlazarenkovite | Pd8Bi1.5Te1.25As0.25 |
2.AC.05a | Atheneite | Pd2As0.75Hg0.25 |
2.AC.05b | Vincentite | Pd3As |
2.AC.10c | Arsenopalladinite | Pd8(As,Sb)3 |
2.AC.10b | Mertieite | Pd8Sb2.5As0.5 |
2.AC.10a | Stillwaterite | Pd8As3 |
2.AC.15a | Isomertieite | Pd11Sb2As2 |
2.AC.15b | Pseudomertieite | Pd11(Sb,As)4 |
2.AC.15a | Miessiite | Pd11Te2Se2 |
2.AC.20b | Palarstanide | Pd5(Sn,As)2 |
2.AC.20a | Stibiopalladinite | Pd5Sb2 |
2.AC.20c | Menshikovite | Pd3Ni2As3 |
2.AC.25e | Majakite | PdNiAs |
2.AC.25a | Palladoarsenide | Pd2As |
2.AC.25f | Palladobismutharsenide | Pd2(As,Bi) |
2.AC.25c | Palladodymite | (Pd,Rh)2As |
2.AC.25b | Rhodarsenide | (Rh,Pd)2As |
2.AC.30 | UM1999-02-As:NiRh | (Rh,Ni)7As4 |
2.AC.30 | Polkanovite | Rh12As7 |
2.AC.35a | Genkinite | Pt4Sb3 |
2.AC.35b | Ungavaite | Pd4Sb3 |
2.AC.40 | Polarite | Pd(Bi,Pb) |
2.AC.45a | Froodite | α-PdBi2 |
2.AC.50 | Nipalarsite | Ni8Pd3As4 |
2.AC.50 | Viteite | Pd5InAs |
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 Naldrettite
mindat.org URL:
https://www.mindat.org/min-27202.html
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References for Naldrettite
Reference List:
Cabri, L. J., McDonald, A. M., Stanley, C. J., Rudashevsky, N. S., Poirier, G., Durham, B. R., Mungall, J. E., Rudashevsky, V. N. (2005) Naldrettite, Pd2Sb, a new intermetallic mineral from the Mesamax Northwest deposit, Ungava region, Québec, Canada. Mineralogical Magazine, 69 (1) 89-97 doi:10.1180/0026461056910236
Localities for Naldrettite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Australia | |
| Johan et al. (1989) +1 other reference |
Brazil | |
| Vandenbroucke Museum |
Canada | |
| Robert C. Smith |
| Mcdonald et al. (2015) |
| Good et al. (2017) |
| Liu et al. (2016) |
Cabri et al. (2005) +2 other references | |
Liu et al. (2016) | |
China | |
| Xiaoqiang Hu et al. (2001) +1 other reference |
Greece | |
| Katie A. McFall et al. (2018) |
| Argyrios Kapsiotis et al. (2010) |
Greenland | |
| Rudashevsky et al. (2023) |
North Macedonia | |
| Đorđević et al. (2017) |
Russia | |
| Ariskin et al. (2016) |
Spiridonov et al. (2018) | |
| Shvedov et al. (2017) +1 other reference |
| Spiridonov et al. (2020) +1 other reference |
South Africa | |
| Hutchinson et al. (2005) |
Hutchinson et al. (2005) | |
UK | |
| Graham et al. (2017) |
USA | |
| Smith and Barnes (2011) |
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Mesamax Northwest deposit, Ungava Peninsula, Nunavik, Nord-du-Québec, Québec, Canada