Naldrettite
A valid IMA mineral species
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About Naldrettite
Anthony J. Naldrett
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
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 for Standard |
|---|---|---|
| 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). 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) |
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
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? 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., 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
Synonyms of Naldrettite
Other Language Names for Naldrettite
Common Associates
Associations Based on Photo Data:
| 1 photo of Naldrettite associated with Native Gold | Au |
| 1 photo of Naldrettite associated with Chalcopyrite | CuFeS2 |
Related Minerals - Strunz-mindat Grouping
| 2.AC. | Vadlazarenkovite | Pd8Bi1.5Te1.25As0.25 |
| 2.AC. | Törnroosite | Pd11As2Te2 |
| 2.AC.05b | Vincentite | Pd3As |
| 2.AC.05a | Atheneite | Pd2As0.75Hg0.25 |
| 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.15a | Miessiite | Pd11Te2Se2 |
| 2.AC.15b | Pseudomertieite | Pd11(Sb,As)4 |
| 2.AC.20c | Menshikovite | Pd3Ni2As3 |
| 2.AC.20a | Stibiopalladinite | Pd5Sb2 |
| 2.AC.20b | Palarstanide | Pd5(Sn,As)2 |
| 2.AC.25c | Palladodymite | (Pd,Rh)2As |
| 2.AC.25b | Rhodarsenide | (Rh,Pd)2As |
| 2.AC.25e | Majakite | PdNiAs |
| 2.AC.25a | Palladoarsenide | Pd2As |
| 2.AC.25f | Palladobismutharsenide | Pd2(As,Bi) |
| 2.AC.30 | 'UM1999-02-As:NiRh' | (Rh,Ni)7As4 |
| 2.AC.30 | Polkanovite | Rh12As7 |
| 2.AC.35b | Ungavaite | Pd4Sb3 |
| 2.AC.35a | Genkinite | Pt4Sb3 |
| 2.AC.40 | Polarite | Pd(Bi,Pb) |
| 2.AC.45a | Froodite | α-PdBi2 |
| 2.AC.50 | Viteite | Pd5InAs |
| 2.AC.50 | Nipalarsite | Ni8Pd3As4 |
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:
Bälz, U., Schubert, K. (1969) Kristallstruktur von Pd2As(r) und Pd2Sb. Journal of the Less Common Metals, 19 (3). 300-304 doi:10.1016/0022-5088(69)90111-8
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
Showing 24 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.
Australia | |
| Johan et al. (1989) +1 other reference |
Brazil | |
| Vandenbroucke Museum |
| Campo Rodriguez et al. (2024) |
Canada | |
| Robert C. Smith II Ph.D. P.G. |
| 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 |
Ecuador | |
| Barron et al. (2025) |
Greece | |
| McFall et al. (2018) |
| 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 |
| Kutyrev et al. (2023) |
| 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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Itabira, Minas Gerais, Brazil