OREAS 472

OREAS 472 is a certified reference material (CRM) produced from a blend of clay-hosted rare earth element (REE) ores, mudstone, silica and kaolin. The REE-bearing ores were sourced from the Jupiter deposit in the Laverton region of Western Australia.
Mineralisation occurs within a deeply weathered regolith developed over an underlying carbonatite–alkaline volcanic sequence. Supergene processes have resulted in enrichment of total rare earth oxides (TREO), including a significant proportion of magnet rare earth oxides (MREO), notably neodymium and praseodymium, with subordinate dysprosium and terbium. The CRM matrix is quartz-rich and comprises abundant mica–illite and kaolinite-group clays, with additional smectite/vermiculite-type clay minerals. Minor iron oxides (goethite and magnetite), traces of hematite and anatase are present as accessory phases. Rare earth elements are interpreted to occur predominantly within fine-grained secondary phases associated with the clay fraction.

Twenty-nine commercial analytical laboratories participated in the program to certify the elements reported below using the following methods:

  • Lithium borate or sodium peroxide fusion with full suite ICP-OES and ICP-MS elemental package
  • Thermogravimetric LOI at 1000 °C
  • Borate/Peroxide Fusion – Full ICP-OES and MS elemental suites
  • 4-Acid – Full ICP-OES and MS elemental suites

Homogeneity was evaluated using 12 subsamples analysed by oxidising fusion with lithium borate fusion with ICP-MS finish. ANOVA was applied to duplicates from six test units to compare within- and between-unit variances, providing a statistical measure of batch homogeneity.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Dy2O3, Dysprosium(III) oxide (ppm) 8.15 0.456 7.72 8.58 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (ppm) 144 5 138 149 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 41.6 1.67 40.1 43.1 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 1.66 0.101 1.55 1.77 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 17.60 0.585 17.01 18.19 Borate / Peroxide Fusion ICP
Ba, Barium (wt.%) 0.360 0.012 0.351 0.368 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 2.17 0.41 1.91 2.43 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 0.28 0.07 0.19 0.37 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 1.86 0.063 1.81 1.90 Borate / Peroxide Fusion ICP
CeO2, Cerium(IV) oxide (ppm) 380 13 369 391 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 21.1 0.89 20.0 22.1 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 65 3.3 60 71 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 5.57 0.285 5.26 5.88 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 48.6 9.2 41.0 56.2 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 3.76 0.166 3.52 4.00 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 4.61 0.272 4.38 4.85 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 8.51 0.155 8.31 8.71 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 23.5 1.41 22.2 24.8 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 13.9 0.82 13.0 14.8 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 9.75 0.427 9.26 10.24 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 1.42 0.082 1.32 1.51 Borate / Peroxide Fusion ICP
In, Indium (ppm) < 0.20 IND IND IND Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 3.56 0.091 3.47 3.65 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (ppm) 177 6 171 184 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 15.2 2.6 12.4 17.9 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 0.46 0.026 0.42 0.50 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.74 0.035 1.69 1.78 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.070 0.001 0.068 0.071 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 2.44 0.47 2.10 2.78 Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 1.50 0.034 1.46 1.54 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 15.0 0.91 14.3 15.6 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 43.6 4.5 35.3 51.8 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.558 0.022 0.532 0.584 Borate / Peroxide Fusion ICP
Pb, Lead (ppm) 37.5 4.0 34.1 41.0 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 122 5 116 127 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 0.047 0.007 0.036 0.059 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 16.6 1.10 15.1 18.1 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 57.49 0.840 56.33 58.65 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 21.4 0.95 20.1 22.8 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 3.50 0.50 2.75 4.25 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 692 23 676 709 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 0.91 0.10 0.79 1.03 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 22.7 1.08 21.7 23.7 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.758 0.033 0.735 0.781 Borate / Peroxide Fusion ICP
Tl, Thallium (ppm) 0.75 0.09 0.64 0.86 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 0.49 0.041 0.45 0.53 Borate / Peroxide Fusion ICP
TREO, Total Rare Earth Oxides (ppm) 803 23 779 826 Borate / Peroxide Fusion ICP
TREO+Y2O3, Total Rare Earth Oxides + Yttrium oxide (ppm) 845 25 821 870 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 3.01 0.158 2.86 3.17 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 138 10 132 144 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 3.58 0.301 3.14 4.02 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 43.2 1.66 41.7 44.7 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 3.08 0.178 2.87 3.29 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 108 8 100 116 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 403 20 388 417 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 17.43 0.329 17.19 17.67 Borate Fusion XRF
BaO, Barium oxide (wt.%) 0.398 0.023 0.376 0.420 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 1.85 0.029 1.82 1.88 Borate Fusion XRF
CeO2, Cerium(IV) oxide (ppm) 364 67 248 481 Borate Fusion XRF
Dy2O3, Dysprosium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
Eu2O3, Europium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 8.52 0.142 8.41 8.63 Borate Fusion XRF
Gd2O3, Gadolinium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
Ho2O3, Holmium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 3.52 0.051 3.47 3.56 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (ppm) 208 35 185 232 Borate Fusion XRF
Lu2O3, Lutetium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 1.73 0.028 1.70 1.75 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.068 0.004 0.064 0.072 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 1.53 0.043 1.50 1.57 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.562 0.024 0.542 0.581 Borate Fusion XRF
Pr6O11, Praseodymium(III,IV) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 57.23 0.805 56.56 57.89 Borate Fusion XRF
Sm2O3, Samarium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 0.099 0.012 0.080 0.118 Borate Fusion XRF
Tb4O7, Terbium(III,IV) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 1.28 0.027 1.25 1.30 Borate Fusion XRF
Tm2O3, Thulium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 255 40 214 296 Borate Fusion XRF
Yb2O3, Ytterbium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
ZnO, Zinc oxide (ppm) 160 28 130 190 Borate Fusion XRF
ZrO2, Zirconium dioxide (ppm) 510 50 382 638 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 5.09 0.60 4.76 5.42 Thermogravimetry
Al, Aluminium (wt.%) 9.01 0.269 8.79 9.23 4-Acid Digestion
Ba, Barium (wt.%) 0.362 0.009 0.352 0.372 4-Acid Digestion
Be, Beryllium (ppm) 2.24 0.120 2.13 2.35 4-Acid Digestion
Bi, Bismuth (ppm) 0.24 0.016 0.23 0.26 4-Acid Digestion
Ca, Calcium (wt.%) 1.31 0.042 1.26 1.35 4-Acid Digestion
Ce, Cerium (ppm) 308 19 295 321 4-Acid Digestion
Co, Cobalt (ppm) 21.2 0.82 20.3 22.1 4-Acid Digestion
Cr, Chromium (ppm) 56 4.0 53 59 4-Acid Digestion
Cs, Caesium (ppm) 5.65 0.218 5.40 5.90 4-Acid Digestion
Cu, Copper (ppm) 48.5 1.99 46.8 50.3 4-Acid Digestion
Dy, Dysprosium (ppm) 6.98 0.447 6.66 7.30 4-Acid Digestion
Er, Erbium (ppm) 3.19 0.201 3.00 3.39 4-Acid Digestion
Eu, Europium (ppm) 4.04 0.301 3.83 4.25 4-Acid Digestion
Fe, Iron (wt.%) 5.76 0.122 5.59 5.93 4-Acid Digestion
Ga, Gallium (ppm) 23.3 1.18 22.4 24.3 4-Acid Digestion
Gd, Gadolinium (ppm) 12.1 0.88 11.5 12.7 4-Acid Digestion
Hf, Hafnium (ppm) 4.92 0.419 4.57 5.26 4-Acid Digestion
Ho, Holmium (ppm) 1.20 0.046 1.15 1.26 4-Acid Digestion
In, Indium (ppm) 0.074 0.007 0.065 0.083 4-Acid Digestion
K, Potassium (wt.%) 2.91 0.087 2.83 3.00 4-Acid Digestion
La, Lanthanum (ppm) 150 9 143 158 4-Acid Digestion
Li, Lithium (ppm) 14.6 0.62 14.1 15.2 4-Acid Digestion
Lu, Lutetium (ppm) 0.39 0.016 0.37 0.41 4-Acid Digestion
Mg, Magnesium (wt.%) 0.987 0.033 0.955 1.020 4-Acid Digestion
Mn, Manganese (wt.%) 0.052 0.002 0.051 0.054 4-Acid Digestion
Mo, Molybdenum (ppm) 2.16 0.085 2.05 2.26 4-Acid Digestion
Na, Sodium (wt.%) 1.11 0.027 1.08 1.14 4-Acid Digestion
Nb, Niobium (ppm) 14.5 0.76 13.9 15.2 4-Acid Digestion
Nd, Neodymium (ppm) 121 9 114 127 4-Acid Digestion
Ni, Nickel (ppm) 42.3 1.25 40.9 43.8 4-Acid Digestion
P, Phosphorus (wt.%) 0.246 0.008 0.237 0.255 4-Acid Digestion
Pb, Lead (ppm) 35.0 1.52 33.5 36.4 4-Acid Digestion
Pr, Praseodymium (ppm) 35.1 2.13 33.4 36.8 4-Acid Digestion
Rb, Rubidium (ppm) 122 11 115 128 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.046 0.004 0.040 0.053 4-Acid Digestion
Sb, Antimony (ppm) 0.61 0.042 0.57 0.65 4-Acid Digestion
Sc, Scandium (ppm) 16.4 0.86 15.5 17.3 4-Acid Digestion
Sm, Samarium (ppm) 18.2 1.12 17.3 19.1 4-Acid Digestion
Sn, Tin (ppm) 3.43 0.166 3.25 3.61 4-Acid Digestion
Sr, Strontium (ppm) 691 18 669 712 4-Acid Digestion
Ta, Tantalum (ppm) 0.88 0.086 0.82 0.93 4-Acid Digestion
Tb, Terbium (ppm) 1.40 0.084 1.31 1.49 4-Acid Digestion
Th, Thorium (ppm) 23.3 1.17 22.1 24.5 4-Acid Digestion
Ti, Titanium (wt.%) 0.733 0.034 0.705 0.760 4-Acid Digestion
Tl, Thallium (ppm) 0.74 0.058 0.70 0.78 4-Acid Digestion
Tm, Thulium (ppm) 0.41 0.033 0.38 0.44 4-Acid Digestion
U, Uranium (ppm) 2.80 0.186 2.65 2.96 4-Acid Digestion
V, Vanadium (ppm) 135 5 130 140 4-Acid Digestion
W, Tungsten (ppm) 3.27 0.161 3.09 3.45 4-Acid Digestion
Y, Yttrium (ppm) 32.1 2.92 30.2 33.9 4-Acid Digestion
Yb, Ytterbium (ppm) 2.56 0.142 2.41 2.70 4-Acid Digestion
Zn, Zinc (ppm) 105 4 102 109 4-Acid Digestion
Zr, Zirconium (ppm) 205 16 196 215 4-Acid Digestion
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