OREAS 473

OREAS 473 is a certified reference material (CRM) produced from a blend of clay-hosted rare earth element (REE) ores and barren 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) 12.0 0.66 11.3 12.6 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (ppm) 242 11 232 252 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 71 2.3 69 74 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 2.56 0.135 2.41 2.71 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 22.95 0.730 22.40 23.50 Borate / Peroxide Fusion ICP
Ba, Barium (wt.%) 0.405 0.012 0.393 0.417 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 3.11 0.233 2.88 3.34 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 0.43 0.05 0.35 0.51 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.911 0.050 0.851 0.971 Borate / Peroxide Fusion ICP
CeO2, Cerium(IV) oxide (ppm) 655 23 633 677 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 15.8 0.72 14.7 16.9 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 66 4.1 62 70 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 10.7 0.55 10.1 11.3 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 65 10 54 76 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 5.44 0.213 5.14 5.73 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 7.34 0.414 6.99 7.69 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 10.02 0.226 9.77 10.26 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 30.9 1.93 28.8 32.9 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 21.9 1.37 21.0 22.7 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 12.4 0.50 11.8 13.1 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 2.09 0.100 1.98 2.20 Borate / Peroxide Fusion ICP
In, Indium (ppm) < 0.20 IND IND IND Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 3.66 0.090 3.56 3.75 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (ppm) 306 11 298 315 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 17.3 1.22 15.9 18.8 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 0.66 0.045 0.60 0.73 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.33 0.043 1.30 1.37 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.058 0.002 0.056 0.060 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 2.19 0.33 1.94 2.43 Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 0.937 0.027 0.902 0.971 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 20.3 1.80 19.0 21.5 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 38.7 4.4 31.9 45.4 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.614 0.025 0.587 0.640 Borate / Peroxide Fusion ICP
Pb, Lead (ppm) 48.0 3.08 45.0 51.0 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 147 6 142 152 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 0.048 0.008 0.033 0.063 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 1.20 0.20 0.96 1.44 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 22.3 1.65 20.9 23.8 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 48.96 1.469 47.28 50.64 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 34.9 1.34 33.7 36.2 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 5.06 0.56 4.41 5.71 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 727 31 704 750 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 1.22 0.120 1.08 1.36 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 30.7 1.42 29.4 31.9 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 1.06 0.057 1.01 1.10 Borate / Peroxide Fusion ICP
Tl, Thallium (ppm) 0.88 0.076 0.76 1.00 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 0.73 0.042 0.66 0.80 Borate / Peroxide Fusion ICP
TREO, Total Rare Earth Oxides (ppm) 1373 28 1331 1415 Borate / Peroxide Fusion ICP
TREO+Y2O3, Total Rare Earth Oxides + Yttrium oxide (ppm) 1433 36 1393 1473 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 3.90 0.184 3.70 4.09 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 175 15 164 186 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 4.66 0.397 4.04 5.27 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 64 2.7 62 67 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 4.47 0.177 4.22 4.73 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 110 7 101 118 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 520 29 499 541 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 22.92 0.386 22.60 23.24 Borate Fusion XRF
BaO, Barium oxide (wt.%) 0.448 0.024 0.426 0.469 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.915 0.026 0.895 0.936 Borate Fusion XRF
CeO2, Cerium(IV) oxide (ppm) 664 73 600 728 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.%) 10.10 0.171 9.97 10.23 Borate Fusion XRF
Gd2O3, Gadolinium(III) oxide (ppm) 74 68 23 126 Borate Fusion XRF
Ho2O3, Holmium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 3.63 0.052 3.59 3.68 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (ppm) 344 57 251 437 Borate Fusion XRF
Lu2O3, Lutetium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 1.34 0.022 1.31 1.36 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.056 0.006 0.050 0.062 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.952 0.055 0.909 0.994 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.617 0.025 0.596 0.637 Borate Fusion XRF
Pr6O11, Praseodymium(III,IV) oxide (ppm) 85 19 63 107 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 48.36 0.851 47.68 49.05 Borate Fusion XRF
Sm2O3, Samarium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 0.093 0.010 0.079 0.107 Borate Fusion XRF
Tb4O7, Terbium(III,IV) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 1.76 0.037 1.73 1.79 Borate Fusion XRF
Tm2O3, Thulium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 316 53 258 375 Borate Fusion XRF
Yb2O3, Ytterbium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
ZnO, Zinc oxide (ppm) 153 33 118 189 Borate Fusion XRF
ZrO2, Zirconium dioxide (ppm) 670 46 610 730 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 7.68 0.577 7.35 8.02 Thermogravimetry
Al, Aluminium (wt.%) 11.64 0.467 11.17 12.11 4-Acid Digestion
Ba, Barium (wt.%) 0.407 0.009 0.395 0.418 4-Acid Digestion
Be, Beryllium (ppm) 2.97 0.159 2.83 3.11 4-Acid Digestion
Bi, Bismuth (ppm) 0.40 0.025 0.38 0.43 4-Acid Digestion
Ca, Calcium (wt.%) 0.638 0.027 0.615 0.662 4-Acid Digestion
Ce, Cerium (ppm) 512 38 486 538 4-Acid Digestion
Co, Cobalt (ppm) 15.8 0.77 15.2 16.4 4-Acid Digestion
Cr, Chromium (ppm) 56 4.6 53 59 4-Acid Digestion
Cs, Caesium (ppm) 10.5 0.54 10.0 11.0 4-Acid Digestion
Cu, Copper (ppm) 61 2.3 59 63 4-Acid Digestion
Dy, Dysprosium (ppm) 10.1 0.66 9.6 10.6 4-Acid Digestion
Er, Erbium (ppm) 4.58 0.332 4.31 4.86 4-Acid Digestion
Eu, Europium (ppm) 6.13 0.361 5.78 6.48 4-Acid Digestion
Fe, Iron (wt.%) 6.78 0.214 6.59 6.98 4-Acid Digestion
Ga, Gallium (ppm) 31.1 1.99 29.5 32.7 4-Acid Digestion
Gd, Gadolinium (ppm) 18.7 2.3 17.3 20.1 4-Acid Digestion
Hf, Hafnium (ppm) 5.90 0.512 5.49 6.31 4-Acid Digestion
Ho, Holmium (ppm) 1.71 0.125 1.59 1.83 4-Acid Digestion
In, Indium (ppm) 0.10 0.006 0.10 0.11 4-Acid Digestion
K, Potassium (wt.%) 2.96 0.114 2.84 3.07 4-Acid Digestion
La, Lanthanum (ppm) 241 37 222 260 4-Acid Digestion
Li, Lithium (ppm) 16.8 0.58 16.2 17.4 4-Acid Digestion
Lu, Lutetium (ppm) 0.53 0.043 0.49 0.57 4-Acid Digestion
Mg, Magnesium (wt.%) 0.742 0.036 0.709 0.774 4-Acid Digestion
Mn, Manganese (wt.%) 0.042 0.002 0.041 0.044 4-Acid Digestion
Mo, Molybdenum (ppm) 2.25 0.097 2.10 2.39 4-Acid Digestion
Na, Sodium (wt.%) 0.695 0.024 0.674 0.716 4-Acid Digestion
Nb, Niobium (ppm) 19.3 1.16 18.3 20.3 4-Acid Digestion
Nd, Neodymium (ppm) 202 21 185 219 4-Acid Digestion
Ni, Nickel (ppm) 38.2 1.31 36.8 39.5 4-Acid Digestion
P, Phosphorus (wt.%) 0.268 0.011 0.257 0.278 4-Acid Digestion
Pb, Lead (ppm) 47.2 2.17 45.2 49.2 4-Acid Digestion
Pr, Praseodymium (ppm) 58 4.5 54 62 4-Acid Digestion
Rb, Rubidium (ppm) 141 13 128 154 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.041 0.002 0.039 0.043 4-Acid Digestion
Sb, Antimony (ppm) 1.26 0.067 1.19 1.33 4-Acid Digestion
Sc, Scandium (ppm) 21.4 1.29 20.5 22.3 4-Acid Digestion
Sm, Samarium (ppm) 29.4 1.46 27.8 31.0 4-Acid Digestion
Sn, Tin (ppm) 4.74 0.200 4.51 4.98 4-Acid Digestion
Sr, Strontium (ppm) 701 30 673 730 4-Acid Digestion
Ta, Tantalum (ppm) 1.09 0.093 1.02 1.16 4-Acid Digestion
Tb, Terbium (ppm) 2.07 0.174 1.92 2.22 4-Acid Digestion
Th, Thorium (ppm) 30.1 2.93 27.6 32.5 4-Acid Digestion
Ti, Titanium (wt.%) 0.976 0.065 0.934 1.017 4-Acid Digestion
Tl, Thallium (ppm) 0.85 0.077 0.80 0.90 4-Acid Digestion
Tm, Thulium (ppm) 0.59 0.051 0.55 0.63 4-Acid Digestion
U, Uranium (ppm) 3.58 0.235 3.37 3.79 4-Acid Digestion
V, Vanadium (ppm) 169 8 162 176 4-Acid Digestion
W, Tungsten (ppm) 4.17 0.243 3.92 4.42 4-Acid Digestion
Y, Yttrium (ppm) 46.0 4.7 43.4 48.7 4-Acid Digestion
Yb, Ytterbium (ppm) 3.66 0.251 3.42 3.90 4-Acid Digestion
Zn, Zinc (ppm) 107 3 103 110 4-Acid Digestion
Zr, Zirconium (ppm) 244 21 229 258 4-Acid Digestion
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