U.S. Geological Survey Geochemical Reference Materials and Certificates
U.S. Geological Survey
Certificate of Analysis
Material for this standard was collected in 1965 by Dr. David P. Gold at the St. Lawrence Columbium and Metals Corporation Ltd. Oka complex. The collection site is located approximately 20 miles west of Montreal, Canada on the north shore of the Lake of Two Mountains. The age of the Oka complex is indicated as 100±15 million years and is composed primarily of ultramafic alkaline and carbonate rocks. At the time of collection, the site was the world's largest single producer of niobium.
Analytical results reported here are for information purposes only. Reported values are based results from only one or two laboratories or independent techniques. The data has not been subjected to a rigorous statistical analysis, and therefore should be used with caution.
Information Values | Certificate Information | Order and Pricing Information
| Oxide | Wt% | ± | Oxide | Wt% | ± | |
|---|---|---|---|---|---|---|
| Al2O3 | 0.37 | 0.04 | Na2O | <0.1 | — | |
| SiO2 | 3.47 | 0.11 | K2O | 0.16 | 0.02 | |
| Fe2O3T | 2.94 | 0.09 | TiO2 | 0.15 | 0.002 | |
| MgO | 1.25 | 0.03 | P2O5 | 2.6 | 0.12 | |
| CaO | 48.3 | 0.38 | MnO | 0.43 | 0.002 |
| Element | ppm | ± | Element | ppm | ± | |
|---|---|---|---|---|---|---|
| Ba | 1000 | <100 | Nb | 3900 | 60 | |
| Be | 1.2 | 0.6 | Nd | 480 | 15 | |
| Ce | 1700 | 0 | Ni | 13 | 1 | |
| Co | <5 | — | Pr | 150 | 6 | |
| Cr | <10 | — | Sc | 3 | 0.1 | |
| Cs | 0.2 | 0.01 | Sm | 56 | 2 | |
| Cu | <10 | — | Sr | 12000 | <100 | |
| Dy | 18 | — | Tb | 4 | 0.1 | |
| Er | 7 | 0.06 | Th | 10 | 1 | |
| Eu | 15 | 0.6 | U | 11 | 0.6 | |
| Ga | 6 | 0.2 | V | 110 | 6 | |
| Gd | 50 | 1 | Y | 81 | 5 | |
| Ho | 3 | 0.1 | Yb | 6 | 0.5 | |
| La | 750 | 10 | Zn | 87 | 1.5 | |
| Zr | 65 | 3 | ||||
Denver, Colorado
April 3, 1995
Dr. Geoff Plumlee
U.S. Geological Survey
Central Region Mineral Resources Team
USGS reference materials (RMs) may be obtained directly from Dr. Stephen A. Wilson. The price for each bottle of RM is $80.00 (U.S. dollars) except DGPM-1, which is $175.00 (U.S. dollars). For domestic orders, this cost includes all shipping and handling charges using normal mail delivery. For foreign orders, delivery charges will be added to the final bill. Urgent requests for RMs should be initiated by Fax or e-mail. If required, overnight delivery is available with these charges added to the final bill.
Dr. Stephen A. Wilson
U.S. Geological Survey
Box 25046, MS 964
Denver, CO 80225
Tel: 303-236-2454
FAX: 303-236-3200 or 303-236-1425
e-mail: (wilson)
Domestic customers: Payment options include purchase order, check, money order, or credit card (Visa, Mastercard).
International customers: Payment on foreign orders can only be made using the following:
Payments for domestic or international orders using a credit card receive a 10% discount on the per bottle price.
Beginning in 2006, users of USGS geochemical reference standards must complete a user agreement form prior to the order being purchased.
User agreement for domestic users: Word format, 56 KB and PDF format, 24 KB.
User agreement for foreign users: Word format, 56 KB and PDF format, 28 KB.
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