U.S. Geological Survey Certificate of Analysis

Carbonatite, COQ-1

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


Information Values

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

Return to top


Certificate Information

Denver, Colorado
April 3, 1995

Dr. Geoff Plumlee
U.S. Geological Survey
Central Region Mineral Resources Team

Return to top


Order and Pricing Information

Placing an Order

USGS reference materials may be obtained directly from Dr. Stephen A. Wilson. The price for each reference material is listed in U.S. dollars and are subject to change. For domestic orders, this cost includes all shipping and handling charges using normal mail delivery by the U.S. Postal Service. For foreign orders, delivery charges will be added to the final bill. Urgent requests for reference materials should be initiated by Fax or e-mail. If required, expedited delivery is available with any additional shipping charges added to the final bill.

To order a USGS Reference Material, please contact Dr. Stephen Wilson or use the downloadable form: Order Form (Word) (22 KB) or Order Form (PDF) (238 KB).

Dr. Stephen A. Wilson
U.S. Geological Survey
Box 25046, MS 964D
Denver, CO 80225
Tel: 303-236-2454
FAX: 303-236-3200 or 303-236-1425
Email: (swilson@usgs.gov)

Payment Options

Domestic customers: Payment options include purchase order, check, money order, or credit card (Visa, Mastercard, American Express).

International customers: Payment on foreign orders can only be made using the following:

  • Banker's draft against an international bank
  • International money order
  • Credit card (Visa, Mastercard, American Express)

Payments for domestic or international orders using a credit card receive a 10% discount on the per bottle price.

User Agreements

Beginning in 2006, users of USGS geochemical reference materials must complete a user agreement form prior to the order being processed. This agreement is required by the USGS Technology Transfer Office for complying with the United States Economy Act, 31 USC 1535A.

Please download the agreement form and follow the instructions on the form when placing your order.

Return to top | Back to Certificate List | Mineral Resources Program | Crustal Geophysics and Geochemistry Science Center