U.S. Geological Survey Geochemical Reference Materials and Certificates
U.S. Geological Survey
Certificate of Analysis
Material was collected in 1976 from the Bull Run quarry near Centreville, Virginia. This is the same collection site as USGS reference mateirals W-1 (Fairbairn, 1950). The diabase consists of augite and plagioclase with smaller amounts of quartz, potassium feldspar, biotite and opaque minerals.
Values listed are derived using at least two independent techniques from at least two independent laboratories. Statistical treatment of the data uses the procedures outlined in previous USGS publications (Flanagan and Gottfried, 1980). Supplemental information is derived from international data compilations (Gladney and Roelandts, 1988, Govindaraju, 1994,).
Values are presented when only a single method of analysis was used or results from independent laboratories are not in statistical agreement.
Recommended Values | Information Values | Certificate Information | Bibliography | Glossary | Notes | Order and Pricing Information
| Oxide | Wt% | ± | Oxide | Wt% | ± | |
|---|---|---|---|---|---|---|
| Al2O3 | 15.45 | 0.16 | MgO | 6.37 | 0.058 | |
| CaO | 10.86 | 0.078 | MnO | 0.167 | 0.004 | |
| Fe2O3 | 1.53 | 0.87 | Na2O | 2.20 | 0.037 | |
| FeO | 8.34 | 0.093 | P2O5 | 0.14 | 0.12 | |
| Fe2O3T | 10.83 | 0.21 | SiO2 | 52.68 | 0.29 | |
| K2O | 0.626 | 0.012 | TiO2 | 1.06 | 0.01 |
| Element | µg/g | ± | Element | µg/g | ± | Element | µg/g | ± | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Ba | 170 | 11 | Hf | 2.6 | 0.18 | Sr | 190 | 3 | ||
| Ce | 23 | 1.5 | La | 10 | 0.59 | Th | 2.4 | 0.1 | ||
| Co | 43 | 2.1 | Li | 9.6 | 0.54 | V | 260 | 12 | ||
| Cr | 92 | 4.4 | Nd | 13 | 1 | Y | 23 | 1.6 | ||
| Cu | 110 | 4.9 | Ni | 70 | 2.5 | Yb | 2.1 | 0.2 | ||
| Dy | 3.6 | 0.8 | Rb | 21 | 1.1 | Zn | 80 | 2 | ||
| Eu | 1.0 | 0.06 | Sc | 36 | 1.1 | Zr | 100 | 2 | ||
| Ga | 17 | 0.89 | Sm | 3.3 | 0.13 | |||||
| Element | µg/g | Element | µg/g | Element | µg/g | ||
|---|---|---|---|---|---|---|---|
| As | 1.2 | F | 205 | Sb | 0.79 | ||
| B | 12 | Ho | 0.76 | Ta | 0.5 | ||
| Be | 1.3 | Lu | 0.33 | Tb | 0.63 | ||
| Cl | 190 | Nb | 7.9 | Tm | 0.38 | ||
| Cs | 0.99 | Pb | 9.3 | U | 0.53 | ||
| Er | 2.5 | Stot | 79 | ||||
Denver, Colorado
revised March 1995
David B. Smith
Central Region Mineral Resources Team (formerly Branch of Geochemistry)
Flanagan, F.J., and Gottfried, D., 1980, USGS rock standards III; Manganese-nodule reference samples USGS Nod-A-1 and USGS-Nod-P-1: U.S. Geological Survey Professional Paper 1155, 39 pp.
Flanagan, F.J., 1984, Three USGS Mafic Rock Reference Samples, W-2, DNC-1, and BIR-1, U.S. Geological Survey Bulletin 1623, p 54.
Gladney, E.S., and Roelandts, I., 1988, 1987 Compilation of Elemental Concentration Data for USGS BIR-1, DNC-1, and W-2, Geostandards Newsletter, 12: pp 63-118.
Govindaraju, K., 1994, 1994 Compilation of Working Values and Descriptions for 383 Geostandards, Geostandards Newsletter, 18:1-158.
| Symbol | Definition |
|---|---|
| Fe2O3T | Total iron expressed as Fe2O3 |
| Ctot | Total carbon concentration |
| Stot | Total sulfur concentration |
| Wt% | Percent of total element concentration |
| µg/g | Total element concentration expressed as micrograms of element per gram of solid sample |
| ± | One standard deviation |
Unless otherwise indicated total element concentrations are reported for material on an as-received basis, i.e., no drying.
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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