U.S. Geological Survey Certificate of Analysis

Quartz Latite, QLO-1

Sample for this reference material was collected in Lake County, Oregon approximately 380 km south east of Portland. The sample is derived from a lava flow on the flanks of an extrusive dome which is probably of late Miocene or early Pliocene age. The rock is greasy black and aphanitic, containing <1% microphenocrysts of plagioclase feldspar, pyroxene, and magnetite.

Element concentrations were determined by cooperating laboratories using a variety of analytical methods. Certificate values are based primarily on international data compilations (Abbey, 1983, Gladney, 1983, Gladney and Roelandts, 1987, Govindaraju, 1994). USGS reports (Flanagan, 1976) provide background information on this material.

Recommended Values | Certificate Information | Bibliography | Glossary | Notes | Order and Pricing Information

Oxide Wt % ± Oxide Wt % ±
SiO2 65.6 0.47 CaO 3.17 0.08
Al2O3 16.2 0.19 MgO 1.00 0.07
Fe2O3 1.02 0.13 Na2O 4.20 0.13
FeO 2.97 0.05 K2O 3.60 0.12
Fe2O3 T 4.35 0.14 P2O5 0.25 0.02
TiO2 0.62 0.03
Element µg/g ± Element µg/g ± Element µg/g ±
Ag 0.064 0.005 F 280 20 Ta 0.82 0.1
B 36 3 La 27 2 Tb 0.71 0.07
Ba 1370 80 Li 25 2 Th 4.5 0.5
Ce 54 6 Lu 0.37 0.4 Tm 0.37 0.04
Cl 220 18 Mo 2.6 0.3 U 1.9 0.12
Co 7.2 0.5 Nb 10 1.3 V 54 6
Cr 3.2 1.7 Pb 20 0.8 W 0.58 0.05
Cs 1.8 0.2 Rb 74 3 Y 24 3
Cu 29 3 Sm 4.9 0.2 Yb 2.3 0.2
Dy 3.8 0.3 Sn 2.3 0.09 Zn 61 3
Er 2.3 0.1 Sr 340 12 Zr 185 16
Eu 1.43 0.12
Element µg/g Element µg/g
As 3.5 Nd 26
Br 2.1 S 30
Ge 1.3 Tm 0.4

Return to top

Certificate Information

Denver, Colorado
revised March 1995

David B. Smith
Central Region Mineral Resources Team (formerly Branch of Geochemistry)

Return to top


Abbey, S., 1983, Studies in "Standard Samples" of Silicate Rocks and Minerals 1969-1982: Canadian Geological Survey Paper 83-15, p. 114.

Flanagan, F.J., 1976, Descriptions and Analyses of Eight New USGS Rock Standards: U.S. Geological Survey Professional Paper 840, 192 p.

Gladney E.S., and Roelandts, I., 1988, 1987 Compilation of Elemental Concentration Data for USGS BHVO-1, MAG-1, QLO-1, RGM-1, SCo-1, SDC-1, SGR-1, and STM-1: Geostandards Newsletter, 12:253-362.

Govindaraju, K., 1994, 1994 Compilation of Working Values and Descriptions for 383 Geostandards: Geostandards Newsletter, 18:1-158.

Return to top


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

Return to top


Unless otherwise indicated total element concentrations are reported for material on an as-received basis, i.e., no drying.

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