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Material used in the preparation of this reference material was collected from a quarry located in Twin Sisters Range, approximately 20-due-miles east of Bellingham, Washington. The Twin Sisters dunite is composed of virtually unaltered, coarse grained enstatite bearing dunite with accessory amounts of chromite and chromium diopside (Ragan, D.M., 1963). Mineralogical analysis of DTS-2B reveals that the dominant mineral is Fosterite (90+%) with minor amounts of chromite and trace amounts of lizardite. DTS-2B was collected from the same general location as DTS-1.

Element concentrations were determined in a round robin study involving 20 international laboratories. Recommended values are listed when analytical results provided by three independent laboratories using a minimum of two independent analytical procedures are in statistical agreement. Information values with standard deviations are listed when at least two independent laboratories have provided information. Information values without standard deviations represent information from a single laboratory or analytical procedure.

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

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Recommended Values

Element	Wt %	±		Oxide	Wt %	±
Al	0.24	0.03		Al2O3	0.45	0.06
Ca	0.09	0.01		CaO	0.12	0.01
Fetot	5.43	0.15		Fe2O3tot	7.76	0.21
Mg	29.8	1.1		MgO	49.4	1.8
Si	18.4	0.4		SiO2	39.4	0.8

Element	µg/g	±		Element	µg/g	±
Co	120	10		Ni	3780	220
Cr	15500	1100		V	22	8
Mn	830	40		Zn	45	5

Element	Wt %	±		Element	µg/g
Fe(II)	4.27	0.20		Ba	16
Na	0.02			Cu	3
				Ge	0.7
				Pb	4
				Rb	2
				Sb	0.6
				Sc	3

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Certificate Information

Denver, Colorado
March 2001

Dr. Stephen Wilson
U.S. Geological Survey
Crustal Imaging and Characterization Team

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Bibliography

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Glossary

Symbol	Definition
±	One standard deviation
Wt %	Weight percent of element/oxide as received
µg/g	Micrograms of element per gram of sample, as received

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Notes

Unless otherwise indicated, total element concentrations are reported for material on an as-received basis.

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Order and Pricing Information

Placing an Order

USGS reference materials (RMs) may be obtained directly from Dr. Stephen A. Wilson. The price for each RM 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 RMs 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 order form: Word format (48 KB) or PDF format (28 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
e-mail: (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 appropriate version of the agreement and follow the instructions on the form when placing your order.

• User agreement for domestic users: Word format, 48 KB and PDF format, 124 KB.
• User agreement for foreign users: Word format, 52 KB and PDF format, 134 KB.

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