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La Trobe University                      Department of Geology
Bundoora / Victoria / Australia 3083     Telephone 478 3122

                                         14th April, 1976.
Dr. B. Mason,
Department of Mineral Sciences,
National Museum of Natural History,
Smithsonian Institution,
[[underline]] WASHINGTON [[/underline]], D.C. 20560.

Dear Brian,

    Bill Compston and I have started a Rb-Sr dating project on enstatite achondrites at the A.N.U. by redetermining Bishopville. I would be very grateful if you could provide us with a sample of Pena Blanca Spring for dating or suggest a source. Pena Blanca Spring would give a better base for interpreting the complicated Bishopville data and allow a further comparison with I-Xe results.

    We require an absolutely clean 5 g chip for mineral separation and this would be best achieved if you could supply an 8 to 10 g fragment freshly broken from an interior surface. Contamination is the bugbear as usual, so that a broken fragment is superior to a sawn one. Given the 10 g chip we would then strip it to 5 g in the clean room at A.N.U.

                                     Yours sincerely,
                                     Chris Gray
                        [[underline]]Chris Gray[[/underline]]

Transcription Notes:
I transcribed the signature as well as the type underneath.

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