JUL 6 B62
IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY

(UNIVERSITY OF LONDON)
Y DEPARTMENT OF GEOLOGY

PRINCE CONSORT ROAD
SOUTH KENSINGTON
LONDON - - S.W.7

Telephone: KENSINGTON 5111

3rd. July 1962

Dear Prof.Lederberg,

Thank you for your inquiry (June 5th.1962) about the
reflection-transmissi@én properties of naturally occurring minerals.in the
UV.region of the spectrum.Unfortunately I cannot cite any literature on
this subject, having only come acrogs limited data on the reflectivities
of certain metals in the UV.,in the.International Critical Tables,or the

Tables of Physical and Cyemical Constants by Kaye and Laby,etc.

“I WI +

-_ With regard to the other publication on. .the reflectiviy~ ~~
of: ore minerals,this has just appeared in'Economic Geology’ jel will foreward

a-copy as soon as I receive the separates.

Yours sincerely,

(DrsI.M, GRAY)