GEOLOGY OF SAN DIEGUITO PYPROPHYLLITE AREA SAN DIEGO CO, CA by Jahns 1950 Mining

Description

Offered here for sale is a very good original complete copy of
GEOLOGY OF THE SAN DIEGUITO PYPROPHYLLITE AREA SAN DIEGO COUNTY, CALIFORNIA by Richard H. Jahns & John F. Lance
SF: CDMG Special Report 4,  November 1950. 11" X 8 1/4", pp 32 with 2 plates (maps); 21 b&w photos and figures, some folding; original pictorial wrappers. Covers a bit loose but holding, contents very good and unmarked. Not ex-library. Nicely illustrated work on this San Diego County area by Dick Jahns who is quite familiar with the gem producing pegmatites of this area.
Pyrophyllite
is used as an industrial mineral for dust-form insecticide carriers.
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