In particularly, the shale beds close to the mega-porphyritic andesites and spilitic
basalts show the highest grade, suggesting that the source rocks in the area controlled the degree of mineralization.
* From the western part of Sierra de los Placeres to the northwestern part of Sierra de Campo Nuevo the San Hipolito consists of serpentinites, microgabbros, spilitic
pillow lavas, ophicalcites, radiolarites, with minor interbedded tuffs and claystones.
Accordingly, varying degrees of mobility for some major elements are apparent as is indicated on the alkali diagram, where many samples plot outside the igneous spectrum in the spilitic
Hemant Merchant (72, Casagrande, Little Gibbs Rd., Behind Hanging Gardens, Bombay-400 006, India) had about 10 giant specimens of a new Indian habit of calcite, these specimens found in November-December 2002 during excavation for a new water tunnel between Pathanwadi and Kurar, Bombay-Malad (recall that this area was supposedly finished for specimens, urban sprawl having put an end to nearly all quarrying of the spilitic
basalts around Bombay).
Since these puffballs occur only in the spilitic
basalts around Bombay, and since the Pathanwadi is the last major quarry still working in the metropolitan area, this may be the last significant new find of okenite that we will see.