A short sunset hike before the talk (sunset is 6:48). We'll leave at 5:30 PH (sharp), walk down Judah to Ocean Beach, head northward towards Cliff House. After about 30 minutes we'll turn around, and then return to the SFGMS to get good seats for the talk (and time to hit one of the few restaurants/cafes in the neighborhood where you can get take-out food as well).
If you can't make the hike, you're still invited to the talk :-)
"Pegmatites!" San Francisco Gem & Mineral Society's October general meeting
Speaker: Christopher Lewis, Professor of Physical Geology & Science, City College of San Francisco
Friday, October 4, 2013 • 7 p.m. • Free
Curious about Pegmatites? Professor Lewis will tell us all about them. Geological oddities, pegmatite are bodies of very coarse-grained intrusive igneous rock, usually near igneous bodies, with quartz, feldspar and mica as typical components. Some pegmatites contain just those minerals, in large crystal sizes; other pegmatites produce valuable "rare earth" minerals and radioactive species. But the famous gem-bearing 'pegs' are much sought after for their hollow pockets yielding colorful gemstones like tourmaline, topaz, aquamarine & other beryls, garnets and amazonite. These have put San Diego County, Maine, Russia's Ural Mountains, Madagascar – and most recently the Hindu Kush of Afghanistan & Pakistan – "on the map" for the world's mineral and gem dealers and collectors. Join us for a most enlightening evening!
Address: 4134 Judah Street, San Francisco (between 46th and 47th Aves. (2 blocks south of Golden Gate Park, not far from the Ocean Beach)
Refreshments are served after the meeting. The N-Judah MUNI streetcar stops very close to our door Parking can be scarce; carpool & try on Judah St., or one block south on Kirkham Street.
PS. No dollar requested for this "hike." I'm guessing the SFGMS will pass a bucket if you have any extra cash :-)