I was mostly going by color. Basalts tend to be darker, and granitic rocks are very light in color. But it's really hard to look at photos... Having it in hand would be much easier (a necessity really).
I would be interested in learning what a professional would consider when faced with such a rock... It would be cool if someday the IMCA could host an ID workshop, maybe one year at Tucson or one of the European shows (where you're guaranteed a group of possible participants). Mark --- On Wed, 5/20/09, Michael Fowler <[email protected]> wrote: > From: Michael Fowler <[email protected]> > Subject: Re: [meteorite-list] Meteorite or Meteorwrong? > To: [email protected] > Cc: "Michael Fowler" <[email protected]> > Date: Wednesday, May 20, 2009, 7:20 AM > Most andesites have > phenocrysts. This one doesn't. Still could be > andesite, but maybe not. > > Mike Fowler > Chicago > > > > Mark B.>>I'd have to say andesite (definitely > not granite). << > > > > Well...after some page turning and googling etc, I > have to now agree with > > Mark that this rock is probably some sort of > andesite...and definitely not > > granite. I've never seen so many different rocks that > I formerly simply > > referred to as granite. :O) I haven't found a totally > matching photo of > > andesite to the photo eric referred to, but the > literature gave me the impression > > that andesite is what he has or is at least a good > guess. > > GeoZay > > > >> Looks like a fine grained basalt covered with > desert varnish. > >> > >> I see no fusion crust (flow lines etc.) and no > regamaglypts. In the > >> cut surface, no metal, no chondrules, and no heat > affected zone. > >> > >> Mike Fowler > >> Chicago > ______________________________________________ > http://www.meteoritecentral.com > Meteorite-list mailing list > [email protected] > http://six.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
