Hi Robert, Thanks for the update from Dr. Rubin. Now I am wondering when (if) more stones will be found. :)
Best regards and happy huntings, MikeG -- ------------------------------------------------------------- Web - http://www.galactic-stone.com Facebook - http://www.facebook.com/galacticstone Twitter - http://twitter.com/GalacticStone Pinterest - http://pinterest.com/galacticstone RSS - http://www.galactic-stone.com/rss/126516 ------------------------------------------------------------- On 10/30/12, Robert Verish <bolidecha...@yahoo.com> wrote: > Greetings All, > > It is my distinct pleasure to have the honor of passing along the following > characterization of the "Novato" meteorite. Here is the message that I > received from Dr. Alan Rubin: > > I just finished analyzing the Novato "N01" stone: > > It is an L6 breccia. W0 S4 > olivine Fa 24.1±0.4 (n=21) > Low-Ca pyx Fs20.7±0.5 Wo1.5±0.2 (n=22) > Ca-pyx Fs8.0±0.7 Wo44.7±0.8 (n=5) > The chromite grains are somewhat richer in Al2O3 (6.4 wt.%) and MgO (3.4 > wt.%) than unshocked OC chromite, but are more characteristic of shocked and > shock-melted chromite grains. > Most of the metallic Fe-Ni is taenite with 77.7±5.0 wt.% Fe, 21.4±5.4 wt.% > Ni and 0.51±0.18 wt.% Co (n=18). Only one kamacite grain was identified > (7.2 wt.% Ni and 1.1 wt.% Co). > The Co content of this single grain is intermediate between the ranges for L > (0.70-0.95 wt.% Co) and LL (1.42-37.0 wt.% Co) chondrites, but is closer to > L. > > Plagioclase: Ab86.0±0.6 Or7.0±0.4 (n=14) is richer in alkalis than typical > OC plagioclase, and probably reflects shock melting. > > Troilite is essentially pure FeS; it contains no detectable Cr, Co or Ni. > > And as I said before: > > Silicates have weak mosaic extinction. Plagioclase grains range from 50-200 > µm. There are lots of troilite veins going through large portions of the > rock (silicate darkening). Chromite grains are fractured; many have > troilite veins transecting them. There are a few chromite-plagioclase > assemblages. > I found one 12x20-µm-size grain of metallic Cu. > Some of the troilite grains are polycrystalline. > There are some patches where plagioclase has been melted and mobilized. > There is localized melting around some of the metal and sulfide grains. > There are a few silicate shock melt veins replete with small metal and > sulfide blebs. There are some chondritic clasts with far fewer veins that > have moderately large, highly recrystallized barred olivine and porphyritic > olivine-pyroxene chondrules that are well integrated into the matrix. These > chondritic clasts are much lighter-colored in transmitted light than the > matrix of the rock. > > Please pass this info along to all interested parties. > > End of message from Dr. Rubin. > > With best regards, > Bob V. > ______________________________________________ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list