[meteorite-list] from Bernd
From: Larry & Twink Monrad <larrytwinkmonrad_at_meteoritecentral.com>
Date: Tue, 16 Feb 2010 15:51:15 -0700 Message-ID: <1DB4F7936C0A44278CE177E0B404B8A3_at_DFZN8X81> > > Hello Robert and All, > > I purchased my smallish 3.9-gram P.V. slice from Cap'n Blood back in 2001 > and it still looks > as fresh as it did 9 years ago. No rust but I found a golden-colored, > yellowish merrillite or apatite > (they are both phosphates after all!) crystal at one of these > metal-silicate interfaces. Regarding the > possibility that this might be rust, ...well, one look at such crystals > through a microscope (16x will > be sufficient) should reveal their true nature. This yellow crystal in my > slice is a genuine, translucent > crystal that betrays its nature through its form, its color, its > crystallinity (in my slice an elongate > prismatic crystal) and the fact that it is embedded in the metal silicate > interfacial area. Rust would be > bubbly, blisterous, grainy or powdery - it would not be translucent, it > would have the typical color > of rust (reddish-brown), and, it would protrude from the surface of my > slice or if it was really > incorporated into the matrix/metal interface, if it did not protrude from > the cut surface, it would > still be reddish-brown instead of displaying those typical colors of > apatite (green, gray with bluish > or yellowish tints - at least in hand sample). > > Best wishes from > Germany, > > Bernd > Received on Tue 16 Feb 2010 05:51:15 PM PST |
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