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Hi Bernd and list
Oh yes, I have a magnificent collection of rocks (terrestrial) and I agree - I'd leave the caliche - if necessary lightly brush it off, don't forget that Troilite and other sulphides will also react with the HCL to give off a smelly gas! You could be left will a stinky sludge!!!
thanks for the data
dave
IMCA #0092
-------Original Message-------
Date: 10/05/2004 17:24:10
Subject: Re: [meteorite-list] caliche cleaning and Parnallee question
Dave and List,
Dave, you also used to collect minerals (or still do). Remember how ugly
an amethyst looks after a wash with HCL? Instead of risking fragments
to break away or having other mineral constuents dissolved, I'd rather
leave some caliche
> Also, having just bought a 40g slice of Parnallee (Wow!!!)
> can any one confirm whether it is a L3.6 or an LL3.6?
Congratulations!
Yes, I can confirm: LL3.6, brecciated; gas-rich; unequilibrated;
microgabbro clasts - some people classified it as an LL3.7 *
* Reference:
NELSON V.E. et al. (2002) Size-frequency distribution of chondrules
and chondrule fragments in LL3 chondrites: Implications for parent-body
fragmentation of chondrules (MAPS 37-10, 2002, 1361-1376).
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