[meteorite-list] TSCHERMAK G. (1885) - Part 3

From: Michael L Blood <mlblood_at_meteoritecentral.com>
Date: Thu Apr 22 10:32:49 2004
Message-ID: <BC78743F.12A12%mlblood_at_cox.net>

Ah, Bernd,
        It is SO good to have you back on the list!
        Thanks, Michael


on 3/13/04 3:18 AM, bernd.pauli_at_paulinet.de at bernd.pauli@paulinet.de
wrote:

> Marcie kindly wrote:
>=20
>> Just a quick thank-you for sending the 2 part translated information
>> on meteorite identification to the list. Very helpful to me, and others
>> I'm sure, as a person, trying to learn all I can about meteorites and
>> starting from the beginning in education. Best Regards, Marcie
>=20
> Hello Marcie, Mark, and List,
>=20
> My pleasure but please bear in mind that this publication is more than
> 100 years old - in other words, some of the information may be outdated.
> But apart from this tiny grain of salt, Tschermak makes very interesting
> reading, and the 100 black and white pics of thin sections with detailed
> descriptions presents a tremendous amount of information on the mineralog=
y
> and petrography of meteorites.
>=20
> Best wishes,
>=20
> Bernd
>=20
>=20
>=20
> TSCHERMAK G. (1885) Die mikroskopische Beschaffenheit der Meteoriten
> (Stuttgart E. Schweizerbart'sche Verlagshandlung, E. Koch, 23 pp.).
>=20
> English Translation: The Microscopic Properties of Meteorites, Vol. 4,
> No. 6 (Smithsonian Contributions to Astrophysics, Washington, D.C., 1964)=
.
>=20
> Translation by J.A. Wood and E.M. Wood
>=20
> General Characteristics of Meteorites
>=20
> Stony meteorites very frequently have the character of a volcanic tuff,
> consisting of small fragments, chips, and rock powder. The fragments
> are sometimes alike (Shalka), sometimes conspicuously heterogeneous
> in composition (Luotolax). Occasionally the solid groundmass is quite
> different from the grains embedded in it, giving the meteorite a porphyri=
tic
> appearance (Goalpara).
>=20
> Some of the stony meteorites have a crystalline-granular texture (Chassig=
ny,
> Shergotty, Ibbenb=FChren), but all gradations exist between these and tuffl=
ike
> meteorites, so that the same stone (e.g., Stannern) may be described as
> crystalline by one observer and clastic by another. Dense, semivitreous
> masses (Tadjera), similar to the dark groundmasses of several breccias
> noted above, are rare.
>=20
> Most stones have a chondritic texture, conspicuous or indistinct. Spheres=
 and
> rounded bodies consisting of one or several single crystals or often of
> several
> different minerals may form almost the whole of the stone (Borkut); or th=
ey
> may
> lie, intact or fractured, in a friable or solid tuffaceous groundmass
> (Ausson).
> These spherical structures are usually smaller than peas; I consider them=
 to
> be solidified drops. The groundmass is occasionally black (Renazzo, Grosn=
aja).
> Several stones consist almost entirely of a black mass, colored by carbon
> (Cold Bokkeveld).
>=20
>=20
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Received on Sat 13 Mar 2004 11:18:08 AM PST