[meteorite-list] Primitive Achondrite Question

From: Bernd V. Pauli <bernd.pauli_at_meteoritecentral.com>
Date: Tue, 6 Dec 2011 19:17:36 +0000
Message-ID: <DIIE.0000006B000030BE_at_10.0.100.101>

Hi All,

Alan kindly wrote:

"George Merrill's "The Story of Meteorites" from 1929:

 There are andrites, eukrites, shergottites, howardites, bustites,
 chassignites, chladnites, amphoterites, howarditic chondrites, white
 chondrites, intermediate chondrites, gray chondrites, black chondrites,
 spherulitic chondrites, crystalline chondrites, carbonaceous chondrites,
 orvinites, tadjerites, ureilites, lodranies, grahamite mesosiderites,
 siderophyrs, and more."

or Tschermak for that matter:

The meteorite types known to date are:

I. Main constituents are pyroxenes and plagioclase.
   The crust is glossy.

- Eucrites (Rose). Augite and anorthite (or maskelynite).
- Howardites (Rose). Augite, bronzite, anorthite.

II. Pyroxenes and olivine form the main constituents.
    The crust is slightly glossy to dull.

- Bustites* (Tschermak). Diopside and enstatite. (*bustites = now aubrites)
- Chladnites+ (Rose). Enstatite with a little anorthite.

+Only Bishopville at Tschermak's time but Bishopville is an aubrite (!)

- Diogenites (Tschermak). Bronzite.
- Amphoterites (Tschermak). Bronzite and olivine. (now LL chondrites)
- Chassignites (Rose). Olivine. (now SNC)

III. Bronzite, olivine, iron as main constituents.

Chondrites (Rose). Texture chondritic.

IV. Iron, forming networks, enclosing silicates: plagioclase, olivine, pyroxenes, troilite.

- Grahamites (Tschermak). Plagioclase, bronzite, and augite, in iron.
(Vaca Muerta was a grahamite for Tschermak)
- Siderophyres (Tschermak). Bronzite in iron. (Steinbach)
- Mesosiderites (Rose). Bronzite and olivine in iron.
(Lodran (!) and Hainholz were mesosiderites for Tschermak)
- Pallasites (Rose) Olivine in iron.

V. Iron with subordinate troilite, schreibersite, etc.

- Iron meteorites

Tschermak omitted the name "shalkite" proposed by Rose because
reports on the composition of Shalka were contradictory at that time.

Reference:

TSCHERMAK G. (1885) Die mikroskopische Beschaffenheit
der Meteoriten (Stuttgart E. Schweizerbart'sche Verlagshandlung,
E. Koch, 23 pp.).

English Translation: The Microscopic Properties of Meteorites, Vol. 4,
No. 6 (Smithsonian Contributions to Astrophysics, Washington, D.C., 1964).

Cheers,

Bernd
Received on Tue 06 Dec 2011 02:17:36 PM PST