[meteorite-list] Mesosiderite types

From: Devin Schrader <makinsomenoise_at_meteoritecentral.com>
Date: Thu Apr 22 10:32:50 2004
Message-ID: <000501c40bb7$b92e0c60$6501a8c0_at_hewlett9por0s0>

Rob,

A full description is in:
Reviews in Mineralogy Volume 36
Planetary Materials, J.J. Papike, editor
Publisher: Mineralogical Society of America, 1998

"The mesosiderites are divided into three petrologic groups based on the
orthopyroxene content (Hewins 1984, 1988: see Fig. 53). Compositional class
A mesosiderite silicates are relatively basaltic in composition, containing
more plagioclase and clinopyroxene. The compositional class B mesosiderite
silicates contain a greater proportion of orthopyroxene, and are therefore
more ultramafic. A unique mesosiderite from Antarctica, RKPA79015, contains
almost exclusively orthopyroxene as its silicate phase (Prinz et al. 1982a),
and is the sole member of compositional class C (Hewins
1988)................." ect....(pg 4-143)

This is from 1998, and at least one more C type has come out of Morocco so
the definition of class C might be better refined, ect.

Devin Schrader



----- Original Message -----
From: "Rob Wesel" <nakhladog_at_comcast.net>
To: "Meteorite List" <meteorite-list_at_meteoritecentral.com>
Sent: Tuesday, March 16, 2004 3:40 PM
Subject: [meteorite-list] Mesosiderite types


> Hello all-
> Can anyone out there point me in the right direction as to the differences
> between type A, B, and C mesosiderites...and what those differences mean?
> Thanks in advance,
>
> Rob Wesel
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Received on Tue 16 Mar 2004 07:35:18 PM PST