Isheyevo (CB3b) - 2.60g Endcut with Bright Teal-Green
Inclusion
The Isheyevo meteorite was discovered in a field during harvest
by a tractor driver in October, 2003. The 16kg stone was found in the Ishimbai region of Bashkortostan, close to the Isheyevo village
in Russia. Isheyevo has been classified as a very rare
Carbonaceous Chondrite; CB3b with a Shock Rating of 1
(unshocked) and a Weathering Level of just 1
also. The fusion crust was well developed and dark brown in
colour. The meteorite itself is relatively unusual and rare.
It consists of Iron/Nickel metal grains, C, POP, rare BO
chondrules, chondrule fragments, CAIs, and matrix lumps.
Iron/Nickel metal comprises from 50% to 70% volume. Some of
these features are visible in the 2.6g Crusted Endcut below.
Also in this piece, is a bright teal-blue/green inclusion. It
measures no more than a couple of millimetres in diameter but
that is not unusual given the fact that most features in this
meteorite are on a similar scale. The most likely thing this
interesting feature would be, is a Hibonite-Rich CAI. Hibonite
is expected to be one of the first condensates formed in the
Solar Nebula. The
approximate colour of the inclusion is represented in the square
below.
This specimen is part of the Meteorites Australia Collection.
(MA.05.0086)
![Isheyevo (CB3b) - 2.60g Endcut](http://www.meteorites.com.au/features/ish.gif)
Approximate Inclusion Colour
An interesting abstract has
been written on Isheyevo by M.A. Ivanova, M.A. Nazarov, N.N.
Kononkova, and F. Brandstaetter. (PDF below) The paper reasons why this
meteorite was allocated into the (b) subgroup rather than (a). The (a) subgroup
includes members such as Bencubbin, Weatherford and Gujba which
are coarse-grained (up to 1cm) and contain 40-60 vol% of Iron/Nickel metal. The (b) subgroup
includes members such as HaH 237 and QUE 94411 which are
fine-grained and richer in Iron/Nickel metal (>70% volume). It also
indicates that Isheyevo is close to CH Chondrites and also
supports the genetic unity of the CR-CH-CB clan.
![](http://www.meteorites.com.au/images/p.gif)
Isheyevo: A new CB chondrite.
(31 KB)
![Isheyevo (CB3b) - 2.60g Endcut](http://www.meteorites.com.au/collection/Isheyevo%20CB3%202.60g%20(1%20of%206).jpg)
Isheyevo (CB3b) - 2.60g Endcut
![Isheyevo (CB3b) - 2.60g Endcut](http://www.meteorites.com.au/collection/Isheyevo%20CB3%202.60g%20(2%20of%206).jpg)
Isheyevo (CB3b) - 2.60g Endcut
![Isheyevo (CB3b) - 2.60g Endcut](http://www.meteorites.com.au/collection/Isheyevo%20CB3%202.60g%20(3%20of%206).jpg)
Isheyevo (CB3b) - 2.60g Endcut
![Isheyevo (CB3b) - 2.60g Endcut](http://www.meteorites.com.au/collection/Isheyevo%20CB3%202.60g%20(4%20of%206).jpg)
Isheyevo (CB3b) - 2.60g Endcut
![Isheyevo (CB3b) - 2.60g Endcut](http://www.meteorites.com.au/collection/Isheyevo%20CB3%202.60g%20(5%20of%206).jpg)
Isheyevo (CB3b) - 2.60g Endcut
![Isheyevo (CB3b) - 2.60g Endcut](http://www.meteorites.com.au/collection/Isheyevo%20CB3%202.60g%20(6%20of%206).jpg)
Isheyevo (CB3b) - 2.60g Endcut
Back
to 'The Unusual Meteorites Features Page' menu...
|