Dual Lithology NWA
is an extraordinary specimen that clearly displays two very
distinct and different types of matrix. It is a halved
individual weighing 32.30g and is the only known stone. I could only guess that
the orange matrix is possibly around H4 in classification and
the darker brown, H3 or something similar. Both halves
show very distinct chondrules although they are multi-coloured
in the darker brown half but with slightly more visible metal
in the orange matrix. Interestingly, there are also vesicles
located along the boundary of the two different matrix's. The fusion crust is also a little
different with the two halves and hints at orientation during
its fiery passage to the Earth's surface. Part of the back of
one half has also sheared and broken away along the border of
the matrix's. This probably occurred very late in flight or when
it hit the ground. One could only imagine
how a specimen such as this might form in the depths of space.
This specimen is part of the Meteorites Australia
Unclassified Saharan - 32.30g Halved Individual.
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