Fusion crusted Ni micro-meteorites preserved in a densely compacted handsample of volcanic ash. Vary from dust size particles to  about 1.5 mm. It was extremely difficult to polish a thin section of Ni down to 30 microns because of the hardness of that element.

While these graphs contain many fragments of Ni, there are many dust size spherical shapes distributed through out the mass. Many small grains are hollow.