Clasts

Stony-iron pieces from inside the inner rim with inclusions of siderite (FeCo3) or iron
carbonate.  Although transparent or translucent with a bright vitreous luster, it
decomposes at a moderate termperature turning brown and often magnetic.

These clasts seen here are uncommon to fall back material unless they are mixed,
where the most common clasts appear to be quartz.

Next...