Identify strange rock

[Fodegrass]

The top part of the stone contains brown grains which is magnetic and the part below that is weightless and the gray part doesn't even feel like a stone.

 

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[Fodegrass]

The top part of the stone contains brown grains which is magnetic and the part below that is weightless and the gray part doesn't even feel like a stone.

90 percent of the density of the stone in where the brown particles are present.

 

[RRmech]

90 percent of the density of the stone in where the brown particles are present.

Conglomerate?

 

[desertau]

Saffordite?