matrix rock that beeps / help

[H-2 CHARLIE]

found this rock sun. rock hounding it beeps so im guessing there is metal but not crazy beeps ..... any one seen a matrix looking rock ?

 

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[Tigger]

Neat rock - maybe some more detailed pictures, dampen it, zoom in? Try a magnet on it?
Just some thoughts til someone else chimes in.
Tigger

 

[H-2 CHARLIE]

Anyone seen any thing like it ?

 

[Eu_citzen]

Commonly called "Chinese Writing" rock/stone, some mafic stone. I think the one's I got are diabase.