Outcrop of Mysterious Black Rock

[605dano]

I was out looking for gold nuggets and was detecting along a stained quartz vein when an outcropping of this black rock gave off strong signal. I was swinging an MXT and the iron readout was showing 80-90%. But the VDI was around 0. Very strong signal, not like hot rock. The outcrop was about 30' sq. Anyone have a clue what this rock might be? There are tin and tungsten mines also in the area.

 

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[roadrunner]

Try the name Augite. Google it and see if thats what you have.