Metal Rock

[monkerz]

I am totally new at metal detecting. My son and I went out today for our first run of the year and found this rock. I have a AT PRO and it beeps at 90-91. Does anyone know where I can look online to find out the type of rock this is?

I have attached some pictures.

 

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[bigfoot1]

looks like copper sulphide.not long exposed.silver often associated with a head ore like that