Olive Green Stone with Dark Green specks

[DarkDude]

This is one of the sea pebbles i got, not it polishes to a shine easily just with emery paper, but yet not very easy to cut. any ideas what it might be? could it be granite?

 

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[DarkDude]

could it be olive Jade?

 

[DarkDude]

could it be olive Jade?

i found this on the net


it has similar dark green speckling