Washington State has an amazing variety of green rocks.  Many of them originated as oceanic basalts that were metamorphosed and converted into beautiful shades of greens, greys and sometimes blues.  

Rock type: Metamorphic basalt

This rock has an amazing greenish blue color.  The dark specs give it a unique contrast and texture.  I’m always surprised by the contrast between the outer crust and inner colors of these types of rocks.

Chemical composition: The exact composition of this rock is not known.  The origin is an ultra mafic oceanic basalt.