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The mineral is fuchsite (pronounced with long u), the emerald green variety of muscovite (mica). Chromium in the crystal lattice gives it the distinctive green color. In places, it is rich enough in Cr to be mined. Also commonly found with embedded rubies. Fuchsite is rare, but has been found in locals around the world.JimBob was close enough with Mariposite to get credit for this one! Way to go JB!Next specimen will be more common mineral/rock.
No quarries nearby- the grooves are definitely some sort of layer in the rock, not drill holes.
Is it noticeably dense?
How about graphite
I'm guessing..... Glaucophane ?