Nice big crystal of potassium feldspar w/ exsolution lamellae.
Meteorite impactite layer? Volcaniclasitics?
YOU be the judge.
Flip side of this sample: gigapan.com/gigapans/190109
Oceanic crust looks like this after it has been sheared out and metamorphosed in a subduction zone. Part of the Franciscan Complex.
Pressure solution seams in Devonian-aged Helderburg Group limestone from Corridor H.
44.837068, -111.289633 - Facing Northeast
Not a member yet? Sign up