A little gem from an eastern Concord corn field.
Around here, mylonite is said to be from Sudbury. It is often green, slightly translucent, and sort of jade like. This is a "Merrimac" point type called a "Stark point". They are from the Middle Archaic 3-5K BC.I nearly missed it as I stepped over it - it was the same color as the dirt.
Here are some back-lit views: