Deep green
emerald has been reported in the Devonian miarolitic pegmatites of the Topsham area, 30 km north-east of Portland, Maine. Jewelry stones, such as blue
topaz,
aquamarine and
chrysoberyl, were recovered as by-products.
Ref: E.Ya. Kievlenko ( 2003) Geology of gems, p. 79
Gemstone List