Leland Blue is actually a manmade type of beach glass created during the iron smelting process. While the blue variety is the most sought-after, it comes in a variety of purples, greens and grays.

Q: I was walking along the shore of Pontoosuc Lake last week when the weather was warm and the water was low. I found a piece of dull blue glass about the size of a golf ball in the gravel. Could it ...