State Rocks and Stones of the United States

Time for the next installment documenting the peculiar exercise of declaring state rocks and state stones. At the moment, 25 states have succeeded in this, naming 17 different rock types (loosely defined). Vermont named three, not wishing to slight the state's prodigious quarries of granite, marble and slate. Several others have elevated fossils to this lofty status. But take a look at the gallery yourself, and make note of the handy list of state rocks/stones by state for that next bar bet.

Granite, state stone/rock of MA, NH, NC, SC, VT and WI — Geology guide photo