State Rock: Cumberlandite (1966)
State Mineral: Bowenite (1966)
Cumberlandite is an intrusive igneous rock. Due to the high amounts of iron it contains, it is slightly magnetic.
Bowenite is a compact variety of the serpentinite species antigorite. It is considered a semi-precious gemstone and can be found in the northern parts of Rhode Island.
The best places to rockhound in Rhode Island are the beach gravels of Narragansett Bay and Mt. Hope Bay, particularly at Bonnet Shore Beach, Warwick, and Pawtuxet. Diamond Hill and Iron Hill Mine are now closed.
Please note that rock collecting locations are always changing so be sure to check with the site owner for the most current information before going.
Dig safe, never go underground, and make sure to get permission from the landowner to search for and collect rocks.