Cumberlandite is a specific type of plutonic rock called a melanocratic troctolite, or melatroctolite. It is the state rock of Rhode Island and can be found in a 4-acre (0.016 km2) lot in Cumberland, Rhode Island at Iron Mine Hill.
Further traces can be found scattered throughout the Narragansett Bay watershed as far as Martha's Vineyard and Block Island. Cumberlandite is not exclusive to Rhode Island; it is also found in Taberg, Sweden.
Cumberlandite is a specific type of plutonic rock called a melanocratic troctolite, or melatroctolite. It is the state rock of Rhode Island and can be found in a 4-acre (0.016 km2) lot in Cumberland, Rhode Island at Iron Mine Hill.
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