Cumberlandite, State rock in Cumberland, United States
Cumberlandite contains a mix of 24 minerals, displaying white plagioclase crystals within a black granular groundmass and measuring high in iron content.
The mineral served as a material for manufacturing cannons during the Siege of Louisbourg in 1745, demonstrating its strategic importance in colonial times.
Rhode Island General Assembly designated cumberlandite as the official state rock in 1966, recognizing its geological and historical significance to the region.
Located exclusively at Iron Mine Hill in Cumberland, Rhode Island, this mineral deposit spans approximately 4 acres of accessible land.
The rock exhibits ferrimagnetic properties due to its high iron concentration, making it naturally responsive to magnetic fields.
Location: Rhode Island
GPS coordinates: 42.00486,-71.45361
Latest update: March 4, 2025 17:29
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