Rhode Island State Rock
Adopted in 1966.
In 1966 by the Rhode Island Common Assembly officially adopted Cumberlandite as a result of this can be very rare and for its unique nature because the official state rock of Rhode Island (Resolution #268). It is only found in giant concentrations on a four-acre lot in Blackstone Valley, Cumberland, and in traces scattered all through the Narragansett Bay watershed. As a result of its excessive quantities of iron, it’s slightly magnetic.
Rhode Island State Rock: Cumberlandite
Cumberlandite is the Official State Rock of Rhode Island. This very particular rock was initially named Rhodose and was recognized hundreds of years in the past but was renamed Cumberlandite by Wadsworth (1861). That is a particularly rare and unique stone and has vital historic and geological interest. Heavy black or darkish brown rock with white markings. It’s found South of Cumberland on both sides of Narragansett Bay and has not been found outdoors the state of Rhode Island. It is classed as a wide range of ferrogubbro and is an porphyritic igneous rock composed of crystals white plagioclase feldspar in a finer-grained groundmass of magnetite, ilmenite, and olivine that was “stewed in its own juices”. The feldspar and olivine modified to a high-quality-grained serpentine. It would entice a magnet and this characteristic is taken into account a positive technique of identification. Scientists have estimated the age of Cumberlandite to be about one and one-half billion years when a small volcano erupted and 24 completely different minerals mixed along with molten rock and when it cooled formed a slightly magnetic rock that is iron rich. Cumberlandite is usually mistaken for a meteorite. It is because it has intense magnetic susceptibility, its excessive specific gravity, and common pitted nature.
This uncommon ore deposit is world renown and thought to be the biggest and purest physique of ore in New England. It’s situated on a three.7 acre parcel in Cumberland, Rhode Island 02864 near the intersection of West Wrentham Road and Elder Ballou Meetinghouse Road It is about three miles east of Woonsocket, RI, four miles SW of the NE corner of RI and one mile from the Massachusetts state line. It’s the world’s only identified site of Cumberlandite rocks. The area is named “Iron Mine Hill.
These extremely uncommon rocks have been deemed sacred by the Nipmuck Indian Tribe. m m stone island Cumberlandite was also used as early as 1703 for cannons, weapons and farm instruments through the Revolutionary War when it was recognized as a possible ore of iron. It was combined with hematite from the Hopkins Iron Mine in Cranston, Rhode Island and was cast by Philip Brown at Abbott’s Run in Cumberland. Someday later, John Brown of Providence, R.I.was contracted for iron utilized in cannons by the US Government. He used a mixture of Cumberlandite and Cranston ores and smeltered them in Easton Massachusetts.
The Iron Mine Hill outcrop, elliptical in cross section, was estimated to be approximately 1,200 ft long on its main axis, and 500 to 600 ft on its minor axis. Jackson (1840) calculated the mass of porphyrytic magnetic iron ore, 462 feet long, 132 toes wide and 104 ft excessive with 6,342,336 cubic ft of ore visible. It has a particular gravity of three.82-3.88 giving it tonnage of approximately 7,641,488 tons. Jackson’s evaluation stated this may yield about 3,000,000 tons of ore and over 1,000,000 tons of titanium.
Rhode Island Regulation
Cumberlandite was formally established because the state rock in 1966 by Decision No. 268. This is the same year and decision number that designated the state mineral as Bowenite.