Rhode Island State Rock
Adopted in 1966.
In 1966 by the Rhode Island Normal Meeting formally adopted Cumberlandite because this can be very uncommon and for its distinctive 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 throughout the Narragansett Bay watershed. Due to its excessive amounts of iron, it’s slightly magnetic.
Rhode Island State Rock: Cumberlandite
Cumberlandite is the Official State Rock of Rhode Island. This very special rock was initially named Rhodose and was recognized a whole bunch of years in the past but was renamed Cumberlandite by Wadsworth (1861). That is an especially rare and unique stone and has important historical and geological interest. Heavy black or darkish brown rock with white markings. It is found South of Cumberland on both sides of Narragansett Bay and has not been found outdoors the state of Rhode Island. It’s classed as a variety 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 should entice a magnet and this characteristic is taken into account a constructive means 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 barely magnetic rock that is iron rich. Cumberlandite is often mistaken for a meteorite. It’s because it has intense magnetic susceptibility, its excessive particular gravity, and customary pitted nature.
This uncommon ore deposit is world renown and thought to be the largest and purest physique of ore in New England. It is positioned on a 3.7 acre parcel in Cumberland, Rhode Island 02864 near the intersection of West Wrentham Street and Elder Ballou Meetinghouse Road It is about three miles east of Woonsocket, RI, four miles stone island clothing sale SW of the NE nook of RI and one mile from the Massachusetts state line. It’s the world’s solely recognized site of Cumberlandite rocks. The world is called “Iron Mine Hill.
These extremely uncommon rocks were deemed sacred by the Nipmuck Indian Tribe. Cumberlandite was additionally used as early as 1703 for cannons, weapons and farm instruments throughout the Revolutionary Battle when it was acknowledged as a attainable 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. Sometime later, John Brown of Providence, R.I.was contracted for iron used 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 toes lengthy on its major axis, and 500 to 600 feet on its minor axis. Jackson (1840) calculated the mass of porphyrytic magnetic iron ore, 462 feet lengthy, 132 ft extensive and 104 toes excessive with 6,342,336 cubic toes of ore seen. It has a particular gravity of 3.82-three.88 giving it tonnage of roughly 7,641,488 tons. Jackson’s analysis acknowledged this might yield about 3,000,000 tons of ore and over 1,000,000 tons of titanium.
Rhode Island Law
Cumberlandite was formally established because the state rock in 1966 by Decision No. 268. This is similar yr and resolution quantity that designated the state mineral as Bowenite.