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Cumberlandite is a type of igneous rock. It is the state rock of the U.S. state of Rhode Island. It is only found in large concentrations on a 4-acre (16,000 m ) lot in Blackstone Valley, Cumberland, and in traces scattered throughout the Narragansett Bay watershed. Due to its high amounts of iron, it is slightly … See more The rocks were discovered by settlers hundreds of years ago, and were initially deemed valuable for the manufacture of cannon and farm tools in the 18th and 19th centuries. The rock also contains a relatively high level of See more The rock is an uncommon mafic igneous rock known as a troctolite. It is black with phenocrysts of plagioclase in a medium grained matrix of magnetite, ilmenite, olivine and hercynite spinel. The abundance of magnetite and ilmenite, which may be up to 70 percent of the … See more WebJul 23, 2014 · Cumberlandite is only found at this one four-acre site on the entire planet. It is Rhode Island's state rock. Cannons were made from it … WebDoes Covellite Make a Good Jewelry Stone? Cut covellites (or covellines) have no great value. With hardness ranging from 1.5 to 2, coins and fingernails could scratch these … iowa december storms