80195646 Cumberlandite, a rare igneous rock found
80195646 Cumberlandite, a rare igneous rock found only in Rhode Island, where it is the state rock, It 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 rock, is responsible for the high density and magnetic property. John Cancalosi All images are copyright protected and remain the property of Ardea Picture Library Ltd. Permission for use is only granted once fee has been agreed and payment made and all digital files must be destroyed unless agreed otherwise in writing. Images must be credited: Photographer Name / ardea.com www.ardea.com
