franklinite A member of the spinel group of minerals, and an end-member of the magnetite series, with composition ZnFe3+2O4, although appreciable amounts of Mn2+ and Fe2+ are also present; sp. gr. 5.0; hardness 6; black; metallic lustre; crystals cubic but normally found as octahedra or granular aggregates; occurs at Franklin, New Jersey, in association with other zinc minerals in a metamorphosed limestone.
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wolframite , wolframite Ore mineral for tungsten, with the formula (Fe,Mn)WO4; sp. gr. 7.0–7.5; hardness 5.0–5.5; monoclinic; grey-black to brownish-black; browni… Uraninite , uraninite (pitchblende) Mineral, UO2; sp. gr. from 8.5 when massive to 10 for unaltered crystals; hardness 5–6; cubic; it is brownish-black or grey-b… Stibnite , stibnite (antimonite, antimony glance) One of the main ore minerals for antimony, with the formula Sb2S3; sp. gr. 4.6; hardness 2.0–2.5; orthorhombic… Hypersthene , hypersthene A member of the orthorhombic pyroxenes with approximately equal amounts of Fe and Mg in its composition MgFeSi2O6, it is a mineral occurr… chromite , chromite Member of the chromite group of minerals in the spinel group, Fe2+Cr2O4, along with magnesiochromite (MgCr2O4); sp. gr. 5.1; black; sub-meta… William Paterson , William Paterson was a distinguished public servant during the early years of the Republic of the United States, serving as governor of New Jersey, a…
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