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Coffinite
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==Physical properties== Initial examination of coffinite by Stieff et al. described the mineral as black in color with an adamantine luster, indistinguishable from [[uraninite]] (UO<sub>2</sub>).<ref name=Stieff56/> Additionally, the discoverers reported that although no cleavage is seen in coffinite, it does exhibit subconchoidal fracturing and is very fine grained. Initial samples showed a brittle texture and a hardness between 5 and 6, with a specific gravity of 5.1.<ref name=Stieff56/> Later samples from Woodrow Mine in New Mexico collected by Moench showed fibrous internal structure and exceptional crystallization.<ref name=Moench62/> A polished thin section of coffinite has a brown color and shows anisotropic transmission of light.<ref name=Moench62/> Optical analysis yielded a refractive index of about 1.74.<ref name=Moench62/>
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