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Additional recommended knowledge
Coffinite is a poor ore mineral of uranium.
It is a glass-like black material, dark brown or pale-brown in color, possibly with grayish black streaks. It is named for American geologist Reuben Clare Coffin. It has molecular weight 327.71 daltons. It has no good cleavages and a brittle fracture. It is black with a black streak. The hardness of coffinite is between 5 and 6.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Coffinite". A list of authors is available in Wikipedia.|