The new mineral described in this paper was found by J. B. Tenney at the Higgins Mine, Bisbee, Arizona and was sent to the Harvard Mineralogical Museum for determination in 1917. Mr. Tenney, then Chief Geologist of the Phelps-Dodge Corporation, described the occurrence of the mineral in the following words: —“The mineral occurs always with manganese ore on or near the surface. The manganese minerals are psilomelane, brau-nite and pyrolusite. Occasionally barite occurs with it also, and the manganese passes on the edge of the deposits into limonite (or goethite) intergrown with cherty quartz, or into crystalline limestone. The form and nature of the occurrence suggest replacement of pure limestone by manganese, iron and silica, carried in strong sulfate solutions. The green mineral appears to be of the same age, as far as can be told.”

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