ramsdellite

ramsdellite

[′ramz·de‚līt]
(mineralogy)
MnO2 An orthorhombic mineral composed of manganese dioxide; it is dimorphous with pyrolusite.
References in periodicals archive ?
Ramsdellite has been identified on only two specimens from Ilfeld.
The new strike of ramsdellite made in November 2008 at the Mistake mine, Yavapai County, Arizona, produced something like 30 flats of thumbnail and miniature specimens, much better on average than the ramsdellite specimens which were dug and marketed in the 1990s by the late Dave Shannon.
Native gold was also reported in the oxidized zones of the silver-rich veins themselves, together with cryptomelane, ramsdellite, romanechite, native silver, and small amounts of chlorargyrite (Meyer et al.