Manganese Biominerals (Todorokite, Romanechite, Birnessite)
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The ArkenstoneFeatured
Chesapeake biominerals, including Hollandite, Todorokite, Romanechite, Birnessite, and other unusual manganese and iron species, form when metal-rich subsurface waters emerge from the face of the cliffs along the western shore of Chesapeake Bay. Microbes exploit the chemical richness of the waters by oxidizing the metals and precipitating minerals in beautifully sculpted masses. The resulting specimens containing mixed amounts of these related species, such as those you see here, are among the finest examples of their style anywhere in the world and are unique in their aesthetic appeal and scientific interest. A portion of all sales goes to support the study of Chesapeake Bay geology through the laboratory of Dr. Robert Hazen.
Product details
SpeciesManganese, Romanechite
SizeSmall Cabinet
Dimensions7.4 x 1.8 x 1.4 cm
Listed on04/09/2026
LocalityChesapeake Bay
SKUCHESA-04
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Mineral guide
Learn about Manganese
Native manganese a rare native-element specimen prized by advanced collectors for its silvery luster, tiny grains, and provenance; misidentifications lower val…Regional guide
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