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Manganese Biominerals (Todorokite, Romanechite, Birnessite)
Manganese Biominerals (Todorokite, Romanechite, Birnessite)
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Manganese Biominerals (Todorokite, Romanechite, Birnessite) (Ref: CHESA-01)

Chesapeake Bay, Calvert County, Maryland, USA
110mm x 30mm x 30mm
minID: F8T-FF0
$1250
This is a Manganese Biominerals (Todorokite, Romanechite, Birnessite) from Chesapeake Bay, Calvert County, Maryland, USA. 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.
Data last checked on 10th Jan 2026
From: The Arkenstone
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See Also

Manganese Biominerals (Todorokite, Romanechite, Birnessite)
Chesapeake Bay, Calvert County, Maryland, USA
$400
70mm x 10mm x 10mm
From: The Arkenstone
Manganese Biominerals (Todorokite, Romanechite, Birnessite)
Chesapeake Bay, Calvert County, Maryland, USA
$350
60mm x 40mm x 20mm
From: The Arkenstone
Todorokite
Chesapeake Bay, Calvert Co., Maryland, USA
$900
30mm x 20mm
From: The Arkenstone
Siegenite
Buick mine, Iron County, Missouri, USA
$1250
100mm x 70mm x 50mm
From: The Arkenstone
Columbite-Fe
Strickland Quarry, Collins Hill, Middlesex County, Connecticut, USA
$1250
30mm x 20mm x 10mm
From: The Arkenstone
Getchellite with Realgar and Orpiment (Type Locality)
Getchell Mine, Adam Peak, Humboldt County, Nevada, USA (Type Locality)
$1250
50mm x 40mm x 20mm
From: The Arkenstone
Quartz var Smoky with Microcline and Albite
Himalaya Mine, Gem Hill, San Diego County, California, USA
$1200
80mm x 80mm x 30mm
From: The Arkenstone
Manganese Dendrites. 1168.50 ct.
Solnhofen, Middle Franconia, Germany
$206 *
From: A Bijoux
Manganese Dendrites. 377.40 ct.
Solnhofen, Middle Franconia, Germany
$206 *
From: A Bijoux
Diopside
DeKalb, St. Lawrence Co., New York, USA
$1250
40mm x 30mm x 10mm
From: The Arkenstone
Tincalconite ps after Borax
U.S. Borax Mine, Boron, Kern Co., California, USA
$1250
80mm x 70mm x 30mm
From: The Arkenstone
Fluorite with Galena
Rogerley Mine, Frosterley, Stanhope, County Durham, England, UK
$1250
70mm x 50mm x 30mm
From: The Arkenstone
Natrolite
Boundbrook, New Jersey, USA
$1250
60mm
From: The Arkenstone
Copper (Spinel-Twinned)
Chino Mine (Santa Rita Pit; Santa Rita Mine), Santa Rita, Grant Co., New Mexico, USA
$1250
70mm x 10mm x 10mm
From: The Arkenstone
Bixbyite With Topaz
Solarwind Claim, Thomas Range (North), Thomas Range, Juab Co., Utah, USA
$1250
20mm x 20mm x 10mm
From: The Arkenstone
* price is an approximate conversion and may not be accurate.

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