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Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada Self collected by Modris Baum April 1998. FOV 1.3 x 1.6. This is a pseudomorph of birnessite and rancieite after serandite. Thanks to Lazslo Horvath for the information regarding rancieite. A few more birnessite/rancieite pseudomorphs at: http://mysite.verizon.net/vzey5wva/alkaliseltzer/ The child photo is a stereo view. |
| Photo ID: 168853 View Count: 118 | |
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Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada FOV 2.6 x 2.8 mm. Collected by Modris B. ca 1997. Pseudomorph of birnessite/rancieite after serandite. (Thanks to Laszlo Horvath for information regarding the rancieite.) Most such PS at STA are jet black. Perhaps this one has not yet altered completely. The microcline is white. Aegirine tufts are olive brown. Stereo child photo. |
| Photo ID: 187140 View Count: 88 | |
Birnessite : (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O | |
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Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada Photographed by and in the collection of Doug Merson. |
| © 2005 DM | Photo ID: 31856 View Count: 584 |
Birnessite : (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O | |
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Das Aufgeklärte Glück Mine, Hasserode, Wernigerode, Harz Mts, Saxony-Anhalt, Germany Gray birnessite, very small crystals and massive. Picture size 7 mm. Photographer and collection Thomas Witzke. |
| © Thomas Witzke | Photo ID: 8240 View Count: 624 |
Birnessite : (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O | |
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Teineholmen, Barkevik (Barkevika), Langesundsfjorden, Larvik, Vestfold, Norway Brownish black pseudomorphs of Birnessite after bladed crystals of an Astrophyllite-group mineral embedded in Natrolite from Teineholmen, Barkevik, Langesundsfjorden, Norway. Field of view: 2 cm. Specimen and photo: Knut Eldjarn. |
| © Knut Eldjarn | Photo ID: 104818 View Count: 341 |
Birnessite : (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O, Todorokite : (Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)6O12·3H2O | |
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KCON claim, USA-4, Clarion-Clipperton Zone, Pacific Ocean A 2.5 cm nodule consisting of intermixed birnessite and todorokite, recovered from approximately 4570 meters. S271-06 Excalibur Mineral specimen. |
| © 2008, JGW | Photo ID: 146952 View Count: 146 |
Birnessite : (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O, Ussingite : Na2AlSi3O8OH | |
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Karnasurt Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia Black, prismatic crystal in ussingite. Specimen size 4x2.5 cm. |
| © B. Otter | Photo ID: 23578 View Count: 475 |
Birnessite : (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O, Connellite : Cu19[(OH)32|SO4|Cl4] · 3H2O | |
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Penberthy Croft Mine (Wheal Fancy), St Hilary, Mount's Bay District, Cornwall, England, UK Black glossy coatings of birnessite with blue connellite, 20mm across. John Betterton specimen. |
| © David Green | Photo ID: 574 View Count: 861 |
Birnessite : (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O | |
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Boron, Kramer District, Kern Co., California, USA dimension area mm. 4 x 4 |
| © luigi chiappino | Photo ID: 201816 View Count: 54 |
Birnessite : (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O | |
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300(-foot) level, Gold Hill Mine (Western Utah Mine), Gold Hill, Gold Hill District (Clifton District), Deep Creek Mts, Tooele Co., Utah, USA Botryoidal mass of birnessite on calcite. From a small cave in the 300' level of the mine. Field of view, 0.75mm x 0.75mm. Brent Thorne specimen and photograph. |
| © Brent Thorne | Photo ID: 70108 View Count: 228 |
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