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Vivianite Concretion Locality, Riva, Anne Arundel Co., Maryland, USA

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List of minerals arranged by Dana 8th Edition classification
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
A3(XO4)2·xH2O
Vivianite40.3.6.1Fe2+3(PO4)2 · 8H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Glauconite71.2.2a.5(K,Na)(Fe3+,Al,Mg)2(Si,Al,Fe3+)4O10)(OH)2
Unclassified Minerals
'Limonite'-FeO(OH) · nH2O


4 entries listed. 3 valid minerals.

References

Barwick, A. R. (1951) Vivianite concretions in the Aquia Formation (middle Eocene), Anne Arundel County, Maryland: American Mineralogist: 36 (7-8): 629-630.

Mineral and/or Locality  
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