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Vivianite Concretion Locality, Riva, Anne Arundel Co., Maryland, USAi
Regional Level Types
Vivianite Concretion Locality- not defined -
Riva- not defined -
Anne Arundel Co.County
MarylandState
USACountry

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Latitude & Longitude (WGS84): 38° 57' 58'' North , 76° 38' 2'' West
Latitude & Longitude (decimal): 38.96611,-76.63389
GeoHash:G#: dqct8jsfh
Köppen climate type:Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Davidsonville8,000 (2013)4.8km
Riva4,076 (2011)5.1km
Crofton27,348 (2011)6.1km
Edgewater9,023 (2011)7.3km
Crownsville1,757 (2011)7.5km


Road cut along Tarnans Branch of the South River near the south bluff on Tarnans Branch, near the Rutland School Road Underpass of the expressway. Phosphate concretions to 20 cm in diameter were found about 1950. The vivianite either displays several different colors or there are several phosphates species present.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


3 valid minerals.

Detailed Mineral List:

Glauconite
Formula: (K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
Reference: Barwick, Authur R. (1951) Vivianite Concretions in Aquia Formation (Middle Eocene), Anne Arundel County, Maryland, American Mineralogist, 36: 629--630.
Goethite
Formula: α-Fe3+O(OH)
Reference: Barwick, Authur R. (1951) Vivianite Concretions in Aquia Formation (Middle Eocene), Anne Arundel County, Maryland, American Mineralogist, 36: 629--630.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Barwick, Authur R. (1951) Vivianite Concretions in Aquia Formation (Middle Eocene), Anne Arundel County, Maryland, American Mineralogist, 36: 629--630.
Vivianite
Formula: Fe2+3(PO4)2 · 8H2O
Reference: Barwick, Authur R. (1951) Vivianite Concretions in Aquia Formation (Middle Eocene), Anne Arundel County, Maryland, American Mineralogist, 36: 629--630.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Group 8 - Phosphates, Arsenates and Vanadates
Vivianite8.CE.40Fe2+3(PO4)2 · 8H2O
Unclassified Minerals, Rocks, etc.
Glauconite-(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
'Limonite'-(Fe,O,OH,H2O)

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)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
Unclassified Minerals, Mixtures, etc.
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H Goethiteα-Fe3+O(OH)
H Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
H Limonite(Fe,O,OH,H2O)
H VivianiteFe32+(PO4)2 · 8H2O
OOxygen
O Goethiteα-Fe3+O(OH)
O Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
O Limonite(Fe,O,OH,H2O)
O VivianiteFe32+(PO4)2 · 8H2O
NaSodium
Na Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
MgMagnesium
Mg Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
AlAluminium
Al Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
SiSilicon
Si Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
PPhosphorus
P VivianiteFe32+(PO4)2 · 8H2O
KPotassium
K Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
FeIron
Fe Goethiteα-Fe3+O(OH)
Fe Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
Fe Limonite(Fe,O,OH,H2O)
Fe VivianiteFe32+(PO4)2 · 8H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Miocene
5.333 - 23.03 Ma



ID: 3192743
Cenozoic sedimentary rocks

Age: Miocene (5.333 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Paleocene
56 - 66 Ma



ID: 2947558
Pamunkey Group; Aquia Formation

Age: Paleocene (56 - 66 Ma)

Stratigraphic Name: Aquia Formation

Description: Dark green to gray-green, argillaceous, highly glauconitic, well-sorted fine- to medium-grained sand; locally indurated shell beds; thickness 0 to 100 feet.

Comments: Original map source: In 1995 the Water Resources Division of the U.S. Geological Survey digitized the geologic map of Maryland from the 1968 paper map (Reference MD001). Information about products from the Maryland Geological Survey can be found at http://www.mgs.md.gov/.

Lithology: Major:{sand}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

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


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