Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org



The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.


Locality Name:
Calvert Co., Maryland, USA


mindat Locality ID: 195609
mindat URL: http://www.mindat.org/loc-195609.html

Tectonic Settings:

Total number of sublocalities beneath "Calvert Co., Maryland, USA": 8
Total number of bottom-level sublocalities: 8

Number of Child Localities: 8
Child Localities:
Calvert Cliffs
Cove Point Placer
Kaylorite Corporation Greensand Pit
Lyons Creek Diatomaceous Earth Deposit
Mackall Building Stone Quarry
Old Clay Deposit N. Of Solomons Island
Old Greensand-Diatomaceous Earth Pit
Scientists Cliffs Beach Alluvials

Latitude: 38°31'31"N
Longitude: 76°32'41"W
Decimal Degree (lat, lon): 38.525277777778,-76.544722222222
AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
This mineral's age has not yet been recorded.

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Al Ba Ca Fe H K Mg Mn Na O S Si Sr Ti Zr 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AmorphousClinozoisiteCopiapiteCoronaditeCorundumEpidoteMarcasiteNoneNot in a structural groupPyroxene
RutileSpinelStauroliteTitaniteZircon

19 IMA Minerals at location:
Birnessite  (*)Copiapite  (*)Corundum  (*)Enstatite  (*)Epidote  (*)
Hematite  (*)Hollandite  (*)Ilmenite  (*)Kyanite  (*)Magnetite  (*)
Marcasite  (*)Opal  (*)Romanèchite  (*)Rutile  (*)Spinel  (*)
Staurolite  (*)Titanite  (*)Todorokite  (*)Zircon  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Birnessite  (*)None(Na,Ca,K)0.6(Mn4+,Mn3+)2O4·1.5H2O1218580178
Copiapite  (*)CopiapiteFe2+Fe3+4(SO4)6(OH)2·20H2O1218580382
Corundum  (*)CorundumAl2O312185871797
Enstatite  (*)PyroxeneMg2Si2O61218587944
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)12185878173
Hematite  (*)CorundumFe2O3121858014640
Hollandite  (*)CoronaditeBa(Mn4+6Mn3+2)O161218580243
Ilmenite  (*)CorundumFe2+Ti4+O32218581,2185875433
Kyanite  (*)Not in a structural groupAl2OSiO412185871507
Magnetite  (*)SpinelFe2+Fe3+2O4121858714899
Marcasite  (*)MarcasiteFeS212185805674
Opal  (*)AmorphousSiO2·nH2O12185862994
Romanèchite  (*)None(Ba,H2O)2(Mn4+,Mn3+)5O101218580312
Rutile  (*)RutileTiO22218581,2185875614
Spinel  (*)SpinelMgAl2O412185871934
Staurolite  (*)StauroliteFe2+2Al9Si4O23(OH)1218587978
Titanite  (*)TitaniteCaTi(SiO4)O12185874899
Todorokite  (*)None(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2O1218580433
Zircon  (*)ZirconZr(SiO4)2218581,2185875251


No ages have been assigned to this locality yet.
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All locality data graciously provided by mindat.org

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