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 Cliffs, Calvert Co., Maryland, USA


mindat Locality ID: 263476
mindat URL: http://www.mindat.org/loc-263476.html

Tectonic Settings:

Total number of sublocalities beneath "Calvert Cliffs, Calvert Co., Maryland, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 38°24'18"N
Longitude: 76°24'36"W
Decimal Degree (lat, lon): 38.405,-76.41
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 Sr 

Elements from minerals reported directly at this locality: Al Ba Ca Fe H K Mg Mn Na O S Sr 

Structural Groups for minerals in this locality: 
CopiapiteCoronaditeCorundumMarcasiteNone

7 IMA Minerals at location:
Birnessite  (*)Copiapite  (*)Hematite  (*)Hollandite  (*)Marcasite  (*)
Romanèchite  (*)Todorokite  (*)
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+)2O4·1.5H2O0178
Copiapite  (*)CopiapiteFe2+Fe3+4(SO4)6(OH)2·20H2O0382
Hematite  (*)CorundumFe2O3014640
Hollandite  (*)CoronaditeBa(Mn4+6Mn3+2)O160243
Marcasite  (*)MarcasiteFeS205674
Romanèchite  (*)None(Ba,H2O)2(Mn4+,Mn3+)5O100312
Todorokite  (*)None(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2O0433


No ages have been assigned to this locality yet.
SampleSource LocalityReference URL

All locality data graciously provided by mindat.org

All age data...

Other copyright data...