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:
Cecil Co., Maryland, USA


mindat Locality ID: 30379
mindat URL: http://www.mindat.org/loc-30379.html

Tectonic Settings:

Total number of sublocalities beneath "Cecil Co., Maryland, USA": 31
Total number of bottom-level sublocalities: 29

Number of Child Localities: 9
Child Localities:
Elk Mills Quarry (D. M. Stoltzfus And Sons; Inc.)
Hile Works (Leslie Quarry)
John R. Harris Prospect
Marshall Sand Chrome Property
Mechanics Valley Quarry (Maryland Materials; Inc.)
North East Quarry
Port Deposit Quarry (Port Deposit Granite Company)
State Line District
Stubbs Sand-Chrome Property

Latitude: 39°39'46"N
Longitude: 76°1'43"W
Decimal Degree (lat, lon): 39.662777777778,-76.028611111111
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 As B C Ca Cr Fe H K Mg Na Ni O S Si Ti 

Elements from minerals reported directly at this locality: Al H K O Si 

Structural Groups for minerals in this locality: 
AmorphousAmphiboleAuricuprideBruciteCalciteChloriteClayCorundumFeldsparHydrotalcite
MicaMilleriteNoneOlivinePerovskitePyriteQuartzSerpentineSmectite-vermiculiteSpinel
TalcTourmaline

31 IMA Minerals at location:
Actinolite  (*)Albite  (*)Antigorite  (*)Awaruite  (*)Beidellite  (*)
Brucite  (*)Calcite  (*)Chromite  (*)Chrysotile  (*)Clinochlore  (*)
Dolomite  (*)Dravite  (*)Forsterite  (*)Heazlewoodite  (*)Hydromagnesite  (*)
Ilmenite  (*)Magnesiochromite  (*)Magnesite  (*)Magnetite  (*)Margarite  (*)
Maucherite  (*)Millerite  (*)Muscovite  (*)Opal  (*)Pyrite  (*)
Pyroaurite  (*)Quartz  (*)Schorl  (*)Talc  (*)Vermiculite  (*)
Zaratite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Actinolite  (*)Amphibole   Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)212186723419
Albite  (*)FeldsparNa(AlSi3O8)8218662,218664,218666,218667,218670,218672,218673,2186758803
Antigorite  (*)Serpentine ClayMg3Si2O5(OH)41218669708
Awaruite  (*)Auricupride PerovskiteNi3Fe1218669166
Beidellite  (*)Clay Smectite-vermiculite(Na,Ca)0.3Al2(Si,Al)4O10(OH)2·nH2O121867285
Brucite  (*)BruciteMg(OH)21218669462
Calcite  (*)CalciteCa(CO3)121867227770
Chromite  (*)SpinelFe2+Cr2O49218663,218668,218669,218673,218675,218677,218678,218680,2186813902
Chrysotile  (*)Serpentine ClayMg3Si2O5(OH)41218669951
Clinochlore  (*)Chlorite ClayMg5Al(AlSi3O10)(OH)812186691756
Dolomite  (*)NoneCaMg(CO3)212186729895
Dravite  (*)TourmalineNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)1218669648
Forsterite  (*)OlivineMg2(SiO4)12186691188
Heazlewoodite  (*)NoneNi3S21218669205
Hydromagnesite  (*)NoneMg5(CO3)4(OH)2·4H2O1218669341
Ilmenite  (*)CorundumFe2+Ti4+O312186595433
Magnesiochromite  (*)SpinelMgCr2O41218669311
Magnesite  (*)CalciteMg(CO3)3218669,218672,2186731487
Magnetite  (*)SpinelFe2+Fe3+2O4121868114899
Margarite  (*)Mica ClayCaAl2Si2Al2O10(OH)21218669168
Maucherite  (*)NoneNi11As81218669161
Millerite  (*)MilleriteNiS12186691066
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2017380
Opal  (*)AmorphousSiO2·nH2O12186722994
Pyrite  (*)PyriteFeS23218659,218669,21867239462
Pyroaurite  (*)HydrotalciteMg6Fe3+2(CO3)(OH)16·4H2O121866989
Quartz  (*)QuartzSiO25218659,218661,218669,218672,21868261156
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)12186822705
Talc  (*)Clay TalcMg3Si4O10(OH)25218662,218669,218671,218672,2186753337
Vermiculite  (*)Clay Smectite-vermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4·8H2O1218672652
Zaratite  (*)AmorphousNi3(CO3)(OH)4·4H2O121866956


No ages have been assigned to this locality yet.
SampleSource LocalityReference URL
R060796Line Pit (Lowe's Mine), State Line District, Cecil Co., Maryland, USAhttps://rruff.info/R060796

All locality data graciously provided by mindat.org

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