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:
Schoonmaker Mine (Cramer Mine), Strickland Pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USA

Oldest recorded age at locality: 235
Youngest recorded age at locality: 227

mindat Locality ID: 21607
mindat URL: http://www.mindat.org/loc-21607.html

Tectonic Settings:

Total number of sublocalities beneath "Schoonmaker Mine (Cramer Mine), Strickland Pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 41°35'34"N
Longitude: 72°35'31"W
Decimal Degree (lat, lon): 41.592777777778,-72.591944444444
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 B Be C Ca F Fe H K Li Mg Mn Na O P S Si U Zn 

Elements from minerals reported directly at this locality: Al B Be C Ca F Fe H K Li Mg Mn Na O P S Si U Zn 

Structural Groups for minerals in this locality: 
AmphiboleApatiteAragoniteBerylCalciteClayEpidoteFeldsparFluoriteGarnet
HalotrichiteMicaNoneNot in a structural groupOlivinePyritePyroxeneQuartzSphaleriteTourmaline

27 IMA Minerals at location:
Actinolite  (*)Albite  (*)Almandine  (*)Annite  (*)Aragonite  (*)
Bertrandite  (*)Beryl  (*)Calcite  (*)Cordierite  (*)Diopside  (*)
Elbaite  (*)Fluorapatite  (*)Fluorite  (*)Grossular  (*)Lithiophilite  (*)
Microcline  (*)Montebrasite  (*)Muscovite  (*)Pickeringite  (*)Pyrite  (*)
Quartz  (*)Rhodochrosite  (*)Schorl  (*)Sphalerite  (*)Spodumene  (*)
Uraninite  (*)Zoisite  (*)
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)223522703419
Albite  (*)FeldsparNa(AlSi3O8)23522708803
Almandine  (*)GarnetFe2+3Al2(SiO4)323522702353
Annite  (*)Mica ClayKFe2+3(AlSi3O10)(OH)22352270356
Aragonite  (*)AragoniteCa(CO3)23522703250
Bertrandite  (*)Not in a structural groupBe4Si2O7(OH)22352270606
Beryl  (*)BerylBe3Al2Si6O1823522704286
Calcite  (*)CalciteCa(CO3)235227027770
Cordierite  (*)BerylMg2Al4Si5O1823522701008
Diopside  (*)PyroxeneCaMgSi2O623522704135
Elbaite  (*)TourmalineNa(Al1.5Li1.5)Al6(Si6O18)(BO3)3(OH)3(OH)2352270520
Fluorapatite  (*)ApatiteCa5(PO4)3F23522702740
Fluorite  (*)FluoriteCaF223522709617
Grossular  (*)GarnetCa3Al2(SiO4)323522701544
Lithiophilite  (*)OlivineLiMn2+(PO4)2352270155
Microcline  (*)FeldsparK(AlSi3O8)23522704924
Montebrasite  (*)NoneLiAl(PO4)(OH)2352270200
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2235227017380
Pickeringite  (*)HalotrichiteMgAl2(SO4)4·22H2O2352270265
Pyrite  (*)PyriteFeS2235227039462
Quartz  (*)QuartzSiO2235227061156
Rhodochrosite  (*)CalciteMn(CO3)23522701711
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)23522702705
Sphalerite  (*)SphaleriteZnS235227021482
Spodumene  (*)PyroxeneLiAlSi2O62352270688
Uraninite  (*)FluoriteUO223522702718
Zoisite  (*)EpidoteCa2Al3[Si2O7][SiO4]O(OH)23522701025


1 Ages assigned to this locality:

Excel IDMax Age (Ma)Min Age (Ma)Age as listed in referenceDating MethodAge InterpretPrioritized?Sample SourceSample NumRun NumAge from other LocalityDated MineralMinerals explicitely stated as having this ageAge applies to these ElementsMinDat Locality IDDated Locality (Max Age)Location as listed in referenceReferenceReference DOIReference IDAge Notes
Alexandra-0276235227231±4Rb-SrAge of pegmatite   Yes  217860Strickland Pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USAStrickland pegmatiteBrookins et al. (1969)10.1007/BF00372402CMP22_157 

SampleSource LocalityReference URL

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