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:
Snoqualmie Pass, Snoqualmie District, King Co., Washington, USA


mindat Locality ID: 23895
mindat URL: http://www.mindat.org/loc-23895.html

Tectonic Settings:

Total number of sublocalities beneath "Snoqualmie Pass, Snoqualmie District, King Co., Washington, USA": 9
Total number of bottom-level sublocalities: 8

Number of Child Localities: 8
Child Localities:
Carmack Mine
Chair Peak Area
Dutch Miller Gap
Guye Mine (Mount Logan Mine; Summit Mine)
Mount Hinman
Mount Roosevelt
Silver Peak
Source Lake

Latitude: 47°27'55"N
Longitude: 121°23'40"W
Decimal Degree (lat, lon): 47.465277777778,-121.39444444444
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 Ca Cu Fe H Mg Mn Na O Pb S Si Ti Zn 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AmphiboleChalcopyriteChloriteClayClinozoisiteDumortieriteEpidoteGarnetNatroliteNone
Not in a structural groupPrehnitePyriteQuartzRocksaltSphaleriteSpinelTitaniteTourmaline

17 IMA Minerals at location:
Actinolite  (*)Anatase  (*)Andradite  (*)Chalcopyrite  (*)Dumortierite  (*)
Epidote  (*)Galena  (*)Grossular  (*)Magnetite  (*)Natrolite  (*)
Pennantite  (*)Prehnite  (*)Pyrite  (*)Quartz  (*)Schorl  (*)
Sphalerite  (*)Titanite  (*)
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)212845703419
Anatase  (*)Not in a structural groupTiO212845752162
Andradite  (*)GarnetCa3Fe3+2(SiO4)312845701534
Chalcopyrite  (*)ChalcopyriteCuFeS2128456927198
Dumortierite  (*)DumortieriteAlAl6BSi3O181284571231
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)2284572,2845748173
Galena  (*)RocksaltPbS2284569,28457224243
Grossular  (*)GarnetCa3Al2(SiO4)312845721544
Magnetite  (*)SpinelFe2+Fe3+2O43284570,284572,28457414899
Natrolite  (*)NatroliteNa2(Si3Al2)O10·2H2O12845741236
Pennantite  (*)Chlorite ClayMn2+5Al(Si3Al)O10(OH)8128457725
Prehnite  (*)PrehniteCa2Al(Si3Al)O10(OH)212845741898
Pyrite  (*)PyriteFeS22284572,28457539462
Quartz  (*)QuartzSiO25284570,284571,284574,284575,28457761156
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)2284571,2845742705
Sphalerite  (*)SphaleriteZnS128457221482
Titanite  (*)TitaniteCaTi(SiO4)O12845744899


No ages have been assigned to this locality yet.
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