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:
Sisters District, Whatcom Co., Washington, USA

Oldest recorded age at locality: 170
Youngest recorded age at locality: 170

mindat Locality ID: 31316
mindat URL: http://www.mindat.org/loc-31316.html

Tectonic Settings:

Total number of sublocalities beneath "Sisters District, Whatcom Co., Washington, USA": 16
Total number of bottom-level sublocalities: 13

Number of Child Localities: 1
Child Localities:
Twin Sisters Mountain

Latitude: 48°42'19"N
Longitude: 121°57'9"W
Decimal Degree (lat, lon): 48.705277777778,-121.9525
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 Ca Cr Fe H Mg O Si 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AmphiboleChloriteClayClinozoisiteEpidoteNonePrehniteSpinelStaurolite

8 IMA Minerals at location:
Anthophyllite  (*)Chamosite  (*)Chromite  (*)Clinochlore  (*)Clinozoisite  (*)
Magnetite  (*)Prehnite  (*)Staurolite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Anthophyllite  (*)Amphibole   Mg2Mg5Si8O22(OH)21701702286316,286318718
Chamosite  (*)Chlorite Clay(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)81701701286316577
Chromite  (*)SpinelFe2+Cr2O417017013286316,286318,286319,286320,286321,286322,286323,286324,286325,286326,286327,286328,2863293902
Clinochlore  (*)Chlorite ClayMg5Al(AlSi3O10)(OH)81701702286316,2863181756
Clinozoisite  (*)Clinozoisite EpidoteCa2Al3[Si2O7][SiO4]O(OH)17017012863181025
Magnetite  (*)SpinelFe2+Fe3+2O41701702286316,28631814899
Prehnite  (*)PrehniteCa2Al(Si3Al)O10(OH)217017012863161898
Staurolite  (*)StauroliteFe2+2Al9Si4O23(OH)1701701286316978


2 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
podchrome-00483170170Jurassic       Cr18134Ribbon Mine (Washington Chrome Mine), Green Creek, Twin Sisters Mountain, Sisters District, Whatcom Co., Washington, USARibbonMoiser et al. (2012) USGSSIR2012_5157 
podchrome-00481170170Jurassic       Cr28911Danny Mine (Dannie Mine; Washington Chrome Mine), Nooksack River, Twin Sisters Mountain, Sisters District, Whatcom Co., Washington, USADannyMoiser et al. (2012) USGSSIR2012_5157 

All locality data graciously provided by mindat.org

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