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:
Twin Sisters Mountain, Whatcom Co., Washington, USA

Oldest recorded age at locality: 170
Youngest recorded age at locality: 0.276

mindat Locality ID: 17381
mindat URL: http://www.mindat.org/loc-17381.html

Tectonic Settings:

Total number of sublocalities beneath "Twin Sisters Mountain, Whatcom Co., Washington, USA": 32
Total number of bottom-level sublocalities: 25

Number of Child Localities: 16
Child Localities:
Alaska Claim
Bates And Kraemer Claim
Government Claim
Green Creek
Harrington Claim
Hildebrand Lake
Joan Claim
Nooksack River
Rainbow Claim
Second Basin
Seymour Creek
Sister Creek
Skookum Creek
Twin Lakes
Willie Claim
Zoanne Claim

Latitude: 48°41'42"N
Longitude: 121°57'26"W
Decimal Degree (lat, lon): 48.695,-121.95722222222

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The 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.

Amphibole	Chlorite	Clay	Feldspar	Garnet	None	Pyroxene	Sepiolite	Spinel

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 Na O Si

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

Structural Groups for minerals in this locality:
Amphibole Chlorite Clay Feldspar Garnet None Pyroxene Sepiolite Spinel

8 IMA Minerals at location:

Albite ()*	Anthophyllite ()*	Chromite ()*	Clinochlore ()*	Diopside ()*
Enstatite ()*	Sepiolite ()*	Uvarovite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Albite ()*	Feldspar	Na(AlSi₃O₈)			1	286394	8803
Anthophyllite ()*	Amphibole	Mg₂Mg₅Si₈O₂₂(OH)₂	170	0.276	0		718
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	170	0.276	23	286365,286366,286369,286370,286372,286373,286374,286376,286377,286379,286381,286383,286384,286385,286386,286387,286389,286390,286391,286392,286393,286395,286396	3902
Clinochlore ()*	Chlorite Clay	Mg₅Al(AlSi₃O₁₀)(OH)₈			1	286372	1756
Diopside ()*	Pyroxene	CaMgSi₂O₆			1	286394	4135
Enstatite ()*	Pyroxene	Mg₂Si₂O₆	170	0.276	0		944
Sepiolite ()*	Sepiolite Clay	Mg₄Si₆O₁₅(OH)₂·6H₂O	170	0.276	0		241
Uvarovite ()*	Garnet	Ca₃Cr₂(SiO₄)₃			1	286372	212

8 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Sample Source	Sample Num	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference ID
podchrome-00479	170	170	Jurassic			Cr	68896	Bumper Claim, Green Creek, Twin Sisters Mountain, Whatcom Co., Washington, USA	Bumper	Moiser et al. (2012)	USGSSIR2012_5157
NAVDAT-75494	0.316	0.276	0.296±0.02	whole rock	75494		68908	Harrington Claim, Twin Sisters Mountain, Whatcom Co., Washington, USA		NAVDAT	NAVDAT
NAVDAT-75495	0.513	0.477	0.495±0.018	whole rock	75495		68908	Harrington Claim, Twin Sisters Mountain, Whatcom Co., Washington, USA		NAVDAT	NAVDAT
NAVDAT-75496	0.513	0.477	0.495±0.018	whole rock	75496		68908	Harrington Claim, Twin Sisters Mountain, Whatcom Co., Washington, USA		NAVDAT	NAVDAT
NAVDAT-75498	0.513	0.477	0.495±0.018	whole rock	75498		68908	Harrington Claim, Twin Sisters Mountain, Whatcom Co., Washington, USA		NAVDAT	NAVDAT
NAVDAT-75499	0.513	0.477	0.495±0.018	whole rock	75499		68908	Harrington Claim, Twin Sisters Mountain, Whatcom Co., Washington, USA		NAVDAT	NAVDAT
podchrome-00480	170	170	Jurassic			Cr	68898	Cultus Claim, Skookum Creek, Twin Sisters Mountain, Whatcom Co., Washington, USA	Cultus	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00484	170	170	Jurassic			Cr	68928	Sisters Claim, Skookum Creek, Twin Sisters Mountain, Whatcom Co., Washington, USA	Sisters	Moiser et al. (2012)	USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...