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

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	Clinozoisite	Epidote	None	Prehnite	Spinel	Staurolite

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:
Amphibole Chlorite Clay Clinozoisite Epidote None Prehnite Spinel Staurolite

8 IMA Minerals at location:

Anthophyllite ()*	Chamosite ()*	Chromite ()*	Clinochlore ()*	Clinozoisite ()*
Magnetite ()*	Prehnite ()*	Staurolite ()*

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
Anthophyllite ()*	Amphibole	Mg₂Mg₅Si₈O₂₂(OH)₂	170	170	2	286316,286318	718
Chamosite ()*	Chlorite Clay	(Fe²⁺,Mg,Al,Fe³⁺)₆(Si,Al)₄O₁₀(OH,O)₈	170	170	1	286316	577
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	170	170	13	286316,286318,286319,286320,286321,286322,286323,286324,286325,286326,286327,286328,286329	3902
Clinochlore ()*	Chlorite Clay	Mg₅Al(AlSi₃O₁₀)(OH)₈	170	170	2	286316,286318	1756
Clinozoisite ()*	Clinozoisite Epidote	Ca₂Al₃[Si₂O₇][SiO₄]O(OH)	170	170	1	286318	1025
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	170	170	2	286316,286318	14899
Prehnite ()*	Prehnite	Ca₂Al(Si₃Al)O₁₀(OH)₂	170	170	1	286316	1898
Staurolite ()*	Staurolite	Fe²⁺₂Al₉Si₄O₂₃(OH)	170	170	1	286316	978

2 Ages assigned to this locality:

	Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Source	Sample Num	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	podchrome-00483	170	170	Jurassic										Cr	18134	Ribbon Mine (Washington Chrome Mine), Green Creek, Twin Sisters Mountain, Sisters District, Whatcom Co., Washington, USA	Ribbon	Moiser et al. (2012)		USGSSIR2012_5157
	podchrome-00481	170	170	Jurassic										Cr	28911	Danny Mine (Dannie Mine; Washington Chrome Mine), Nooksack River, Twin Sisters Mountain, Sisters District, Whatcom Co., Washington, USA	Danny	Moiser et al. (2012)		USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...