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:
Frog Pond West Occurrence (J-M Reef), Stillwater Complex, Sweet Grass Co., Montana, USA

Oldest recorded age at locality: 2906
Youngest recorded age at locality: 2681

mindat Locality ID: 161558
mindat URL: http://www.mindat.org/loc-161558.html

Tectonic Settings:

Total number of sublocalities beneath "Frog Pond West Occurrence (J-M Reef), Stillwater Complex, Sweet Grass Co., Montana, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 45°27'16"N
Longitude: 110°8'18"W
Decimal Degree (lat, lon): 45.454444444444,-110.13833333333

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	Chalcopyrite	Clay	Mica	Nickeline	None	Pentlandite	Pyrite	Spinel	Talc

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 Cu Fe H K Mg Ni O S Si

Elements from minerals reported directly at this locality: Al Ca Cu Fe H K Mg Ni O S Si

Structural Groups for minerals in this locality:
Amphibole Chalcopyrite Clay Mica Nickeline None Pentlandite Pyrite Spinel Talc

8 IMA Minerals at location:

Chalcopyrite ()*	Magnetite ()*	Pentlandite ()*	Phlogopite ()*	Pyrite ()*
Pyrrhotite ()*	Talc ()*	Tremolite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	2906	2681	27198
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	2906	2681	14899
Pentlandite ()*	Pentlandite	(Ni,Fe)₉S₈	2906	2681	1512
Phlogopite ()*	Mica Clay	KMg₃(AlSi₃O₁₀)(OH)₂	2906	2681	2273
Pyrite ()*	Pyrite	FeS₂	2906	2681	39462
Pyrrhotite ()*	Nickeline	Fe₇S₈	2906	2681	9056
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂	2906	2681	3337
Tremolite ()*	Amphibole	Ca₂(Mg_5.0-4.5Fe²⁺_0.0-0.5)Si₈O₂₂(OH)₂	2906	2681	2562

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
	JP35_1717-00001	2906	2754	2830±76	Re-Os		high		81MVL217, 801M02, 355-64-556.0, 355-64-684.5, 355-		Yes				3883	Stillwater Complex, Nye, Stillwater Co., Montana, USA	Stillwater PGE deposit, Montana, USA	Lambert et al. (1994)	10.1093/petrology/35.6.1717	JP35_1717
	JP35_1717-00002	2721	2681	2701±20	Sm-Nd		high				Yes				3883	Stillwater Complex, Nye, Stillwater Co., Montana, USA	Stillwater PGE deposit, Montana, USA	Lambert et al. (1994)	10.1093/petrology/35.6.1717	JP35_1717

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...