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:
Chouteau Co., Montana, USA

Oldest recorded age at locality: 56.6
Youngest recorded age at locality: 42

mindat Locality ID: 30678
mindat URL: http://www.mindat.org/loc-30678.html

Tectonic Settings:

Total number of sublocalities beneath "Chouteau Co., Montana, USA": 15
Total number of bottom-level sublocalities: 14

Number of Child Localities: 11
Child Localities:
Big Lake Deposits
Highwood Mts
Number One Prospect
Rocky Boy Stock Occurrence
United Petroleum Good 1 Prospect
Unnamed Bentonite Deposit (MRDS - 10149062)
Unnamed Clay Deposit (MRDS - 10173271)
Unnamed Clay Deposit (MRDS - 10293864)
Unnamed Stone - Crushed/Broken Occurrence (MRDS - 10221163)
Virgelle Sandstone
White Lake Occurrence

Latitude: 47°57'50"N
Longitude: 110°12'44"W
Decimal Degree (lat, lon): 47.963888888889,-110.21222222222

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.

Analcime	Apatite	Calcite	Cancrinite-sodalite	Clay	Feldspar	Mica	Natrolite	None	Olivine
Pyroxene	Sodalite	Spinel	Titanite	Tridymite

Aegirine ()*	Analcime ()*	Augite ()*	Calcite ()*	Fluorapatite ()*
Forsterite ()*	Leucite ()*	Magnetite ()*	Natrolite ()*	Nepheline ()*
Orthoclase ()*	Phlogopite ()*	Sanidine ()*	Sodalite ()*	Titanite ()*

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 C Ca Cl F Fe H K Mg Na O P Si Ti

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Analcime Apatite Calcite Cancrinite-sodalite Clay Feldspar Mica Natrolite None Olivine
Pyroxene Sodalite Spinel Titanite Tridymite

15 IMA Minerals at location:

Mineral name	Structural Groups	IMA Formula	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Aegirine ()*	Pyroxene	NaFe³⁺Si₂O₆	1	227688	1022
Analcime ()*	Analcime	Na(AlSi₂O₆)·H₂O	1	227685	1627
Augite ()*	Pyroxene	(Ca,Mg,Fe)₂Si₂O₆	2	227688,227689	2060
Calcite ()*	Calcite	Ca(CO₃)	1	227685	27770
Fluorapatite ()*	Apatite	Ca₅(PO₄)₃F	1	227688	2740
Forsterite ()*	Olivine	Mg₂(SiO₄)	1	227688	1188
Leucite ()*	Analcime	K(AlSi₂O₆)	1	227685	233
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	1	227688	14899
Natrolite ()*	Natrolite	Na₂(Si₃Al₂)O₁₀·2H₂O	2	227685,227688	1236
Nepheline ()*	Tridymite	Na₃K(Al₄Si₄O₁₆)	1	227688	884
Orthoclase ()*	Feldspar	K(AlSi₃O₈)	1	227685	2349
Phlogopite ()*	Mica Clay	KMg₃(AlSi₃O₁₀)(OH)₂	1	227687	2273
Sanidine ()*	Feldspar	K(AlSi₃O₈)	2	227686,227688	598
Sodalite ()*	Cancrinite-sodalite Sodalite	Na₄(Si₃Al₃)O₁₂Cl	1	227688	444
Titanite ()*	Titanite	CaTi(SiO₄)O	1	227688	4899

8 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Sample Num	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference ID
NAVDAT-29745	56.6	48.4	52.5±4.1		29745	163730	Number One Prospect, Chouteau Co., Montana, USA		NAVDAT	NAVDAT
NAVDAT-29739	56.6	48.4	52.5±4.1		29739	164301	Rocky Boy Stock Occurrence, Chouteau Co., Montana, USA		NAVDAT	NAVDAT
NAVDAT-29741	56.6	48.4	52.5±4.1		29741	164301	Rocky Boy Stock Occurrence, Chouteau Co., Montana, USA		NAVDAT	NAVDAT
NAVDAT-29744	56.6	48.4	52.5±4.1		29744	164301	Rocky Boy Stock Occurrence, Chouteau Co., Montana, USA		NAVDAT	NAVDAT
NAVDAT-29746	56.6	48.4	52.5±4.1		29746	164301	Rocky Boy Stock Occurrence, Chouteau Co., Montana, USA		NAVDAT	NAVDAT
NAVDAT-30339	54	42	48±6		30339	164301	Rocky Boy Stock Occurrence, Chouteau Co., Montana, USA		NAVDAT	NAVDAT
NAVDAT-30340	54	42	48±6		30340	164301	Rocky Boy Stock Occurrence, Chouteau Co., Montana, USA		NAVDAT	NAVDAT
ree-00654	55	49	Eocene-- 49-55 Ma (K-Ar)	K-Ar		164301	Rocky Boy Stock Occurrence, Chouteau Co., Montana, USA	Bearpaw Mountains (Rocky Boy)	Orris and Grauch (2002)	USGSOFR02_189

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...