Mineral Evolution Database

Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.

Mineral locality data provided by mindat.org

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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:
Hill Co., Montana, USA

Oldest recorded age at locality: 83.6
Youngest recorded age at locality: 42

mindat Locality ID: 30949
mindat URL: http://www.mindat.org/loc-30949.html

Tectonic Settings:

Total number of sublocalities beneath "Hill Co., Montana, USA": 11
Total number of bottom-level sublocalities: 9

Number of Child Localities: 6
Child Localities:
Bearpaw Mts
Havre
Nepheline Occurrences
Rainbow Claims
Rocky Boy Stock Occurrence
Unnamed Uranium - Zinc - Niobium (Columbium) - Copper - Lead - Zirconium - Titanium - Metal Occurrence (Vermiculite Prospect; MRDS - 10019371)

Latitude: 48°14'35"N
Longitude: 109°40'29"W
Decimal Degree (lat, lon): 48.243055555556,-109.67472222222

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	Analcime	Ancylite	Apatite	Aragonite	Baryte	Bastnäsite	Burbankite	Calcite	Cancrinite
Cancrinite-sodalite	Chalcopyrite	Chevkinite	Clay	Clinozoisite	Coronadite	Corundum	Crichtonite	Diaspore	Epidote
Eudialyte	Feldspar	Gadolinite	Gypsum	Mica	Natrolite	Nickeline	None	Not in a structural group	Oxalate
Perovskite	Prehnite	Pyrite	Pyroxene	Quartz	Rocksalt	Rutile	Sodalite	Spinel	Tetrahedrite
Thomsonite	Titanite	Tridymite	Zircon

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 B Ba C Ca Ce Cl Cr Cu F Fe H K La Mg Mn Na Nb O P Pb S Sb Si Sr Th Ti U V Y Zr

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Amphibole Analcime Ancylite Apatite Aragonite Baryte Bastnäsite Burbankite Calcite Cancrinite
Cancrinite-sodalite Chalcopyrite Chevkinite Clay Clinozoisite Coronadite Corundum Crichtonite Diaspore Epidote
Eudialyte Feldspar Gadolinite Gypsum Mica Natrolite Nickeline None Not in a structural group Oxalate
Perovskite Prehnite Pyrite Pyroxene Quartz Rocksalt Rutile Sodalite Spinel Tetrahedrite
Thomsonite Titanite Tridymite Zircon

57 IMA Minerals at location:

Actinolite ()*	Aegirine ()*	Albite ()*	Analcime ()*	Anatase ()*
Ancylite-(Ce) ()*	Annite ()*	Aragonite ()*	Augite ()*	Baryte ()*
Barytolamprophyllite ()*	Bastnäsite-(Ce) ()*	Burbankite ()*	Calcite ()*	Calkinsite-(Ce) ()*
Cancrinite ()*	Chalcopyrite ()*	Chevkinite-(Ce) ()*	Crichtonite ()*	Datolite ()*
Epidote ()*	Eudialyte ()*	Fluorapatite ()*	Galena ()*	Gibbsite ()*
Goethite ()*	Gypsum ()*	Hastingsite ()*	Henrymeyerite ()*	Ilmenite ()*
Lamprophyllite ()*	Leucite ()*	Loparite-(Ce) ()*	Magnetite ()*	Microcline ()*
Muscovite ()*	Natrolite ()*	Nepheline ()*	Orthoclase ()*	Perovskite ()*
Phlogopite ()*	Prehnite ()*	Priderite ()*	Pyrite ()*	Pyrophanite ()*
Pyrrhotite ()*	Quartz ()*	Rutile ()*	Sanidine ()*	Sodalite ()*
Strontiochevkinite ()*	Tetrahedrite-(Zn) ()*	Thomsonite-Ca ()*	Thorite ()*	Titanite ()*
Whewellite ()*	Zircon ()*

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
Actinolite ()*	Amphibole	Ca₂(Mg_4.5-2.5Fe²⁺_0.5-2.5)Si₈O₂₂(OH)₂			1	228970	3419
Aegirine ()*	Pyroxene	NaFe³⁺Si₂O₆	56.6	42	3	228972,228973,228977	1022
Albite ()*	Feldspar	Na(AlSi₃O₈)			1	228970	8803
Analcime ()*	Analcime	Na(AlSi₂O₆)·H₂O			2	228970,228973	1627
Anatase ()*	Not in a structural group	TiO₂			1	228968	2162
Ancylite-(Ce) ()*	Ancylite	CeSr(CO₃)₂(OH)·H₂O			2	228968,228973	92
Annite ()*	Mica Clay	KFe²⁺₃(AlSi₃O₁₀)(OH)₂			1	228973	356
Aragonite ()*	Aragonite	Ca(CO₃)	83.6	72.1	1	228974	3250
Augite ()*	Pyroxene	(Ca,Mg,Fe)₂Si₂O₆			1	228968	2060
Baryte ()*	Baryte	Ba(SO₄)	56.6	42	3	228968,228972,228977	11547
Barytolamprophyllite ()*	None	(BaK)Ti₂Na₃Ti(Si₂O₇)₂O₂(OH)₂			1	228973	21
Bastnäsite-(Ce) ()*	Bastnäsite	Ce(CO₃)F			2	228968,228973	304
Burbankite ()*	Burbankite	(Na,Ca)₃(Sr,Ba,Ce)₃(CO₃)₅	56.6	42	2	228972,228977	52
Calcite ()*	Calcite	Ca(CO₃)	83.6	42	4	228970,228972,228974,228977	27770
Calkinsite-(Ce) ()*	None	Ce₂(CO₃)₃·4H₂O	56.6	42	2	228972,228977	8
Cancrinite ()*	Cancrinite	(Na,Ca, )₈(Al₆Si₆)O₂₄(CO₃,SO₄)₂·2H₂O			1	228968	232
Chalcopyrite ()*	Chalcopyrite	CuFeS₂			2	228969,228972	27198
Chevkinite-(Ce) ()*	Chevkinite	Ce₄(Ti,Fe²⁺,Fe³⁺)₅O₈(Si₂O₇)₂			2	228968,228973	89
Crichtonite ()*	Crichtonite	Sr(Mn,Y,U)Fe₂(Ti,Fe,Cr,V)₁₈(O,OH)₃₈			1	228973	27
Datolite ()*	Gadolinite	CaB(SiO₄)(OH)			1	228970	498
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)			1	228970	8173
Eudialyte ()*	Eudialyte	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂			1	228968	182
Fluorapatite ()*	Apatite	Ca₅(PO₄)₃F			1	228973	2740
Galena ()*	Rocksalt	PbS			3	228969,228970,228972	24243
Gibbsite ()*	None	Al(OH)₃			1	228973	504
Goethite ()*	Diaspore	FeO(OH)			1	228972	7437
Gypsum ()*	Gypsum	Ca(SO₄)·2H₂O	83.6	72.1	1	228974	6890
Hastingsite ()*	Amphibole	NaCa₂(Fe²⁺₄Fe³⁺)(Si₆Al₂)O₂₂(OH)₂			1	228970	209
Henrymeyerite ()*	Coronadite	Ba(Ti₇Fe²⁺)O₁₆			1	228973	9
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃			2	228972,228973	5433
Lamprophyllite ()*	None	(SrNa)Ti₂Na₃Ti(Si₂O₇)₂O₂(OH)₂			2	228968,228973	63
Leucite ()*	Analcime	K(AlSi₂O₆)			1	228968	233
Loparite-(Ce) ()*	Perovskite	(Na,Ce,Sr)(Ce,Th)(Ti,Nb)₂O₆			1	228973	57
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			2	228970,228973	14899
Microcline ()*	Feldspar	K(AlSi₃O₈)			1	228973	4924
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂			1	228973	17380
Natrolite ()*	Natrolite	Na₂(Si₃Al₂)O₁₀·2H₂O			1	228973	1236
Nepheline ()*	Tridymite	Na₃K(Al₄Si₄O₁₆)			1	228973	884
Orthoclase ()*	Feldspar	K(AlSi₃O₈)			1	228968	2349
Perovskite ()*	Perovskite	CaTiO₃			2	228968,228978	495
Phlogopite ()*	Mica Clay	KMg₃(AlSi₃O₁₀)(OH)₂			1	228973	2273
Prehnite ()*	Prehnite	Ca₂Al(Si₃Al)O₁₀(OH)₂			1	228970	1898
Priderite ()*	Coronadite	K(Ti₇Fe³⁺)O₁₆			1	228973	41
Pyrite ()*	Pyrite	FeS₂			4	228969,228970,228972,228978	39462
Pyrophanite ()*	Corundum	Mn²⁺TiO₃			2	228968,228973	244
Pyrrhotite ()*	Nickeline	Fe₇S₈			4	228968,228969,228972,228978	9056
Quartz ()*	Quartz	SiO₂			1	228968	61156
Rutile ()*	Rutile	TiO₂			2	228968,228973	5614
Sanidine ()*	Feldspar	K(AlSi₃O₈)			2	228968,228972	598
Sodalite ()*	Cancrinite-sodalite Sodalite	Na₄(Si₃Al₃)O₁₂Cl			1	228968	444
Strontiochevkinite ()*	Chevkinite	(Sr,Ce,La)₄Fe²⁺(Ti,Zr)₄O₈(Si₂O₇)₂			1	228973	3
Tetrahedrite-(Zn) ()*	Tetrahedrite	Cu₆(Cu₄Zn₂)Sb₄S₁₃			1	228972	5317
Thomsonite-Ca ()*	Thomsonite	NaCa₂(Al₅Si₅)O₂₀·6H₂O			1	228970	452
Thorite ()*	Zircon	Th(SiO₄)			1	228973	1006
Titanite ()*	Titanite	CaTi(SiO₄)O			2	228970,228973	4899
Whewellite ()*	Oxalate	Ca(C₂O₄)·H₂O	83.6	72.1	1	228974	66
Zircon ()*	Zircon	Zr(SiO₄)			2	228973,228978	5251

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Michelle_574	Whewellite, calcium oxalate monohydrate, has been found as a crystal perched on terminated' unetched, drusy calcite crystals in a septarian limestone concretion in the marine Bearpaw shale of late cretaceous age near Havre, Montana.

5 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Num	Minerals explicitely stated as having this age	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference ID	Age Notes
Michelle_574	83.6	72.1	Campanian	stratigraphy	Age of Bearpaw Shale	high		Whewellite	30928	Havre, Hill Co., Montana, USA	Havre	Pecora and Kerr (1954)	AM39_208	Age of Bearpaw Shale, containing the limestone concretions in which whewellite has been found.
NAVDAT-30343	54	42	48±6				30343		163603	Nepheline Occurrences, Hill Co., Montana, USA		NAVDAT	NAVDAT
NAVDAT-30378	54	42	48±6				30378		163603	Nepheline Occurrences, Hill Co., Montana, USA		NAVDAT	NAVDAT
NAVDAT-29747	56.6	48.4	52.5±4.1				29747		164302	Rocky Boy Stock Occurrence, Hill Co., Montana, USA		NAVDAT	NAVDAT
NAVDAT-30377	54	42	48±6				30377		164302	Rocky Boy Stock Occurrence, Hill Co., Montana, USA		NAVDAT	NAVDAT

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...