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:
Mount Bohemia, Lac La Belle, Keweenaw Co., Michigan, USA

Oldest recorded age at locality: 1060
Youngest recorded age at locality: 1047

mindat Locality ID: 55679
mindat URL: http://www.mindat.org/loc-55679.html

Tectonic Settings:

Total number of sublocalities beneath "Mount Bohemia, Lac La Belle, Keweenaw Co., Michigan, USA": 2
Total number of bottom-level sublocalities: 2

Number of Child Localities: 2
Child Localities:
Mendota Mine
Mount Bohemia Mine

Latitude: 47°23'29"N
Longitude: 88°'46"W
Decimal Degree (lat, lon): 47.391388888889,-88.012777777778

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.

Allophane	Baryte	Calcite	Chalcopyrite	Clinozoisite	Copper	Corundum	Covellite	Digenite	Epidote
Feldspar	Malachite	None	Not in a structural group	Pyrite	Pyroxene	Quartz	Rocksalt	Sphalerite	Spinel
Titanite

Albite ()*	Anorthite ()*	Augite ()*	Baryte ()*	Bornite ()*
Calcite ()*	Chalcocite ()*	Chalcopyrite ()*	Chrysocolla ()*	Copper ()*
Covellite ()*	Cuprite ()*	Digenite ()*	Djurleite ()*	Epidote ()*
Galena ()*	Hematite ()*	Laumontite ()*	Magnetite ()*	Malachite ()*
Pyrite ()*	Quartz ()*	Silver ()*	Sphalerite ()*	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: Ag Al Ba C Ca Cu Fe H Mg Na O Pb S Si Ti Zn

Elements from minerals reported directly at this locality: Ag Al Ca Fe Mg O Si

Structural Groups for minerals in this locality:
Allophane Baryte Calcite Chalcopyrite Clinozoisite Copper Corundum Covellite Digenite Epidote
Feldspar Malachite None Not in a structural group Pyrite Pyroxene Quartz Rocksalt Sphalerite Spinel
Titanite

25 IMA Minerals at location:

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)	1060	1047	2	221883,221884	8803
Anorthite ()*	Feldspar	Ca(Al₂Si₂O₈)	1060	1047	0		1036
Augite ()*	Pyroxene	(Ca,Mg,Fe)₂Si₂O₆	1060	1047	0		2060
Baryte ()*	Baryte	Ba(SO₄)	1060	1047	1	221884	11547
Bornite ()*	None	Cu₅FeS₄	1060	1047	2	221883,221884	5516
Calcite ()*	Calcite	Ca(CO₃)	1060	1047	1	221883	27770
Chalcocite ()*	None	Cu₂S	1060	1047	2	221883,221884	5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	1060	1047	2	221883,221884	27198
Chrysocolla ()*	Allophane	(Cu_2-xAl_x)H_2-xSi₂O₅(OH)₄·nH₂O	1060	1047	1	221883	3531
Copper ()*	Copper	Cu	1060	1047	1	221883	3846
Covellite ()*	Covellite	CuS	1060	1047	1	221884	4165
Cuprite ()*	Not in a structural group	Cu₂O	1060	1047	1	221884	2970
Digenite ()*	Digenite	Cu_1.8S	1060	1047	1	221884	1027
Djurleite ()*	None	Cu₃₁S₁₆	1060	1047	1	221884	300
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	1060	1047	1	221884	8173
Galena ()*	Rocksalt	PbS	1060	1047	1	221884	24243
Hematite ()*	Corundum	Fe₂O₃	1060	1047	1	221884	14640
Laumontite ()*	Not in a structural group	CaAl₂Si₄O₁₂·4H₂O	1060	1047	1	221884	1271
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	1060	1047	1	221884	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂	1060	1047	1	221883	12537
Pyrite ()*	Pyrite	FeS₂	1060	1047	1	221884	39462
Quartz ()*	Quartz	SiO₂	1060	1047	1	221884	61156
Silver ()*	Copper	Ag	1060	1047	0		5186
Sphalerite ()*	Sphalerite	ZnS	1060	1047	1	221884	21482
Titanite ()*	Titanite	CaTi(SiO₄)O	1060	1047	1	221884	4899

1 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
	Mo-00057	1060	1047		Rb-Sr						Yes		Kamiokite	Mo	3847	Keweenaw Co., Michigan, USA		Bornhorst et al. (1988)	10.2113/gsecongeo.83.3.619	EG83_619

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...