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:
Central, Keweenaw Co., Michigan, USA

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

mindat Locality ID: 24836
mindat URL: http://www.mindat.org/loc-24836.html

Tectonic Settings:

Total number of sublocalities beneath "Central, Keweenaw Co., Michigan, USA": 6
Total number of bottom-level sublocalities: 6

Number of Child Localities: 6
Child Localities:
Central Exploration Mine
Central Mine
Dana Mine
Madison Mine
Northwestern Mine
Winthrop Mine

Latitude: 47°24'27"N
Longitude: 88°11'16"W
Decimal Degree (lat, lon): 47.4075,-88.187777777778

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	Analcime	Apophyllite	Calcite	Clay	Clinozoisite	Copper	Corundum	Epidote	Feldspar
Gadolinite	Mica	Natrolite	None	Not in a structural group	Prehnite	Pumpellyite	Quartz	Smectite-vermiculite	Thomsonite

Analcime ()*	Calcite ()*	Chalcocite ()*	Chrysocolla ()*	Copper ()*
Cuprite ()*	Datolite ()*	Epidote ()*	Fluorapophyllite-(K) ()*	Hematite ()*
Ilmenite ()*	Laumontite ()*	Microcline ()*	Muscovite ()*	Natrolite ()*
Prehnite ()*	Pumpellyite-(Mg) ()*	Quartz ()*	Saponite ()*	Silver ()*
Tenorite ()*	Thomsonite-Ca ()*

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 B C Ca Cu F Fe H K Mg Na O S Si Ti

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Allophane Analcime Apophyllite Calcite Clay Clinozoisite Copper Corundum Epidote Feldspar
Gadolinite Mica Natrolite None Not in a structural group Prehnite Pumpellyite Quartz Smectite-vermiculite Thomsonite

22 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
Analcime ()*	Analcime	Na(AlSi₂O₆)·H₂O	1060	1047	2	221786,221789	1627
Calcite ()*	Calcite	Ca(CO₃)	1060	1047	3	221785,221786,221789	27770
Chalcocite ()*	None	Cu₂S	1060	1047	1	221789	5707
Chrysocolla ()*	Allophane	(Cu_2-xAl_x)H_2-xSi₂O₅(OH)₄·nH₂O	1060	1047	1	221789	3531
Copper ()*	Copper	Cu	1060	1047	6	221785,221786,221787,221788,221789,221790	3846
Cuprite ()*	Not in a structural group	Cu₂O	1060	1047	1	221786	2970
Datolite ()*	Gadolinite	CaB(SiO₄)(OH)	1060	1047	4	221785,221786,221787,221789	498
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	1060	1047	1	221786	8173
Fluorapophyllite-(K) ()*	Apophyllite	KCa₄Si₈O₂₀F·8H₂O	1060	1047	1	221786	303
Hematite ()*	Corundum	Fe₂O₃	1060	1047	1	221786	14640
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃	1060	1047	1	221786	5433
Laumontite ()*	Not in a structural group	CaAl₂Si₄O₁₂·4H₂O	1060	1047	1	221786	1271
Microcline ()*	Feldspar	K(AlSi₃O₈)	1060	1047	1	221789	4924
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	1060	1047	1	221786	17380
Natrolite ()*	Natrolite	Na₂(Si₃Al₂)O₁₀·2H₂O	1060	1047	1	221786	1236
Prehnite ()*	Prehnite	Ca₂Al(Si₃Al)O₁₀(OH)₂	1060	1047	2	221786,221789	1898
Pumpellyite-(Mg) ()*	Pumpellyite	Ca₂MgAl₂(Si₂O₇)(SiO₄)(OH)₂·H₂O	1060	1047	3	221785,221786,221789	106
Quartz ()*	Quartz	SiO₂	1060	1047	2	221786,221789	61156
Saponite ()*	Clay Smectite-vermiculite	(Ca,Na)_0.3(Mg,Fe)₃(Si,Al)₄O₁₀(OH)₂·4H₂O	1060	1047	1	221789	301
Silver ()*	Copper	Ag	1060	1047	3	221785,221786,221789	5186
Tenorite ()*	None	CuO	1060	1047	1	221786	1101
Thomsonite-Ca ()*	Thomsonite	NaCa₂(Al₅Si₅)O₂₀·6H₂O	1060	1047	1	221786	452

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...