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:
Isle Royale National Park, Lake Superior, Keweenaw Co., Michigan, USA

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

mindat Locality ID: 3846
mindat URL: http://www.mindat.org/loc-3846.html

Tectonic Settings:

Total number of sublocalities beneath "Isle Royale National Park, Lake Superior, Keweenaw Co., Michigan, USA": 27
Total number of bottom-level sublocalities: 27

Number of Child Localities: 27
Child Localities:
Agate Beach
Caribou Island
Carnelian Beach
Chicago & Isle Royale Mine
Conglomerate Bay
Datolite Mine
Epidote Lake
Epidote Mine
Haytown Mine (Pittsburg & Isle Royale Mine)
Island Mine
Lucky Bay Mine
McGinty Cove
Minong Mine
Mott Island
Ohio & Isle Royale Mine
Saginaw Mine
Scoville Mine
Senter Point
Siskiwit Bay
Siskiwit Lake
Siskowit Mine
Smithwick Island
Smithwick Mine
Thomsonite Beach
Tobin Harbor
Unnamed Locality
Wendigo Mine

Latitude: 48°0'55"N
Longitude: 88°47'38"W
Decimal Degree (lat, lon): 48.015277777778,-88.793888888889

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.

Calcite	Clinozoisite	Copper	Epidote	Gadolinite	Natrolite	None	Prehnite	Pumpellyite	Quartz

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 C Ca Cu Fe H Mg Na O Si

Elements from minerals reported directly at this locality: Al Ca H Na O Si

Structural Groups for minerals in this locality:
Calcite Clinozoisite Copper Epidote Gadolinite Natrolite None Prehnite Pumpellyite Quartz

9 IMA Minerals at location:

Calcite ()*	Copper ()*	Datolite ()*	Epidote ()*	Mesolite ()*
Prehnite ()*	Pumpellyite-(Mg) ()*	Quartz ()*	Xonotlite ()*

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
Calcite ()*	Calcite	Ca(CO₃)	1060	1047	1	221903	27770
Copper ()*	Copper	Cu	1060	1047	8	221899,221901,221902,221903,221906,221909,221914,221920	3846
Datolite ()*	Gadolinite	CaB(SiO₄)(OH)	1060	1047	4	221901,221905,221917,221919	498
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	1060	1047	1	221900	8173
Mesolite ()*	Natrolite	Na₂Ca₂(Si₉Al₆)O₃₀·8H₂O	1060	1047	0		425
Prehnite ()*	Prehnite	Ca₂Al(Si₃Al)O₁₀(OH)₂	1060	1047	1	221917	1898
Pumpellyite-(Mg) ()*	Pumpellyite	Ca₂MgAl₂(Si₂O₇)(SiO₄)(OH)₂·H₂O	1060	1047	4	221901,221907,221913,221915	106
Quartz ()*	Quartz	SiO₂	1060	1047	9	221894,221895,221896,221898,221903,221907,221911,221912,221918	61156
Xonotlite ()*	None	Ca₆Si₆O₁₇(OH)₂	1060	1047	0		109

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
R070130	Isle Royale National Park, Lake Superior, Keweenaw Co., Michigan, USA	https://rruff.info/R070130

All locality data graciously provided by mindat.org

All age data...