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:
Back Forty Deposit, Menominee Co., Michigan, USA

Oldest recorded age at locality: 1800
Youngest recorded age at locality: 1800

mindat Locality ID: 221750
mindat URL: http://www.mindat.org/loc-221750.html

Tectonic Settings: Continental Arc

Total number of sublocalities beneath "Back Forty Deposit, Menominee Co., Michigan, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 45°27'9"N
Longitude: 87°49'50"W
Decimal Degree (lat, lon): 45.4525,-87.830555555556

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.

Acanthite	Arsenopyrite	Chalcopyrite	Clay	Copper	Corundum	Diaspore	Lillianite	Meneghinite	Mica
Nickeline	None	Perovskite	Pyrite	Quartz	Rocksalt	Rutile	Skutterudite	Sphalerite	Spinel

Acanthite ()*	Arsenopyrite ()*	Bornite ()*	Cassiterite ()*	Chalcopyrite ()*
Clausthalite ()*	Diaphorite ()*	Eugenite ()*	Galena ()*	Goethite ()*
Gold ()*	Hematite ()*	Luanheite ()*	Magnetite ()*	Meneghinite ()*
Muscovite ()*	Nickelskutterudite ()*	Pyrite ()*	Pyrrhotite ()*	Quartz ()*
Ramdohrite ()*	Silver ()*	Skutterudite ()*	Sphalerite ()*

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 As Au Cd Co Cu Fe H Hg K Ni O Pb S Sb Se Si Sn Zn

Elements from minerals reported directly at this locality: Ag Al As Au Cd Co Cu Fe H Hg In K Mn Ni O Pb S Sb Se Si Sn Zn

Structural Groups for minerals in this locality:
Acanthite Arsenopyrite Chalcopyrite Clay Copper Corundum Diaspore Lillianite Meneghinite Mica
Nickeline None Perovskite Pyrite Quartz Rocksalt Rutile Skutterudite Sphalerite Spinel

24 IMA Minerals at location:

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Acanthite ()*	Acanthite	Ag₂S	1800	1800	2793
Arsenopyrite ()*	Arsenopyrite	FeAsS	1800	1800	9052
Bornite ()*	None	Cu₅FeS₄	1800	1800	5516
Cassiterite ()*	Rutile	SnO₂	1800	1800	5171
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	1800	1800	27198
Clausthalite ()*	Rocksalt	PbSe	1800	1800	281
Diaphorite ()*	None	Ag₃Pb₂Sb₃S₈	1800	1800	126
Eugenite ()*	None	Ag₁₁Hg₂	1800	1800	17
Galena ()*	Rocksalt	PbS	1800	1800	24243
Goethite ()*	Diaspore	FeO(OH)	1800	1800	7437
Gold ()*	Copper	Au	1800	1800	30554
Hematite ()*	Corundum	Fe₂O₃	1800	1800	14640
Luanheite ()*	None	Ag₃Hg	1800	1800	17
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	1800	1800	14899
Meneghinite ()*	Meneghinite	Pb₁₃CuSb₇S₂₄	1800	1800	158
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	1800	1800	17380
Nickelskutterudite ()*	Skutterudite Perovskite	(Ni,Co,Fe)As₃	1800	1800	176
Pyrite ()*	Pyrite	FeS₂	1800	1800	39462
Pyrrhotite ()*	Nickeline	Fe₇S₈	1800	1800	9056
Quartz ()*	Quartz	SiO₂	1800	1800	61156
Ramdohrite ()*	Lillianite	Pb_5.9Fe_0.1Mn_0.1In_0.1Cd_0.2Ag_2.8Sb_10.8S₂₄	1800	1800	34
Silver ()*	Copper	Ag	1800	1800	5186
Skutterudite ()*	Skutterudite Perovskite	CoAs₃	1800	1800	531
Sphalerite ()*	Sphalerite	ZnS	1800	1800	21482

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
	vms-01063	1800	1800	Proterozoic										S	221750	Back Forty Deposit, Menominee Co., Michigan, USA	Back Forty	Moiser et al. (2009)		USGSOFR2009_1034

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...