Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org

Ages for Almandine at Etta Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 1640Ma - 1640Ma at this locality

Locality age

Excel ID	Max Age (Ma)	Min Age (Ma)	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	Dated Locality ID	Dated Locality	Ref	Ref ID
Alexandra-0270	1640	1640	Muscovite			4106	Etta Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA	Riley (1970)	GCA34_713