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 Opal at Great Western Mine (Laguna Western; Black Bart Mine; Tucker Lease), Great Western-Mirabel Group, Middletown, East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Lake Co., California, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 164Ma - 164Ma 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
podchrome-00323	164	164			Cr	80774	Great Western Mine (Laguna Western; Black Bart Mine; Tucker Lease), Great Western-Mirabel Group, Middletown, East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Lake Co., California, USA	Moiser et al. (2012)	USGSSIR2012_5157

Locality age (remote)

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
Hg-00110	2.9	0		Cinnabar, Mercury, Metacinnabar, Schuetteite, Tiemannite	Hg	80795	East Mayacmas District, Mayacmas Mts (Mayacamas Mts), Lake Co., California, USA	Smith et al. (2008)	EPSL269_399