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 Superior District, Pinal Co., Arizona, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 20.3Ma - 17.3Ma at this locality

Age range from children

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
Giersdorf_00000427	20.3	17.3				52658	Picketpost Mountain, Superior, Superior District, Pinal Co., Arizona, USA	Shafiqullah et al. (1980)	AGSD12_201

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
Giersdorf_00000426	18.9	17.9				52658	Picketpost Mountain, Superior, Superior District, Pinal Co., Arizona, USA	Shafiqullah et al. (1980)	AGSD12_201
Giersdorf_00000427	20.3	17.3				52658	Picketpost Mountain, Superior, Superior District, Pinal Co., Arizona, USA	Shafiqullah et al. (1980)	AGSD12_201