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 Annite at Groton, Grafton Co., New Hampshire, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of Ma - Ma 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-0181	326	294	Zircon			3942	Palermo No. 1 Mine (Palermo No. 1 Pegmatite; Hartford Mine; GE Mine), Groton, Grafton Co., New Hampshire, USA	Bradley et al. (2016)	CM54_945
Alexandra-0411	339	319	Muscovite			6343	Fletcher Mine, Groton, Grafton Co., New Hampshire, USA	Zartman et al. (1970)	GSAB81_3359