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 Holmquistite at Rwanda

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 935.4Ma - 923.4Ma 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
Alexandra-0243	935.4	923.4	Columbite-(Mn)		Ta,Nb	57927	Kibingo Pegmatite (Kibinga [relating To A Hill]; Lemera; Mwaka), Gitarama – Kibuye Road, Southern Province, Rwanda	Melcher et al. (2015)	OGR64_667

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-0165	950	922				2824	Buranga Pegmatite, Gatumba, Ngororero District, Western Province, Rwanda	Dewaele et al. (2011)	JAES61_10
Alexandra-0166	975	930				221139	Gatumba Pegmatite, Gatumba, Ngororero District, Western Province, Rwanda	Dewaele et al. (2011)	JAES61_10
Alexandra-0167	974.7	957.3				210669	Bijyojyo, Western Province, Rwanda	Dewaele et al. (2011)	JAES61_10
Alexandra-0234	932.3	929.9	Columbite-(Fe)		Ta,Nb	243295	Rongi Amblygonite Pegmatite, Gatumba, Ngororero District, Western Province, Rwanda	Melcher et al. (2015)	OGR64_667
Alexandra-0243	935.4	923.4	Columbite-(Mn)		Ta,Nb	57927	Kibingo Pegmatite (Kibinga [relating To A Hill]; Lemera; Mwaka), Gitarama – Kibuye Road, Southern Province, Rwanda	Melcher et al. (2015)	OGR64_667
Grew_Li_2019_0007	980	980		Bertossaite		58310	Rubindi Pegmatite (Kabilizi), Gatumba, Ngororero District, Western Province, Rwanda	Hulsbosch et al. (2013, 2014)	GB16_105, GCA132_349