Ahlfeldite

Ahlfeldite ((Ni, Co)SeO₃]·2H₂O) is a mineral of secondary origin. It is named after Friedrich Ahlfeld (1892–1982), a German-Bolivian mining engineer and geologist. Its type locality is Virgen de Surumi mine, Pakajake Canyon, Chayanta Province, Potosí Department, Bolivia.

Ahlfeldite
Alfredopetrovite, Ahlfeldite, Chalcomenite
General
Category	Selenite mineral
Formula	(Ni,Co)SeO3·2H2O
IMA symbol	Afe[1]
Strunz classification	4.JH.10
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) (same H-M symbol)
Space group	P21/m
Identification
References	[2][3][4]