A terminated example of phenacite from the Anjanabonoina pegmatites, approximately 3 days walk from the nearest village (Ambohimanambola) and even reaching that village in a 4x4 from the highway is quite a crazy ride....  This pegmatite is better known for producing the material that is turned into the highest quality tourmaline slices. This is a reasonably large crystal for the locality, most are usually well under 1.5 cm.