Høgtuvaite

*from Bordvedaga, Hogtuva, Rana, Nordland, Norway.
*100 x 60 x 18 mm overall.

Type and Only location for this really rare beryllium mineral. It's chemical composition is 
Ca₄[Fe²⁺₆Fe³⁺₆]O₄[Si₈Be₂Al₂O₃₆]. The largest crystal is 15 mm long.