Wegscheiderite
Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia
Needle-like or maybe lath-like (or somewhat bladed) crystals of wegscheiderite - rare anhydrous sodium bicarbonate carbonate. Such minerals, though typical for lake-evaporative environments (like at the type locality/localities at Green River Formation), may also form in expense of extremely sodic otherwise Ti- and/or Zr-bearing silicates typical ...
© Ł Kruszewski 2020