Chemical composition -- An oxide of aluminum and boron with fluorine and hydroxyl.
Color -- Colorless to pale blue-green or yellow-brown.
Optics -- R.I 1.64-1.65.
Durability -- Hardness 6.5-7.5.
Crystal structure -- Hexagonal.
Specific Gravity -- 3.28-3.31.
Sources -- Namibia is almost the only source of this rare gemstone. Jeremejevite is an extremely rare collector stone.