Specimens Beryllonite is a rare beryllium mineral. It is found at only a few places around the world. It can be cut as gems, but lacks color, fire and hardness to be a popular gemstone. The first and some of the best specimens of beryllonite have come from McKean Mt., Stoneham, Maine. It forms from pegmatitic dikes and can be easily confused with more common pegmatite minerals.
Color is colorless, white to pale yellow.
Luster is vitreous. Fracture is conchoidal. Streak is white. Associated Minerals include quartz especially rose quartz , feldspars especially a variety of albite called cleavelandite , elbaite , beryl and columbite . Best Field Indicators are crystal habit, color, hardness and locality.