Formula: NaBePO₄

Species: Phosphates

Colour: Colourless, white, rarely pale light yellow; colourless in transmitted light.

Lustre: Sub-Vitreous, Resinous, Waxy, Greasy

Hardness: 5½ – 6

Specific Gravity: 2.77 – 2.85

Crystal System: Monoclinic,

Name: Named by Edward S. Dana in 1888 in allusion to its composition, containing beryllium.

Co-Type Localities: Beryllonite Locality (Mcallister Occurrence), Stoneham, Oxford County, Maine 6 USA.
Joe McKeen Mountain locality (McKean Farm), Stoneham, Oxford County, Maine – USA