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Beryllonite color stone basic properties table

Name Origin In allusion to the composition
Chemical Formula NaBePO4
Color Colorless, white, pale yellow
Fracture Conchoidal, Brittle
Hardness 5.5 - 6 on the Mohs scale
Crystal System Monoclinic. Crystals tabular or prismatic, usually etched. twinning common
Cleavage Perfect 1 direction, good 1 direction
inclusions Hollow canals and fluid cavities arranged parallel to crystal axis
Specific Gravity (SG) 2.84
Lustre Vitreous; pearly on cleavage
Pleochroism None
Note: Beryllonite is really not suited for wear, and since it is only available as small colorless stone, there is not much incentive to make jewellery out of it. However, Beryllonite is one of the truly rare collector gems and should be greatly prized as a cut stone. The cleavage makes Beryllonite hard to cut.