Beryllonite Value, Price, and Jewelry Information


BERYLLONITE: Maine (~ 2, rough, 1 inch across). Photo © Joel E. Arem, PhD, FGA. Used with permission.

Beryllonite is really not suited for wear, and since it is available only as small colorless stones, there is not much incentive to make jewelry 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 gems hard to cut.

Beryllonite Value

The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

Beryllonite Information

DataValue
NameBeryllonite
Crystallography Monoclinic. Crystals tabular or prismatic, usually etched. Twinning common. May be pseudo-orthorhombic.
Colors Colorless, white, pale yellow.
Luster Vitreous; pearly on cleavage.
Fracture Conchoidal. Brittle.
Hardness 5.5-6
Specific Gravity 2.84 (pure); usually 2.80-2.85.
Birefringence 0.009
Cleavage Perfect 1 direction, good 1 direction.
Dispersion 0.010
Stone SizesAll gems less than 5 carats. The mineral itself is very rare, and gems are only known from Maine localities. Stones up to 10 carats have been cut, but they are not clean. Smithsonian Institution (Washington, D.C): 2.5, 3.3, 3.9, 5.10 (all Maine) Devonian Group (Calgary, Alberta, Canada): 5.70 (colorless Maine) Private Collection: 7.82, 8.77, 4.32 (colorless, Maine) Harvard University: 6.22 (colorless, Maine?)
Luminescence None
Spectral Not diagnostic.
FormulaNaBePO4
Pleochroism None

OPTICS: α= 1.552; β = 1.558; γ = 1.561

Biaxial (-), 2V = 68°

INCLUSIONS: Hollow canals and fluid cavities arranged parallel to crystal axis. Material from Stoneham, Maine, has tubes, gas bubbles and acicular crystals.

OCCURRENCE: Granite pegmatites.

Newry, Maine: opaque white crystals, not really possible to cut.

Stoneham, Maine: only cuttable crystals ever found; also crystalline masses up to 1-2 inches, but only small clean areas within such masses could be cut.

COMMENTS: Beryllonite is really not suited for wear, and since it is available only as small colorless stones, there is not much incentive to make jewelry 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 gems hard to cut.

NAME: In allusion to the composition.