mineral

Beryllonite

Beryllonite (NaBePO4)

Hardness: 5.5—6 on Mohs scale; Color: Colorless, white, or pale yellow; Luster: Vitreous to pearly; Crystal Structure: Monoclinic (pseudo-orthorhombic); Cleavage: Perfect on {010}, good on {100}; Specific Gravity: 2.80—2.85.

Hardness: 5
Color: Colorless, white, or pale yellow
Luster: Vitreous to pearly

Identified May 18, 2026More mineral →

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Physical properties

Formation & geological history

Beryllonite is a rare sodium beryllium phosphate mineral. It typically forms in granitic pegmatites and is associated with other minerals like quartz, feldspar, and triphylite. It was first described based on specimens from Stoneham, Maine, found in the late 19th century.

Uses & applications

Primarily of interest as a collector's mineral specimen. Due to its relative scarcity and fragility (perfect cleavage), it is rarely used in mainstream jewelry, though it is sometimes faceted for gemstone enthusiasts.

Geological facts

It was first discovered in 1888. Though it crystallizes in the monoclinic system, its crystals often appear orthorhombic due to complex twinning. It is sometimes confused with quartz or colorless beryl because of its appearance.

Field identification & locations

Identified in the field by its distinct crystal form and pearly luster on cleavage surfaces. It is most commonly found in Maine, USA, and Minas Gerais, Brazil. Collectors should look for its tabular or prismatic habits in lithium-rich pegmatites.