be·ryl·lo·nite
| \ bə-ˈri-lə-ˌnīt \
plural -s
Definition of beryllonite
: a mineral NaBePO4 consisting of sodium beryllium phosphate occurring in light-colored topazlike orthorhombic crystals (hardness 5.5–6, specific gravity 2.85)
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Merriam-Webster unabridged
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