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Beryllonite

Beryllonite
  • Translations : Beryllonit, Beryllonita, ベリロナイト, Бериллонит, 磷钠铍石
  • Etymology : Because beryllium is part of its chemical composition.
  • Discovery: 1888 by Dana
  • Type localityMt. Mckean, Stoneham, Oxford co., Maine, USA.

To learn more about the mineralogy of the Beryllonite, see mindat.org.

Gemological data

  • Chemical formula : Na Be PO4
  • Hardness (Mohs) : 5.5 - 6
  • Density : 2.77 - 2.85
  • Refractive index : nα = 1.552 nβ = 1.558 nγ = 1.561
  • Birefingence : 0.009
  • Crystal system : Monoclinic
  • Group : Phosphates

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