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Herdérite

Herdérite
  • Translations : Herderite, Allogonit, Glucinit, Herderita, Гердерит, 磷铍钙石, ヘルデライト
  • Synonym : Allogonite, Glucinite
  • Etymology : Gem dedicated to Baron Siegmund A.W. VON HERDER, officer of the mines of Freiberg (1776-1838 ) in Germany. Discovered in 1828 in Ehrenfriedersdorf, Saxony, Germany.
  • Discovery: 1828 by Wilhelm Haidinger
  • Type localitySauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxe, Germany

For more information on Herderite mineralogy, see Mindat.org->

Gemological data

  • Chemical formula : CaBePO4(F,OH)
  • Hardness (Mohs) : 5 - 5.5
  • Density : 2.95 - 3.01
  • Refractive index : nα = 1.556 - 1.592 nβ = 1.578 - 1.610 nγ = 1.589 - 1.620
  • Birefingence : 1.59 - 1.62
  • Crystal system : Monoclinic
  • Group : Gadolinite
  • Mineralogical Class : Phosphates

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