armenite

plural armenites

1. chemistryAn orthorhombic-pyramidal mineral containing aluminum, barium, calcium, hydrogen, oxygen, and silicon.

   All reported armenites are of nearly end-member composition.

   2003, Hetherington, Callum J., et al., “Formation of armenite in the Berisal Complex, Simplon Region, Switzerland.”, in Swiss Bulletin of Mineralogy and Petrology, volume 83, number 3, page 243

   2 more examples

   Pure armenite is colorless and has well developed prismatic pseudohexagonal crystals with poorly developed terminal faces.

   1939 June 17, Henrich Neumann, “Armenite, a new mineral”, in Norsk Geologisk Tidsskrift, volume 19, page 312

   Although armenite contains 10 inequivalent Si-positions, only the topochemically distinct Si sites are resolved in the NMR spectrum.

   2012, Robin K. Harris, NMR Crystallography