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Determination and refinement of the crystal structures of väyrynenite and euclase show that these minerals have related, but not identical, structures. Väyrynenite contains chains of BeO 2 (OH) 2  and PO 4  tetrahedra linked by Mn-O and hydrogen bonds; euclase contains chains of BeO 3 (OH) and SiO 4  tetrahedra linked by Al-O bonds. The differences between the two structures are due principally to the difference in electrostatic charge distribution between a structure containing Mn and P and a structure containing Al and Si.

The crystal structures and crystal chemistry of väyrynenite, (Mn,Fe)Be(PO 4 )(OH), and euclase, AlBe (SiO 4 )(OH)*