ABSTRACT
A)<extensivelinestructureonprismfacesofberylcrystalshasbeen revealedbymicroscopicobservation.Evidenceisgivenbelowtoshow thattheselines:representstepsonlyoneunitcellinheight;ifthisis thecasetheheightofthestepshouldbe9·17AXcosHO=7·9A).
A)<extensivelinestructureonprismfacesofberylcrystalshasbeen revealedbymicroscopicobservation.Evidenceisgivenbelowtoshow thattheselines:representstepsonlyoneunitcellinheight;ifthisis thecasetheheightofthestepshouldbe9·17AXcosHO=7·9A).