Growing twins were revealed in lithium tetraborate single crystals. Th
e twinning takes place according to Dauphine rule with twinning axes [
1 0 0] and [0 1 0]. The regularity of twin's creation is explained by
means of crystal lattice. The effect of twinning on physical propertie
s of TBL is discussed. (C) 1998 Elsevier Science B.V. All rights reser
ved.