repeated twinning
Written by Administrator   
Monday, 29 October 2007

repeated twinning. Three or more crystals united according to the same crystallographic law, with the twin­ning planes parallel. See polysynthetic

TWINNING, KNOT LINES, TWINNING LINES.

Replique. Trade name for man-made yttrium aluminum garnet (YAG). resistivity. The electrical resistance offered to the passage of an electrical current. Usually expressed in ohm meters. Type I and lla stones are gen­erally classed as good insulators, i.e., good resistors to electricity. In con­trast, Type lib stones are semi­conductors of electricity.