When a cleavage flake of mica is struck a sharp blow with a blunt needle-point a six-rayed star of cracks or percussion figure is developed: the rays intersect at angles of approximately 60°, and the pair most prominently developed are parallel to the plane of symmetry of the crystal.
Rayed הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד