Striations

These extremely precisely milled striations are also only just under one millimeter in depth.

Czochralski or pulled alexandrite is easier to identify because it is very clean and contains curved striations visible under magnification.

Evidence of past glaciers are visible throughout the park in the form of glacial erratics (large boulders dropped by the receding glacier) and north-south glacial striations visible on stone outcroppings.

Prisms faces often have heavy vertical striations that produce a rounded triangular effect.

Smooth muscle has no striations when examined microscopically.