By E A Wood
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Additional resources for Crystals: a handbook for schoolteachers ; written for the Commission on Crystallographic Teaching of the International Union of Crystallography
A half-melted bit of ice may show no boundaries in regular light, but between crossed polarizers, you may find that part of it is dark in one position and the other D Experiments with Polarized Light 33 part is dark in another position. Clearly, in such a case, it consists of two crystals. 3 Ice and mica In the section on ice, an interference figure was described, a black cross on a gray background, that could be seen under favorable conditions. It is not easy to see. One needs a rather thick piece of ice, with smooth surfaces, and an area that looks black in all orientations when the ice sheet is parallel to the plane of the polarizers.
They oscillate from side to side in all directions that are at right angles to the direction in which the light is traveling. However, it is possible to pass the light through something that will only let through light that is oscillating in one particular plane. Light oscillating in one plane only is called plane polarized light, or often simply polarized light. The thing causing the polarization of the light is called a polarizer. There are several kinds of polarizers. Every smooth, non-metallic, surface that reflects light partially polarizes it.
When limestone is metamorphosed, marble results. The calcite crystals become larger, some growing at the expense of others. Metamorphism of shale produces slate. Further metamorphism of slate produces schist, a rock full of mica that glistens in the sunlight. 4. Boulders, pebbles, and sand. If you live where you do not see any big rock masses exposed for you to study, pick up any small bits that you can find. Often they are dirty on the outside, and sometimes their surfaces have been changed by the weather.