Note that the Orientation Slice is cut precisely to the (100) before the crystal is rotated and cut at either +.25 degrees and toward the flat, or â.25 degrees and away from the flat (as described in Figure 3).
The era was called the Dark Ages also because we don't have a lot of written sources from that time period, especially from the early part of the dark ages (500 to 800 CE).
Why are the early Middle Ages sometimes referred to as the Dark Ages?. In the early Middle Ages, Europe was in chaos. But in the late Middle Ages the modern nations of France and England was born and Europe became the dominant region of the world. Civilization returned.